Chapter 29.44
TRAFFIC SIGNALS AND CONSTRUCTION ZONES

Sections:

Article I. Generally

29.44.010    Installation/relocation of traffic signals.

29.44.020    Signal design plans.

29.44.030    Easements.

29.44.040    Traffic control plans for construction zones.

29.44.050    Signal design plans.

Article II. Traffic Signal Specifications

29.44.060    General requirements.

29.44.070    Traffic control and street closure.

29.44.080    Testing.

29.44.090    Intersection power.

29.44.100    Equipment salvage.

29.44.110    Existing traffic signals.

29.44.120    Signal heads.

29.44.130    Field location.

29.44.140    Utilities.

29.44.150    Notification of work.

29.44.160    Regulations and code.

29.44.170    Equipment list and drawings.

29.44.180    Excavating and backfilling.

29.44.190    Removing and replacing improvements.

29.44.200    Instructions and wiring diagrams.

29.44.210    Guarantee.

29.44.220    Underground facilities – Foundations.

29.44.230    Underground facilities – Conduit.

29.44.240    Underground facilities – Pull boxes.

29.44.250    Underground facilities – Detector loop wire installation.

29.44.260    Underground facilities – Conductor and cable.

29.44.270    Underground facilities – Bonding and grounding.

29.44.280    Underground facilities – Maintenance.

29.44.290    Underground facilities – Field testing.

29.44.300    Material specifications – Traffic signal indication unit specifications.

29.44.310    Material specifications – Pedestrian signal units.

29.44.320    Material specifications – Back plates.

29.44.330    Material specifications – Traffic signal lamps.

29.44.340    Electrical cable – Signal cable.

29.44.350    Electrical cable – Traffic wire specifications.

29.44.360    Electrical cable – Interconnect cable.

29.44.370    Electrical cable – Loop wire.

29.44.380    Electrical cable – Pedestrian push button cable.

29.44.390    Electrical cable – Loop lead in cable.

29.44.400    Electrical cable – Illuminated street name signs wire.

29.44.410    Electrical cable – Ground.

29.44.420    Electrical cable – Optical detector lead in cable.

29.44.430    Vehicle detectors – General.

29.44.440    Vehicle detectors – Vehicle video detection.

29.44.450    Vehicle detectors – Emergency vehicle detectors.

29.44.460    Pedestrian push button detectors – General.

29.44.470    Illuminated street name signs – General.

29.44.480    Traffic signal poles, pedestals and mastarms.

29.44.490    Controller cabinet – General.

29.44.500    Actuated controllers – General.

29.44.510    Actuated controllers – Coordination unit.

29.44.520    System telemetry.

29.44.530    On-street master – General.

29.44.540    Traffic signing and pavement markings.

29.44.550    Traffic control in construction areas – General.

29.44.560    Traffic control in construction areas – Time of submittal.

29.44.570    Traffic control in construction areas – Scope of construction traffic control plan.

29.44.580    Traffic control in construction areas – Elements of construction traffic control plan.

29.44.590    Traffic control in construction areas – Basis for construction traffic control plan.

29.44.600    Traffic control in construction areas – Restriction, regulations and opportunities.

29.44.610    Traffic control in construction areas – Approval.

29.44.620    Traffic control in construction areas – Modifications.

Article I. Generally

29.44.010 Installation/relocation of traffic signals.

New traffic signal installations and relocations of existing signal equipment may be required in the developer’s public improvement agreement. New signals will be installed only when warranted as specified in the MUTCD and when the new signal will not have a detrimental effect on the traffic flow. The need for a traffic signal will be addressed in the TIS and be designed in accordance with the criteria in GJMC 29.28.130.

The installation, modification or relocation of a traffic signal must follow the specifications defined in the Traffic Signal Specifications (Article II of this chapter).

(Res. 39-04 (§ 10.1), 4-21-04)

29.44.020 Signal design plans.

Signal design plans shall be submitted as part of the development plans. The design of the traffic signal shall follow the ITE Manual of Traffic Signal Design and the MUTCD standards. The signal design shall follow the signal specifications of the City.

Signal design plans shall contain all necessary information. Typical traffic signal installation and design details are included at the end of this chapter.

New signals or improvements to existing signals shall be required to install conduit for fiber optic cable and all necessary fiber optic equipment to connect to adjacent signals on streets as shown on the signal communications plan.

(Res. 39-04 (§ 10.2), 4-21-04)

29.44.030 Easements.

At proposed signalized private accesses, the first 50 feet of a private driveway approach as measured from the flowline of the cross street shall be dedicated as a permanent easement to provide for traffic signal loop detector placement and maintenance.

(Res. 39-04 (§ 10.3), 4-21-04)

29.44.040 Traffic control plans for construction zones.

All maintenance of traffic plans for construction areas shall be submitted to and approved as part of the permitting process for work in the public right-of-way. All plans shall conform to the MUTCD and be prepared by a certified traffic worksite supervisor. On State highways, the Colorado Department of Transportation shall approve work area traffic control signing and detour plans.

(Res. 39-04 (§ 10.4), 4-21-04)

29.44.050 Signal design plans.

Signal design plans shall contain all necessary information. Sample signal design drawings illustrating the proper information required are listed below:

(a)    Control Cabinet Foundation Detail, Pull Boxes, Pedestal Pole Installation, Pedestal Pole Footing.

(b)    Traffic Signal Pole Details.

(c)    Mastarm Assembly, Signal Face Detail, Conduit Detail, Phasing Sequence.

(d)    Loop Installation Detail.

(e)    Example of Typical Installation.

(Res. 39-04, 4-21-04)

Fiber Optic Project Detail (PDF)

Article II. Traffic Signal Specifications

29.44.060 General requirements.

The work specified in this article describes the installation of necessary material and equipment to complete traffic signals and/or other electrical systems as specified on the drawings, in the special contract provisions, or herein.

(Res. 39-04, 4-21-04)

29.44.070 Traffic control and street closure.

The contractor shall be required to maintain access to all private drives throughout the period of construction. The contractor shall be required to erect and maintain all barricades, traffic control signs, cones, and other traffic control items necessary to provide proper traffic control during construction. The contractor shall submit three copies of the traffic control plan to the City Transportation Engineer for approval 72 hours prior to beginning construction. At the completion of the project the contractor shall remove all barricades, traffic control signs, cones and other necessary construction traffic control items and return all areas or permanent traffic control devices damaged during construction to their original condition at no cost to the City. Traffic control signs and devices shall be in accordance with Part VI of the “Manual on Uniform Traffic Control Devices for Streets and Highways,” (MUTCD) Millennium Edition, dated June 14, 2001, published by the Federal Highway Administration, and as directed by the Engineer.

(Res. 39-04, 4-21-04)

29.44.080 Testing.

The City may at its option and cost retain the services of an independent testing lab to perform all testing consultation and to assist in the review of the work and equipment.

(Res. 39-04, 4-21-04)

29.44.090 Intersection power.

The contractor shall notify the engineer two weeks prior to the signal turn on so that orders may be issued for power connection to the intersection on the specified turn on date. Electrical power supply shall be separate from any other electrical service.

(Res. 39-04, 4-21-04)

29.44.100 Equipment salvage.

All traffic signal equipment that is removed shall remain the property of the City. Such property is to be removed from the work site and returned by the contractor to the City of Grand Junction located at 2551 River Road.

(Res. 39-04, 4-21-04)

29.44.110 Existing traffic signals.

When existing traffic signal installations are modified or completely rebuilt, the contractor shall avoid disturbing existing traffic signal equipment until the new or modified traffic signal system has been installed and put into operation. If the existing traffic signal equipment must be removed to accommodate the new construction, the contractor shall, with the engineer’s approval and at the contractor’s sole expense, install temporary overhead traffic signal equipment. The contractor shall at all times maintain a minimum of two three-section (red, yellow, and green) traffic signal heads for each roadway approach in conformance with the MUTCD.

