Division 13-12-003
Lighting Layout Requirements
Sections:
13-12-003-0001 Intent of Roadway Lighting
13-12-003-0002 Streetlights at Intersections
13-12-003-0002.1 General Requirements
13-12-003-0002.2 Streetlights at Unsignalized Intersections
13-12-003-0002.3 Streetlights at Signalized Intersections
13-12-003-0003 Spacing of Streetlights
13-12-003-0004 Location and Placement of Streetlights
13-12-003-0001 Intent of Roadway Lighting
The intent of roadway lighting is to improve transportation safety and efficiency. The individual elements that compose the lighting installation shall complement this intent. The street lighting design shall include safety considerations to minimize hazards presented by poles as roadside and pedestrian obstacles, and as line-of-sight obstructions. (Ord. 2017-22, Rep&ReEn, 07/05/2017; Ord. 2020-10, Amended, 09/15/2020 (Res. 2020-13))
13-12-003-0002 Streetlights at Intersections
13-12-003-0002.1 General Requirements
A. Luminaire Type and Output. All intersection lighting shall generally follow Table 13-12-003-01 for the corresponding roadway type and land use type. At improved pedestrian crossing locations with and without signalization, additional lighting treatments may be considered as part of a comprehensive pedestrian crossing enhancement project. At traffic signalized intersections, phosphor converted amber (PCA) LED shall be utilized with a Type III distribution.
B. Luminaire Output – Multiple Installation. At intersections where more than one (1) streetlight is required, all lights shall have the same output. The luminaire output shall be determined from Table 13-12-003-01 for the functional classification of the leg of the intersection requiring the highest output luminaire. (Ord. 2017-22, Rep&ReEn, 07/05/2017; Ord. 2020-10, Amended, 09/15/2020 (Res. 2020-13))
13-12-003-0002.2 Streetlights at Unsignalized Intersections
A. A streetlight shall be installed at each unsignalized public street intersection with the following exceptions:
1. Street Width. At intersections where the width of one (1) or more of the approaches is greater than or equal to fifty (50) feet as measured to the back of curb (on urban street sections) or edge of pavement (on rural street sections), two (2) streetlights shall be installed on diagonally opposite corners.
2. Local Streets. Streetlights are not required at intersections involving only local streets. Upon receiving written approval of the City Engineer, a designer may install streetlights on streets with this classification. Streetlights are required at all intersections of local streets intersecting higher classification streets.
B. Streetlights at unsignalized intersections shall be installed near the curb return with the luminaire extending perpendicular to the street centerline. The luminaire shall extend over the continuous roadway at a “T” intersection or over the roadway with the higher classification at a four (4) way intersection. (Ord. 2017-22, Rep&ReEn, 07/05/2017; Ord. 2020-10, Amended, 09/15/2020 (Res. 2020-13))
13-12-003-0002.3 Streetlights at Signalized Intersections
Streetlights shall be installed on the signal poles at signalized intersections as follows:
At a minimum, four (4) streetlights shall be installed, one (1) on each corner of a typical four (4) way intersection. For every leg of an intersection where the width of the leg is greater than or equal to sixty (60) feet, measured at the curb returns, an additional streetlight shall be installed. The additional streetlight shall project over the right hand curb on that approach. In all cases the luminaires shall be placed to provide maximum visibility of pedestrians in the crosswalk by placing equipment to provide positive contrast lighting and by utilizing PCA LED with a Type III distribution. (Ord. 2017-22, Rep&ReEn, 07/05/2017; Ord. 2020-10, Amended, 09/15/2020 (Res. 2020-13))
13-12-003-0003 Spacing of Streetlights
In addition to intersection locations, streetlights shall be spaced along streets in accordance with the following table:
Table 13-12-003-01
Streetlight Spacing
|
FUNCTIONAL CLASSIFICATION |
NO. LANES AT BUILDOUT |
LAND USE AT BUILDOUT |
TYPE |
IESNA DISTRIBUTION |
OUTPUT (LUMENs) NOTE 4 |
SPACING (FEET) |
SINGLE- OR DOUBLE-SIDED |
|---|---|---|---|---|---|---|---