(Res. 39-04, 4-21-04)

29.44.120 Signal heads.

Signal heads installed on standards or poles at new signal locations, which are not ready for actual electrical operation, shall be bagged. This shall include pedestrian heads and pedestrian push buttons.

(Res. 39-04, 4-21-04)

29.44.130 Field location.

All loops, poles, control cabinets, pull box locations, and pole foundations shall be field located by the engineer. Traffic signal poles and mastarms shall not be ordered until field verification of pole foundations is complete.

(Res. 39-04, 4-21-04)

29.44.140 Utilities.

All utilities shall be shown on the plans to the extent that they can, based upon utility records, surface field indications and proposed installations. During the progress of the work, all utility locations and elevations will necessarily require field verification in cooperation with the affected companies and public agencies. The contractor shall be responsible for locating all valve boxes, manholes, etc., and ensuring that they are properly protected and/or adjusted.

(Res. 39-04, 4-21-04)

29.44.150 Notification of work.

The contractor shall work only on weekdays between the hours of 8:00 a.m. and 5:00 p.m. The contractor must receive written approval from the engineer to work at any other time.

(Res. 39-04, 4-21-04)

29.44.160 Regulations and code.

All electrical equipment and material shall conform to the standards of the National Electrical Manufacturers Association (NEMA), Qwest Communications Company or the Colorado Department of Transportation, whichever is applicable. In addition to requirements of these specifications, the plans, the special contract provisions, all material, and work shall conform to the requirements of the National Electrical Code (hereinafter referred to as the “Code”), the Rules for Overhead Electrical Line Construction of the Public Utilities Commission, the Standards of the American Society for Testing Materials (ASTM), the American Standards Association (ASA), and any local ordinance which may apply. Wherever reference is made in these specifications or in the special contract provisions to the code, rules, or the standards mentioned above, the reference shall be construed to mean the code, rule, or standard that is in effect at the date of bidding.

(Res. 39-04, 4-21-04)

29.44.170 Equipment list and drawings.

The contractor shall submit a list of equipment and material that he proposes to furnish within five days of the execution of the owner-contractor agreement. The submittal shall include all equipment and material as identified on the plans or in the specifications by the manufacturer’s name which is necessary or customary in the trade to identify such equipment and material. The list shall be complete as to name of manufacturer, unit size, and material composition and shall be supplemented by such other data as may be required by the City Transportation Engineer.

The engineer or his designee prior to installation must make inspection or sampling of any materials, other than those already approved, according to the material specifications. If the contractor proposes a substitution of equipment called for in the plans or specifications, he shall provide additional information to prove the substitution item is of equal or superior quality. Any material and/or equipment installed by the contractor that is not in conformance with the City of Grand Junction specifications will be removed or changed at the contractor’s expense. Upon completion of the work, the contractor shall submit an “as built” or corrected plan showing, in detail, all construction changes including, but not limited to, wiring, cable, and location and depth of conduit.

(Res. 39-04, 4-21-04)

29.44.180 Excavating and backfilling.

Excavations for the installation of conduit, foundations, and other traffic signal items shall be performed in such a manner as to cause the least possible injury to the streets, sidewalks, and other improvements. Whenever possible, directional boring shall be used in place of trenching. The trenches shall not be excavated wider than necessary for the proper installation of the electrical appliances and foundations. Excavating shall not be performed until immediately before installation of conduit and other appliances. The material from the excavation shall be removed as the trenching progresses.

Trenches in existing or proposed roadways shall be backfilled with concrete or approved flow-fill material. After backfilling, all trenches shall be kept well filled and maintained in a smooth and well drained condition until permanent repairs are made.

Excavations in streets or highways shall be performed in such a manner that one lane of traffic in each direction shall be open to public traffic. All lane closures shall be approved by the engineer prior to closure. At the end of each day’s work and any other time construction operations are suspended, all construction equipment and other obstructions shall be removed from that portion of the roadway open for use by public traffic. When excavations must remain open overnight, they shall be properly marked to warn motorists and/or pedestrians according to guidelines established in the “Manual on Uniform Traffic Control Devices for Streets and Highways,” latest edition. The engineer may require the trench to be covered with steel plate so that the street remains open to traffic.

(Res. 39-04, 4-21-04)

29.44.190 Removing and replacing improvements.

The contractor shall at his sole expense replace or reconstruct sidewalks, curbs, gutters, rigid or flexible pavement, and any other City or privately owned property which is removed, broken, or damaged by him with material which conforms to current City standards and specifications. Whenever a part of a square or slab or existing concrete, sidewalk, or driveway is broken or damaged, the entire square or slab shall be removed and the concrete reconstructed as above specified.

The outline of all areas to be removed in Portland cement concrete sidewalks and in pavements shall be cut to a minimum depth of one and one-half inches with an abrasive type saw prior to removing the sidewalk and pavement material. Cut for remainder of the required depth may be made by a method satisfactory to the engineer. Cuts shall be neat and true with no shatter outside the removal area.

(Res. 39-04, 4-21-04)

29.44.200 Instructions and wiring diagrams.

All equipment shall be provided with three sets of complete installation instructions, including a complete chart of field connections as well as a manual for the controller, containing service instructions, wiring diagrams, trouble shooting procedures, etc. Each and every component used shall be clearly referenced in the service manual and its value, ratings and manufacturer part number shall be given.

(Res. 39-04, 4-21-04)

29.44.210 Guarantee.

The contractor shall include in his proposal all warrants and/or guarantees with respect to materials, parts, workmanship and performance of the product to be supplied. The minimum guarantee period for the product shall be one year from the date of final acceptance of the contract. The contractor shall attach to the bid a statement that all material to be supplied is either in exact accordance with the specifications or shall list in detail any and all deviations therefrom. The supplying of equipment that is not in accord with the specification and on which the contractor has indicated no exception shall be cause for rejection of the equipment and correction of the non-specification items entirely at the contractor’s expense.

(Res. 39-04, 4-21-04)

29.44.220 Underground facilities – Foundations.

(a)    All foundations shall be Portland cement concrete conforming to the applicable requirements of construction specifications of the City of Grand Junction, except as herein provided.

(b)    The bottom of concrete foundations shall rest on firm ground. Cast-in-place foundations shall be poured monolithically where practicable. The exposed portions shall be formed to present a neat appearance.

(c)    Forms shall be true to line and grade. Tops of foundations, except as noted on plans, shall be finished to curb or sidewalk grade or as ordered by the engineer. Forms shall be rigid and securely braced in place and inspected prior to the pouring of concrete. Conduit ends and anchor bolts shall be placed in proper position and in a template until the concrete sets.

(d)    Anchor bolts shall conform to the specifications and each individual bolt shall have two flat washers, and two nuts. Shims or other similar devices for plumbing or raking will not be permitted.

(e)    Both forms and ground that will be in contact with the concrete shall be moistened before placing concrete. Forms shall not be removed until the concrete has thoroughly set.

(f)    All abandoned foundations shall be removed and disposed of by the contractor. All conduit runs associated with an abandoned foundation shall be extended or abandoned as called for on the plans. When a foundation is removed, the hole shall be backfilled in accordance with State of Colorado and City of Grand Junction standard practices.

(Res. 39-04, 4-21-04)

29.44.230 Underground facilities – Conduit.

(a)    All cables and conductors not shown on the plans as aerial cable shall be installed in conduit unless installed in poles, pedestals, or mastarms. All metal conduits referred to in the specifications and shown on the plans shall be rigid and adequately galvanized. All PVC conduits will be of Schedule 80 or greater.

(b)    All trenches excavated in roadways, including new construction areas, shall be backfilled with concrete or State of Colorado approved flow fill, and capped with six inches of Grade E Asphaltic Pavement.

(c)    Following conduit schedule is in effect unless otherwise specified in the plans:

Run Type

Quantity

Size

Use

Street Crossings

1

3′′

120 voltage

Street Crossings

1

2′′

Low voltage

Street Crossings

1

2′′

EXCEL use

Signal Pole

1

3′′

Signal cables

Signal Pole

1

2′′

EXCEL use

Controller Cabinet

2

2′′

120 voltage

Controller Cabinet

1

2′′

Excel use

Controller Cabinet

1

2′′

Low voltage

Service Point

1

2′′

EXCEL use

Fiber Optic Interconnect

1

2′′

Communications

(d)    The contractor, at his sole expense, may use larger conduit if desired. Where larger conduit is used, it shall be for the entire length of the run from outlet. No reducing couplings will be permitted underground.

(e)    The end of all metal conduit, existing or new, shall be well reamed to remove burrs and rough edges. Field cuts of existing or new conduit shall be made square and true, and the ends shall butt together for the full circumference thereof. Slip joints of running thread will not be permitted for coupling metal conduit. When a standard coupling cannot be used, an approved threaded union coupling shall be used. All couplings shall be screwed up until the ends of the metal conduits are brought together.

(f)    Where a “stub out” is called for on the plans, a sweeping ell shall be installed in the direction indicated and properly capped. The locations of ends of all conduits in structures or terminating at curbs shall be marked by a “Y” at least three inches high cut into the face of the curb, gutter, or wall directly above the conduit.

(g)    Conduit bends, except factory bends, shall have a radius of not less than six times the inside diameter of the conduit. Where factory bends are not used, conduit shall be bent without crimping or flattening, using the longest radius practicable.

(h)    Conduit shall be laid at a depth of not less than 24 inches below the top of curb grade in sidewalk or grass areas and to a depth of not less than 30 inches below the finished grade in all other areas. Conduit under railroad tracks shall be not less than 48 inches below the bottom of the tie.

(i)    Trench excavations for conduit shall be two inches wider than the outside diameter of the conduit. Placing concrete or approved flow-fill up to the bottom surface of the existing or new roadway surface material shall accomplish backfilling of conduit trenches. The remaining portion of the excavation shall be backfilled with the same type of material used to construct the existing roadway surface.

(j)    Conduit shall always enter a foundation, pull box, or any other type structure from the direction of the run only.

(k)    Conduits terminating in a pole shall extend approximately six inches vertically above the foundation.

(l)    All conduit runs that exceed 10 feet in length shall have a continuous nylon line pulled into the conduit along with the specified electrical cables. The line shall be firmly secured at each end of the conduit run with a minimum slack of three feet. The purpose of this line is to be able to pull future electrical cable through the existing conduit runs. All nylon line shall be free of knots and “birds nest.”

(m)    Existing underground conduit to be incorporated into a new system shall be cleaned with a mandrel or blown out with compressed air.

(n)    New conduit runs shown on the plans are for bidding purposes only and may be changed with approval of the engineer.

(Res. 39-04, 4-21-04)

29.44.240 Underground facilities – Pull boxes.

(a)    A pull box shall always be installed in combination with a steel strain pole and at all other locations shown on the plans and at such additional points as ordered by the engineer. The contractor may install, at his own expense, any additional pull box that he may desire to facilitate the work.

(b)    Pull boxes that are required shall be fabricated and installed in general conformance with the size and details shown on standard drawings.

(c)    Pull boxes shall be installed so that the covers are level with curb or sidewalk grade or level with the surrounding ground when no grade is established. The bottoms of all pull boxes shall be bedded in crushed rock. Conduit stub outs into pull boxes shall be no shorter than four inches from bedding grade. When installed in the concrete, two bolts on each side of the pull box two inches below the top shall be installed to adhere the box to the concrete.

(d)    When a new conduit run enters an existing pull box, the contractor shall remove the pull box or tunnel under the side at no less than 18 inches and enter from the direction of the run. No new conduit will be allowed to enter a new or existing pull box in any other manner than that shown on standard drawings.

(Res. 39-04, 4-21-04)

29.44.250 Underground facilities – Detector loop wire installation.

(a)    Each individual detector loop is to be terminated as specified on the construction drawing, without splicing, to this termination point. Any required series or parallel connections are to be at the termination point.

(b)    All loops shall have a tag attached to the leading clockwise lead of the loop. This tag shall be marked to indicate the relative location of the loop. This marking shall correspond directly to the loop designations on the intersection drawing provided in the contract.

(c)    Detector loop roadway slots shall be cut in asphalt that has a six-inch minimum depth and sealed one-fourth inch below the surface level of the roadway with 3M sealer or approved equal.

(d)    Loop lead ins shall run to pull box on side of walk designated on plans. Leads shall not be placed in valve box in roadway unless approved by engineer.

(Res. 39-04, 4-21-04)

29.44.260 Underground facilities – Conductor and cable.

(a)    Wiring shall conform to appropriate articles of the National Electrical Code. Wiring within cabinets, junction boxes, etc., shall be neatly arranged and tagged/color coded per cable schedule.

(b)    Powdered soap stone, talc, or other approved lubricant shall be used in placing conductors in conduit.

(c)    A common neutral conductor, separate from the signal light circuit neutral, shall be used for all low voltage circuits, including the detectors and pedestrian push button circuits.

(d)    Splicing of cable will not be permitted in conduit, outside of signal heads, standards, foundations or pull boxes. All splicing shall be done in the pole base, except for loop wires and where the main tie in at the signal cabinet pull box/cabinet corner.

(e)    In no case shall any shellac compounds be used. Wire nut type connectors shall be used on all splices made above ground level. Detector loop lead in splices in underground systems shall be waterproofed with 3M splice kits or City approved equivalent. A minimum of 18 inches of slack shall be left at each splice except within hand holes where 24 inches shall be left.

(f)    When conductors and cables are pulled into the conduit, all ends of conductors and cables shall be taped to exclude moisture and shall be so kept until the splices are made or terminal appliances attached. Ends of spare conductors shall be taped and marked.

(g)    Cable shall be stranded.

(h)    A small permanent tag on which the direction and phase is printed, in the order named, using the codes given in “Cable Schedule,” shall be securely attached near the end of each conductor at each controller, standard, or pull box where conductors are separated. Where direction and phase are not clearly indicated by conductor insulation, additional tags shall be used.

Cable Schedule

Direction/Tag

Tape Color

NBLT

Red/Yellow

NB

Red

SBLT

Green/Yellow

SB

Green

EBLT

Orange/Yellow

EB

Orange

WBLT

Blue/Yellow

WB

Blue

Illuminated Street Signs

White

Pedestrian

Brown

Note: This is a typical cable schedule and shall be used for the wiring of all signal installations. A new cable schedule will be noted on the plans at each intersection where different phasing and/or special equipment is required. It should be noted that a band of yellow is used to indicate a left turn and brown for a pedestrian movement. This is in addition to directional tape for the phase. For cable size and number of conductors see traffic signal material specifications and/or standard drawings.

(i)    Inboard and outboard heads, mounted on mastarms, are to be wired separately from head to base of pole or pull box.

(Res. 39-04, 4-21-04)

29.44.270 Underground facilities – Bonding and grounding.

(a)    Metallic cable sheaths, conduit, metal poles, and foundations shall be made mechanically and electrically secure to form a continuous system and shall be effectively grounded. Bonding and grounding jumpers shall be copper wire, No. 8 AWG, for all systems.

(b)    Bonding of standards shall be by means of a bonding wire attached to a bolt or a three-sixteenths inch or larger bolt installed in the lower portion of the shaft.

(c)    At each pull box the ground electrode shall be a one piece copper ground rod of five-eighths inch diameter and eight feet in length, driven into the ground so that the top is two inches above the bottom of the pull box. The ground rod connector will be placed so that the bare copper wire, No. 8, can be pulled into a pole, foundation, or attached to the control cabinet ground buss.

(Res. 39-04, 4-21-04)

29.44.280 Underground facilities – Maintenance.

The contractor shall have full maintenance responsibility of the traffic signal from the date of the written notification by the City Transportation Engineer to the final inspection and date of written approval of the work performed. The contractor shall provide continuous maintenance and emergency service 24 hours each day during the time frame outlined above. The contractor shall provide and maintain a 24-hour-a-day continuous one number telephone answering service. All malfunctions of a controller and its accessory equipment shall be considered an emergency unless otherwise identified by the City. Equipment malfunctions and/or damage which, in the opinion of Grand Junction’s Transportation Engineer or other authorized person, constitutes a serious hazard or inconvenience to the public shall be considered an emergency. Such malfunctions or damage may include, but not necessarily be limited to, situations where:

(a)    All indications are out including bulbs and lenses, for any one traffic movement;

(b)    Signal heads give conflicting indications to any intersection approach;

(c)    A signal has been knocked down;

(d)    An overhead red indication is out.

Contractor shall undertake each such emergency repair no later than one hour after Grand Junction notifies contractor of the emergency.

(Res. 39-04, 4-21-04)

29.44.290 Underground facilities – Field testing.

Prior to completion of the work, the contractor shall cause the following tests to be made on all traffic signals in the presence of the engineer or his designee.

(a)    Each circuit shall be tested for continuity.

(b)    Each circuit shall be tested for grounds.

(c)    A functional test shall be made in which it is demonstrated that each and every part of the system functions as specified or intended herein. The functional test for each traffic signal system shall consist of not less than 14 days of continuous, satisfactory operation commencing with full operation of all electrical facilities. During the 14-day period, the contractor will maintain the system or systems. The cost of any maintenance necessary, except electrical energy and maintenance due to damage by public traffic, shall be borne by the contractor and will be considered as included in the price paid for the contract item involved, and no additional compensation will be allowed.

(Res. 39-04, 4-21-04)

29.44.300 Material specifications – Traffic signal indication unit specifications.

All signal indication units shall be of the individual section, adjustable type, gloss black polycarbonate or approved equivalent.

(a)    Visors shall be detachable, 12-inch tunnel type, open at the bottom; be gloss black in color on the outside and flat black on the inside.

(b)    Reflectors shall be a single piece of silvered glass or specular aluminum with an anodic coating. Reflectors shall conform to ITE standards.

(c)    Lenses shall be in accordance with Institute of Traffic Engineers Specifications.

(d)    Sockets shall be fixed focus.

(e)    Doors on the signal heads for the installation of lamps and lens replacement or other maintenance shall not require use of any tool whatsoever to be opened. Doors and lenses shall be equipped with neoprene weatherproof gaskets to ensure against infiltration of moisture, road film, and dust. Each three color signal unit shall have the socket leads from all signal sections connected to a terminal board stamped with identifiable terminals. There shall be a terminal for color indication plus a common terminal where one lead from each socket shall terminate. The terminal board shall be mounted in the middle section and be properly insulated. All openings, top and bottom, shall be for one-half inch pipe or pipe mounting brackets. Gaskets shall be supplied for top and bottom openings.

(Res. 39-04, 4-21-04)

29.44.310 Material specifications – Pedestrian signal units.

Sixteen-inch, one way, ICC or equal pedestrian signal heads as specified on the plans. “Walk/Don’t Walk” indications shall be symbolized and side by side. Visors shall be egg crate type and heads shall be gloss black. When countdown timers are required they shall be manufactured by Tassimco Technologies.

(Res. 39-04, 4-21-04)

29.44.320 Material specifications – Back plates.

(a)    Where shown on the plans, black back plates shall be furnished and installed on signal faces. No background light shall show between the back plates and the signal face or between sections. All back plates are to be of aluminum or plastic construction and shall be the louvered type. Back plates shall provide a five-inch border for all 12-inch signal heads.

(b)    Traffic signal heads requiring backboards shall be drilled for three-sixteenths-inch diameter by one-half-inch pan head bolt with nut and lock washer. If the manufacturer fails to supply as described, it will then be the contractor’s responsibility to do so. When installing backboards on the traffic signal head, the contractor will furnish three-sixteenths-inch fender washers between bolt head and backboard.

(c)    The manufacturer will fabricate all backboards with a three-sixteenths-inch washer on both sides of each rivet, which is used to hold each section of backboard together.

(Res. 39-04, 4-21-04)

29.44.330 Material specifications – Traffic signal lamps.

All signal indications, for both vehicle and pedestrian signals, shall be LED and meet the requirements of the applicable CDOT specifications.

(Res. 39-04, 4-21-04)

29.44.340 Electrical cable – Signal cable.

14 AWG multi-conductor, stranded, copper wire manufactured to meet IMSA 19-1 specifications or approved equivalent. Each conductor in the cable will be individually insulated and rated at 600 volts.    The number of conductors per cable will be specified in quantities and blueprints for the project in question.

(Res. 39-04, 4-21-04)

29.44.350 Electrical cable – Traffic wire specifications.

20 Conductor (Under Ground to Each Corner)

Green

Main St. Green

Orange

Main St. Amber

Red

Main St. Red

White

Through Traffic Common

Orange with Red tracer

Main St. Amber Arrow

Green with White tracer

Main St. Green Arrow

White with Black tracer

Turn Arrow Common

Blue

Main St. Walk

Black

Main St. Don’t Walk

White with Red tracer

Pedestrian Common

Green with Black tracer

Side St. Green

Orange with Black tracer

Side St. Amber

Red with Black tracer

Side St. Red

Red with White tracer

Side St. Amber Arrow

Blue with Black tracer

Side St. Green Arrow

Blue with White tracer

Side St. Walk

Black with White tracer

Side St. Don’t Walk

Black with Red tracer

Side St. Red Arrow (exclusive)

Blue with Red tracer

Spare

Red with Green tracer

Main St. Red Arrow (exclusive)

7 Conductor (Through Traffic Vehicular Heads)

Green

Green

Orange

Amber

Red

Red

White

Common

White with Black tracer

Spare

Blue

Spare

Black

Spare

7 Conductor (5 Section Turn Arrow Vehicular Heads)

Green

Green

Orange

Amber

Red

Red

White

Through Traffic Common

Blue

Green Turn Arrow

Black

Amber Turn Arrow

White with Black tracer

Turn Arrow Common

All spare wiring in vehicular heads shall be kept at length, marked with black tape and coiled neatly in the amber lens housing.

7 Conductor (Pedestrian Heads)

Green

Main St. Walk

Red

Main St. Don’t Walk

White

Main St. Pedestrian Common

Orange

Side St. Walk

Black

Side St. Don’t Walk

White with Black tracer

Side St. Pedestrian Common

Loop Lead-In Wire: 18 Gauge 3 Pair Shielded

Black/White

Through Traffic

Black/Red

Turning Traffic

Black/Green

Spare

Directional Color Codes

Red

N/B

Orange

E/B

Green

S/B

Blue

W/B

Yellow

Left Turn

Brown

Pedestrian

Pedestrian Push Button Wiring (2 Pair 18 AWG)

Black and Red (Labeled Pair One (1))

Main Street

Black and Red (Labeled Pair Two (2))

Secondary Street

Illuminated Street Sign Wiring (12 AWG (UL) Type UF with Ground)

Black

AC Positive

White

AC Negative

Bare

Green (Ground)

(Res. 39-04, 4-21-04)

29.44.360 Electrical cable – Interconnect cable.

General single mode fiber optic cable shall conform to the following general cable specifications and in accordance with the city’s signal communications plan:

(a)    Fiber complies with EIA/TIA 455 and IEC 793 test methods for required attributes.

(b)    The cable is loose tube with a dry block to prevent water from seeping into the cable (no gel fillings shall be permitted).

(c)    All fiber optic cables intended to be installed in conduit are dielectric.

(d)    A minimum length of 1.8m on each end of the cable is accessible for on-reel testing.

(e)    Fiber has a D-LUX coating or approved equivalent to ensure color retention, minimize microbending losses and improve handling. The coating is mechanically strippable.

(Res. 39-04, 4-21-04)

29.44.370 Electrical cable – Loop wire.

Detect-A-Duct Cable consisting of single conductor No. 14 stranded THHN with an outer protective sleeve.

(Res. 39-04, 4-21-04)

29.44.380 Electrical cable – Pedestrian push button cable.

Push-button wire shall be two conductor quarter-inch diameter, shielded and jacketed cable. Conductors shall be AWG No. 18 stranded copper with polypropylene insulation.

(Res. 39-04, 4-21-04)

29.44.390 Electrical cable – Loop lead in cable.

Detector loop lead in cable shall be a six-conductor quarter-inch diameter, shielded and jacketed cable. Conductors shall be AWG No. 18 stranded copper with polypropylene insulation. The conductors shall be twisted at least six turns per foot. Color rotation shall be black and red, black and white, black and green. The interior of the cable shall be filled with an amorphous material that prevents water penetration. Aluminized polyester shielding shall be applied around the conductors to prevent electromagnetic interference. The cable jacket shall consist of black or gray high-density polyethylene. The jacket shall not be degraded by prolonged exposure to typical pavement runoff components. The cable shall be suitable for operation at temperatures of minus 60 degrees Celsius to plus 80 degrees Celsius.

(Res. 39-04, 4-21-04)

29.44.400 Electrical cable – Illuminated street name signs wire.

Shall be UL Type UF 12-2 with ground 600 volt sunlight resistant grade romex.

(Res. 39-04, 4-21-04)

29.44.410 Electrical cable – Ground.

Single conductor, AWG No. 8, soft drawn bare copper wire.

(Res. 39-04, 4-21-04)

29.44.420 Electrical cable – Optical detector lead in cable.

The lead in cable for the emergency vehicle optical detectors shall be 3M Type 138 or approved equal.

(Res. 39-04, 4-21-04)

29.44.430 Vehicle detectors – General.

(a)    Detectors shall be 3-M Canoga or approved equivalent.

(b)    This specification defines the minimum design operational and performance requirements for multiple channel, digital self-tuning inductive loop detectors. Detector units shall be card rack mounted plug-in type and operate from an external 24 VDC power supply. Detector units shall be in full compliance with the environmental and size requirements of NEMA standard TS1 Section 15 and meet the design, operation, electrical and functional performance requirements of both TS1 and TS2 specifications.

(c)    The front panel shall include an erasable, write-on channel identification area and clearly indicated switch operating position. I.D. area one centimeter square per channel minimum.

(d)    All component part and test points shall be clearly identified by permanent marking of circuit referenced on the P.C. board. Integrated circuit devices having 16 or more leads shall be socket mounted to facilitate repair and maintenance of units. Detectors supplied to this specification shall be warranted by the supplier to be free of defects in materials and workmanship for a period of five years from date of shipment from manufacturer.

(e)    Each detector unit shall include two or four complete detector channels. Each channel shall sequentially energize its loop inputs to eliminate crosstalk (mutual coupling) between large, very closely spaced adjacent loops connected to the same unit. The sequential time sharing and digital processing of loop inductance data shall be accomplished on a single LSI microcircuit per unit for maximum reliability. The method of measuring shall be crystal reference digital period counting, multi-channel scanning. Only one channel input per unit shall be active at any point in time.

(1)    Sequential scanning shall fully prevent crosstalk between channels of a detector connected to closely spaced or overlapped loops for directional detection.

(2)    Sequential scanning shall allow two detection channels to operate with full performance using a common home run cable.

(3)    Sequential scanning shall allow two or more detection channels to be connected to a single detection amplifier with full operating performance, including separate mode and sensitivity selection capability on each channel.

(f)    Each channel of the sensor unit shall automatically self-tune to any loop and lead in inductance from 20 to 2,500 micro henries within two seconds with full sensitivity after application or interruption of supply voltage. Units shall also track changes in loop/lead in electrical characteristics, as might reasonably be expected to occur in undamaged loops, properly installed in sound pavements, without producing false indications or changes in sensitivity.

(g)    Each detector unit shall be provided with a loop test switch position to verify loop system integrity and reduce maintenance costs. The “open loop test” position shall indicate a previous fault via the front panel indicator. The memory shall remain intact and can be queried repeatedly. Existing detections shall not be reset and the memory shall only be reset by power interruption as by removing and re-inserting the plug-in detector units.

(h)    Each channel shall include a 16-position push-type wheel switch to allow selection of eight pulse sensitivities, seven presence levels and a “Reset” and an “Off” position. Each detector unit shall include eight sensitivity selections in 2:1 steps that can be correlated to the relationship of the number of turns of wire in a loop versus the sensitivity required to detect a specified vehicle. The selections shall be designed to allow detection of licensable vehicles in loops of two or more turns electrically in series, parallel or series/parallel configuration in nonreinforced or reinforced pavements with lead in/homerun combinations from 50 feet to 1,000 feet. The number of turns in a loop, electrical configuration of multiple loops and pavement type will dictate the sensitivity required for proper, predictable detection.

(i)    If specified, channel presence time shall be modified if delay or extension time is selected. The timing switch shall select delay or extension or “Off,” if no timing is desired. Internal DIP switches shall provide for selection of “Delay” time of zero to 31 seconds in one-second increments and “Extension” time of zero to seven and three-quarters seconds in quarter-second increments.

(j)    Presence indicators shall be wide angle, high brightness type LEDs suitable for sunlight visibility. When timing is selected and a channel is active that channel’s indicator shall flash at four Hz during delay and at 16 Hz during extension to indicate timing is in progress. Further, the timing shall be aborted when the vehicle is no longer present and/or the channel control input shall become inactive. The delay timer shall be reset when a vehicle leaves the loop prior to time out and shall abort when the control input becomes inactive. The extension timer shall operate and reset when a vehicle leaves the loop and be aborted when the control input becomes inactive. Each timer (delay and extension) shall be provided with buffer circuitry to enable or disable the timer based on an external input (green gate) signal. Circuit shall be designed for AC or DC input control on AC powered units and for DC control on DC powered units.

(k)    Each detector unit shall utilize a ΔL = (Delta L) thresholding technique to provide a more constant, predictable vehicle detection sensitivity with series added inductance, i.e., many loops connected in series and/or long lead in/homeruns will generally require the same sensitivity setting as would be required for a single loop with short lead in, to simplify setup.

(l)    Each channel shall automatically recover from intermittent opens or multiple shorts to ground. Each channel shall tolerate and continue to operate with no change with a single point short to ground on the loop or lead in system. Each channel shall provide a continuous, non resettable (fail safe) output and indication in response to an open loop/open lead in system. The open loop indication and output shall not be resettable as long as the open exists, except that they shall be defeated when the channel “Off” position is selected.

(m)    Extended features shall include: two serial ports (front panel RS232 and Edge connector Xmit/Recve), TS1 and TS2 compatible from manual or software switch, micro loop occupancy detection, traffic counting capable to include long-loop presence count from 15 minute to infinite intervals all accessible from either serial interface, dual detect and fault LED indicators per channel, external inputs to control timing functions and enable remote reset, extended diagnostics, programming and live status available via serial interface utilizing Windows compatible software.

(Res. 39-04, 4-21-04)

29.44.440 Vehicle detectors – Vehicle video detection.

Shall be Iteris video detection equipment or approved equal.

(Res. 39-04, 4-21-04)

29.44.450 Vehicle detectors – Emergency vehicle detectors.

Optical communication detectors for emergency vehicle preemption shall be components of the 3M Opticom Priority Control System (Model 754 or as approved by the Engineer). All detectors shall be two-direction, two-channel. Detectors, phase selectors, harnesses, rack mount, and cabling shall be the manufacturer’s latest make and model. No splicing of the lead-in cable shall be allowed.

(Res. 39-04, 4-21-04)

29.44.460 Pedestrian push button detectors – General.

Push buttons shall be manufactured by Alinco Electric Sales or approved equal.

(a)    Pedestrian push buttons shall be of the direct push button contact type. They shall operate on a voltage not to exceed 18 volts AC. They shall be of tamper proof design and equipped with a push button instruction sign as shown in the Standard Details.

(b)    The assembly shall be weatherproof.

(c)    The housing shall be shaped to fit the curvature of the pole to which it is attached to provide a rigid installation. Saddles shall be provided to make a neat fit when required. Pedestrian signs shall be installed as shown on the Standard Details.

(Res. 39-04, 4-21-04)

29.44.470 Illuminated street name signs – General.

Lighted street name signs shall be manufactured by NuArt or approved equal.

(a)    Signs shall have a city logo on the left side.

(b)    The background shall be blue.

(c)    Lettering to be white uppercase and lowercase font.

(d)    Photo cell mounts shall be on the bottom of illuminated street name sign frame.

(e)    One-half-inch black wire loom shall be used to cover romex drip loop coming from sign into mastarm.

(Res. 39-04, 4-21-04)

29.44.480 Traffic signal poles, pedestals and mastarms.

Traffic signal poles, pedestals, and mastarms shall be of the general configuration shown on standard drawings. All traffic signal poles and mastarms shall be designed to meet the requirements outlined in the 1985 edition of “Standard Specifications for Structural Supports for Highway Signs, Luminaries, and Traffic Signals,” published by AASHTO, for a wind velocity of 90 miles per hour. Poles shall be galvanized. Poles shall be manufactured by Valmont or approved equal.

(Res. 39-04, 4-21-04)

29.44.490 Controller cabinet – General.

(a)    All controllers and auxiliary equipment shall be housed in a factory wired, weatherproof, metal cabinet following NEMA specification TS2 Type 1. The cabinet shall have minimum interior dimensions, exclusive of stiffeners, shelf brackets, etc., of height 46 inches, width 29 inches, and depth 15 inches.

(b)    The cabinet shall be constructed of 0.125 minimum thickness bare aluminum. Cabinets shall be braced internally or by folded seams in order to provide sufficient rigidity to withstand normal handling and transport to the field location without deforming.

(c)    The main door shall have a self-locking, keyed, tumbler lock with two keys. Hinges shall be mounted on the cabinet in such a way that interchange ability of doors is possible between cabinets of like size and manufacture. Hinge pins shall be stainless steel. Doors shall have neoprene gaskets of sufficient thickness to provide a rain tight and dust tight seal. Secondary door (back door) shall have same design as the main door.

(d)    The engineer will provide, during the construction period, an additional external lock for the controller cabinet to maintain security of the controller cabinet.

(e)    A police or auxiliary door shall be provided. It shall be constructed so that no sharp edges protrude from the main door and shall provide access to a panel with labeled switches for automatic to flashing operation and signal power on/off.

(f)    The cabinet shall be equipped with two thermostatically controlled, ball bearing fans with a capability of at least 100 cubic feet per minute. The fans shall be mounted in a weatherproof housing attached to the top of the cabinet. The thermostat shall be adjustable to turn on between 90 degrees Fahrenheit and 150 degrees Fahrenheit and be so mounted as to be easily accessible for adjustment from the front of the cabinet. An internally mounted incandescent lamp socket shall be provided with 150-watt capability and switched “on” only when the main door is open.

(g)    The cabinet shall have two shelves each capable of supporting 75 pounds. Shelves shall be supported on brackets which provide for height adjustments. Each cabinet shall contain a 10-mil thick plastic envelope with side opening. It shall be a minimum size of 10 inches by 12 inches and be attached to the door by screws.

(h)    Assembly Wiring. All cabinet wiring shall be neatly arranged and laced or enclosed in plastic tubing. No harness or wire shall be attached to any shelf rack or other point where movement of shelves or doors may damage it.

(i)    Terminal Facilities. Terminal facilities (load bays) shall be firmly attached in a position not less than six inches from the bottom of the cabinet so as to provide easy access and maximum convenience to the user.

(j)    Side mounted auxiliary panels should be firmly installed with the forward edge not more than four inches from the door sill and not less than six inches from the bottom of the cabinet in all cabinets.

(k)    The load bay and its associated equipment, harness, switches, etc., shall be grouped on removable panels. Each panel or group of receptacles and connecting cables shall be arranged to permit so that work can be performed on panel backs or cables.

(l)    A load switch bay and flash transfer capability is required for each phase. Load switches shall be provided for all the phases in the cabinet.

(m)    The load bay shall be protected by a main circuit breaker. A gas tube surge arrestor with MOV and a suitable radio interference filter shall be supplied. The arrestor shall be a three-electrode type with the following ratings:

(1)    Impulse breakdown: less than 1,000 volts in less than 0.1 microseconds at 10 kV per microsecond.

(2)    Standby current: less than one milliamp ere.

(3)    Striking voltage: greater than 212 VDC.

(4)    Energy capability: capable of withstanding pulses of peak current each of which will rise in eight microseconds and fall in 20 microseconds to one-half the peak voltage at three-minute intervals.

(5)    Peak current ratings shall be 20,000 amps. The MOV shall have ratings equal to or better than a General Electric type VI50LA20A. The RFI filter shall have a current rating equal to or greater than the main circuit breaker capacity.

(n)    Field terminals shall be screw types, capable of accommodating at least three number 12AWG wires. Engraving, silk screening or contrasting plastic labels shall permanently identify all terminals in the load bay. Terminal blocks shall be the barrier type and no live parts shall extend above the barrier.

(o)    A convenience construction grade duplex, fused at 15 amps shall be provided. It should be located in a position which is convenient and safe for service personnel.

(p)    All AC power busses, switch or relay lugs and/or similar activity connection points which extend more than one and one-half inches from the panel are to be protected by insulation for safety. The locations of these items shall provide reasonable protection for service personnel.

(q)    Signal power relays shall be mercury wetted, equal to or greater than circuit breaker capacity. Flash transfer relays shall be as manufactured by Midtex Model 136-62 T 3A1, 120 VAC, DPDT, 30 amp with Jones Plug base and dust cover or approved equal.

(r)    Flasher. The cabinet shall be equipped for flashing operation of signal lights with a two-circuit solid state flasher in accordance with the latest NEMA specifications (15 amps per circuit). Flashing operation shall be set for flashing yellow on all main street approaches and red on all other approaches. Pedestrian and turn signals shall be extinguished during flashing operation. The flashing mechanism shall remain in operation during shutdown or removal of controller.

(s)    Load Switches. The cabinet shall be equipped with solid state load switching assemblies in accordance with the latest NEMA specification. Each load switch to be equipped with a three input LED indicator. Load switches shall contain three separate cube type solid state relays, which use a solid state switch which is capable of operations at 240 VAC and 25 amps when properly heat-shrinked but derated to 10 amps when used in load pack assembly.

(t)    Conflict Monitor. The cabinet shall have provision for conflict prevention in accordance with the latest NEMA TS2 specification. A conflicting display monitor unit that monitors all green, yellow and walk displays and detects absence of reds to cause flashing operation and stop timing if conflicting indications are detected shall provide conflict prevention. Removal of the monitor from the cabinet shall cause flashing operation. Conflict monitors shall be as manufactured by Eberly Designs, 12 LEP or approved equal.

(u)    Emergency Vehicle Preemption. The cabinet shall be equipped and wired with an Opticom Card rack mount for 3M Model 754 or approved equal. Detectors, phase selectors, harnesses, rack mount, and cabling shall be the manufacturer’s latest make and model.

(Res. 39-04, 4-21-04)

29.44.500 Actuated controllers – General.

(a)    Compatibility. The local controller and cabinet shall be 100 percent compatible with the City of Grand Junction’s existing computerized signal system which utilizes Econolite equipment, or necessary modifications of the software and hardware shall be included to make both systems fully compatible.

(b)    An actuated controller shall be completely solid state, electronic device capable of selecting and timing traffic movements. It shall provide timing and load switch control of each major vehicular phase, including concurrent associated pedestrian movements. The controller shall conform to the latest NEMA specifications and shall provide for complete and full operation of eight phases from within either a TS1 or TS2 type 1 cabinet.

(c)    The controller shall have all electronic components easily accessible and arranged in functional groupings on the printed circuit boards. Printed circuit boards shall be designed to facilitate identification of components for maintenance purposes. Printed circuit design shall be of NEMA specification quality and designed so that the components may be removed and replaced without permanent damage to the board or track.

(d)    Timing shall be adjustable on the controller face by keyboard programming. A security code or other means shall be provided to prevent unauthorized or accidental entry.

(e)    Timing shall be readable from a display that is sufficient to make certain that all register positions can be easily and definitely recalled. Every keyboard controller shall have an easily followed legend silk screened on the face of the controller or on a metal or plastic card or placard which is securely attached by screws or rivets.

(f)    All circuitry components shall be available on the open market and the original manufacturer’s part number shall be shown on the parts list.

(g)    Overlap programming shall be provided by NEMA standard overlap board and/or keyboard.

(h)    An entry mode to any single phase parameter of a keyboard controller shall not affect any other parameter or the same parameter on another phase, unless programmed by specific keyboard instructions, such as “copy” sequences or other prescribed methods of rapid program entry.

(i)    Every controller supplied shall be the manufacturer’s latest, first line production model tested and delivered by a domestic manufacturer who is regularly engaged in the construction of such equipment.

(j)    Each controller shall be supplied with a complete set of operational and service manuals, wiring schematics and parts layout up to a maximum of 10 sets per order. Any controller for which these documents are not available is not a production model within the meaning of these specifications.

(k)    Each controller shall have a removable data module.

(l)    Preemption. All actuated controllers shall be equipped to accommodate four E.V.P. inputs and one railroad preemption input.

(Res. 39-04, 4-21-04)

29.44.510 Actuated controllers – Coordination unit.

(a)    The coordination unit shall be an internal function within each local controller and shall meet, as a minimum, the following functional requirements.

(b)    The coordinator shall provide for at least four cycle lengths adjustable from 30 to 255 seconds, three offsets adjustable from zero to 99 percent with offset correction by dwelling in coordinated phase or smooth transition, and four splits per cycle.

(c)    Standard NEMA functions shall be used to control the intersection timing.

(d)    The coordinator shall be capable of changing the controller’s phase sequence upon command and telemetry failure.

(e)    The coordinator shall be capable of setting the intersection free by loss of system sync, cycle/offset false commands, free command and telemetry failure.

(f)    The coordinator shall be capable of setting the intersection into a flashing operation in accordance with the Manual on Uniform Traffic Control Devices, latest edition.

(g)    The coordinator shall be capable to operate with telemetry module without additional hardware or software.

(h)    Time base coordination mode shall be provided as a backup with all standard coordination features available. At least two seven-day programs shall be available with 50 additional holiday programs in the event of a master controller or communications failure. Time base standby mode shall be programmable for an entire year with automatic daylight savings and leap year changes.

(Res. 39-04, 4-21-04)

29.44.520 System telemetry.

(a)    Telemetry equipment shall be an internal plug-in module to a local controller with easy access for removal. Master controller or stand alone chassis may contain standard plug-in module. Each telemetry unit shall be capable of transmitting data to and from local controller, local detectors and system detectors (eight per intersection). A provision shall be made to reject invalid messages. The system command shall be transferred each second to maintain time sync.

(b)    The telemetry equipment shall be designed so that all communications among intersections in one system can be accomplished over no more than two pairs of hard wire interconnect or leased phone lines. Dedicated pairs from the master to each local intersection are not permitted.

(Res. 39-04, 4-21-04)

29.44.530 On-street master – General.

(a)    Cabinet Assembly. The master controller shall be wired into a cabinet assembly that also includes a local intersection equipment configuration. The cabinet shall be wired complete with master connecting cables in accordance with applicable portions of the local controller cabinet specifications. The incoming power service and interconnect terminals shall be adequately equipped with surge arrestors to protect against high-energy transients.

(b)    Incoming Sensor Data. The master shall have the ability to receive output data from at least eight sensors from each local intersection. It shall be possible to assign at least 32 of the incoming sensors to internal computational channels for pattern selection analysis.

(c)    Traffic Pattern Selection. The program in effect shall be selected on a priority basis with the following priority arrangements:

(1)    Manual entry from keyboard;

(2)    External command from a master;

(3)    Time of day/day of week schedule;

(4)    Traffic responsive based on sampling sensor analysis.

(d)    The master shall select one of six different cycle lengths or “free” operation based on inbound or outbound volume levels. It shall be possible to program segments in the volume range levels to change to the next higher or lower cycle lengths.

(e)    The master shall be able to select any of five different offset plans per cycle. Offset plans shall be chosen based on the differential between inbound and outbound volume levels. The five offset plans shall be designated as follows:

(1)    Heavy inbound;

(2)    Inbound;

(3)    Average;

(4)    Outbound;

(5)    Heavy outbound.

(f)    When balanced flow occurs, the master shall select the average offset plan. When the volume in one direction exceeds the volume in the other direction by the programmed amount, a standard preferential offset shall be implemented. If the volume differential exceeds a second (higher) programmed amount, a heavy preferential offset must be implemented. It shall also be possible to reserve the heavy preferential offset plans for special pattern implementation only. Programmable settings must be provided for both entering and leaving each offset.

(g)    Split plan selection shall be identical to offset plan selection except that arterial traffic volume levels must be compared to side street volume levels. Three different split plans shall be provided:

(1)    Heavy arterial;

(2)    Average;

(3)    Heavy side street.

(h)    The master shall call for the average split plan during normal conditions. If the arterial volume exceeds the side street volume by the programmed amount, the heavy arterial split shall be selected. In the same manner, if side street volume exceeds arterial volume by a programmed amount, the heavy side street split shall be called.

(i)    Crossing Artery Synchronization. The master controller shall have capability to coordinate with a separate master controller of the crossing artery through the common intersection for both systems.

(j)    System Diagnostics. Diagnostic tests shall be performed on system detectors, telemetry communications and intersection operation.

(k)    Sampling sensors shall be monitored for absence of calls or constant calls. If a sensor fails, it shall be automatically disconnected from the calculations for traffic responsive plan selection. If normal sensor operation resumes, the sensor shall be automatically reinstated.

(l)    Telemetry communications diagnostics shall monitor readbacks for no response condition including local telemetry and telemetry channels.

(m)    Intersection diagnostics shall be available to display intersection status condition. All fault conditions shall be reported and logged.

(n)    Count Storage. The master shall have the ability to tabulate and store 15-minute count data from up to 32 different sensors. The data shall be available for automatic transfer to the central office facility upon request.

(o)    The selection of the sensors to be counted in any 24-hour period shall be completely programmable from the central office computer.

(p)    Miscellaneous Data Storage. The master shall store all of the following data:

(1)    The time of day and location of all sampling sensor failures. If normal operation resumes, this time shall also be recorded.

(2)    The time of day, location and mode of all local intersection failures. The time that normal operation resumes must also be recorded.

(3)    The time and mode of all pattern changes. Changes due to external override must be distinguished from normal pattern changes.

(4)    The average volume or occupancy level for each 15-minute period for all computational channels.

(q)    It shall be possible to transmit any of the data listed above to the central office computer automatically or upon demand.

(r)    Downloading Local Coordination Settings. It shall be possible to download any local intersection coordination setting (offset, force off or permissive period) from the master via the unit’s keyboard.

(s)    Display. During normal operation, the timing pattern in effect shall be displayed on the front panel, including the cycle, offset plan and split plans selected. Also, the unit shall indicate how the timing plan was selected through normal volume calculations, by an occupancy channel or by manual or central computer override. The master shall also indicate when the time of day mode is in effect and show whether this mode was selected manually or because of sensor failures.

(t)    External Override. The master controller shall have appropriate inputs to externally select any timing pattern and override the pattern selected through traffic analysis.

(u)    Telemetry. The master shall include a telemetry module for two-way communications between the master and local controllers. The equipment shall be compatible with the telemetry equipment specified for the local controllers.

(Res. 39-04, 4-21-04)

29.44.540 Traffic signing and pavement markings.

(a)    General. The installation of all traffic control devices shall conform to the Manual on Uniform Traffic Control Devices and the Colorado Standard Specifications for Road and Bridge Construction, latest edition.

(b)    Traffic Control Devices on Public Property. The developer, at his own expense, will generally install all permanently fixed traffic signs. The developer must submit a signage plan for approval by the City Transportation Engineer. Traffic signs shall be placed to conform to the drawing details.

(c)    Traffic Control Devices on Private Property.

(1)    Responsibility. All traffic control devices on private property, i.e., pavement markings, regulatory signs, fire lane signs, and handicapped parking signs shall be installed and maintained by the property owner.

(2)    Placement. A signage and striping plan specifying the various types and combinations of traffic control devices shall be submitted to the City Transportation Engineer for approval.

(d)    Pavement Markings. The contractor shall submit a plan for all pavement markings to the City Transportation Engineer for approval prior to the beginning of the work. The pavement marking plan shall meet the requirements for such work as outlined in the Manual on Uniform Traffic Control Devices. The City Transportation Engineer must approve all pavement marking materials.

(Res. 39-04, 4-21-04)

29.44.550 Traffic control in construction areas – General.

For any construction done on, in or to an existing City roadway and/or right-of-way or for the construction of a new City roadway, appropriate traffic control during construction shall be provided. For any such construction, a construction traffic control plan shall be prepared by the contractor and/or project engineer and shall be approved by the City Transportation Engineer prior to issuance of a street cut permit or public improvement construction permit.

Where a roadway does not currently exist, it is presumed that there is no motorist expectation of a travel route. Therefore, a construction traffic control plan for construction of a new roadway should strive to do two things: alert the motorist that this is a construction area, and alert the motorist that the road is not open to traffic. Construction traffic control plans shall also be prepared for construction occurring on existing City roadways where the motorist has an expectation of accessibility and shall be warned, advised, guided or regulated through any construction activity.

(Res. 39-04, 4-21-04)

29.44.560 Traffic control in construction areas – Time of submittal.

A construction traffic control plan shall be submitted to the City Transportation Engineer at the earliest with the submittal of final construction plans and at the latest with the application for a right-of-way or public improvement construction permit(s). All final construction plans submitted to the City of Grand Junction that entail construction on an existing City roadway or construction of a new City roadway must either:

(a)    Be accompanied by a construction traffic control plan.

(b)    Include a note stating a construction traffic control plan shall be submitted to the City of Grand Junction for approval before any permit for construction is issued. No right-of-way or public improvement construction permit shall be issued without the approved construction traffic control plan.

(Res. 39-04, 4-21-04)

29.44.570 Traffic control in construction areas – Scope of construction traffic control plan.

For construction of new roadways, traffic control during construction should strive to keep the motorist from entering the facility. The primary means to accomplish this are by use of temporary barricades located in advance of the point where new construction joins old and appropriate signing. New roadways shall not be opened to general traffic, nor the construction traffic controls removed, without the approval of the Engineering Construction Inspector and the City Transportation Engineer. One precondition of such an opening is that permanent signage and striping be in place.

(Res. 39-04, 4-21-04)

29.44.580 Traffic control in construction areas – Elements of construction traffic control plan.

(a)    All construction traffic control plans shall contain the following information:

(1)    Name of contracting firm and, if different, the name of the firm responsible for traffic control devices.

(2)    Name and phone number(s) of 24-hour contact person responsible for traffic control devices.

(3)    Description of location of activity (roadway names, north arrow, etc.)

(b)    Projects identified as minor construction traffic control plans as determined by the City Traffic Engineer shall include, in addition to items listed in subsection (a) of this section, either one of the following:

(1)    A neat sketch of the roadways and the proposed traffic control devices; or

(2)    A copy of a typical drawing of traffic device layout from an accepted source approved by the City’s Transportation Engineer.

(c)    Projects identified as major construction traffic control plans as determined by the City Transportation Engineer shall include, in addition to items in subsection (a) of this section, the following: The proposed traffic control devices specifically identified as to type and explicitly noted and dimensioned on as-builts, construction plan drawings or other detailed drawings.

(Res. 39-04, 4-21-04)

29.44.590 Traffic control in construction areas – Basis for construction traffic control plan.

The Manual on Uniform Traffic Control Devices shall be the basis upon which the traffic control plan is designed in concert with proper, prudent and safe engineering practice. All necessary signing, striping, coning, barricading, flagging, etc., shall be shown on the plan. Other acceptable documents may be consulted or referenced, such as Traffic Control in Construction and Maintenance Work Zone (FHWA) and Flagging and Traffic Control Supervisor’s Training Manual (CDOT).

(Res. 39-04, 4-21-04)

29.44.600 Traffic control in construction areas – Restriction, regulations and opportunities.

In concept, City streets shall not be closed overnight and work shall not force road or lane closures before 8:30 a.m. or after 3:30 p.m. If exceptions to this are required, this shall be noted on the construction traffic control plan and shall be approved by the City Transportation Engineer. Travel-way width may be restricted. Minimum travel lane width in construction areas shall be 10 feet, but proper controls, including flagging, shall be indicated. Prohibition of on-street parking should be considered and noted where applicable.

All traffic control devices necessary to provide for public safety at the work site shall be furnished and maintained by the contractor at his own expense. If the contractor does not provide the approved traffic control devices, the City Transportation Engineer may install such devices, and the entire costs of such devices shall be borne by contractor. If the City is required to install the required traffic control devices due to negligence by the contractor, a minimum administrative charge of $300.00 will be assessed to the contractor.

(Res. 39-04, 4-21-04)

29.44.610 Traffic control in construction areas – Approval.

Staff of the City’s Transportation Engineering Division should approve (sign and date) all construction traffic control plans. In general, this responsibility rests with the Engineering Division Inspection Section. However, it is likely that most major plans will be referred to the Traffic Section for consideration. All complete road closures and all partial road closures (removing one or more travel lanes) that are proposed for overnight shall be approved by the City Transportation Engineer. One copy of the approved plan shall remain with the Inspection Section for their verification that the traffic control plan has been adhered to in the field. One copy shall be placed in the engineering project file. The contractor shall have one approved copy of the traffic control plan on-site at all times.

(Res. 39-04, 4-21-04)

29.44.620 Traffic control in construction areas – Modifications.

Actual conditions in the field may necessitate modifications to the construction traffic control plan. Provided that the general intent of the original plan is satisfied, these modifications may occur without revision to the plan. The Engineering Construction Inspector shall be notified of any substantial changes and may refer these to the Transportation Engineering Division as needed for construction.

(Res. 39-04, 4-21-04)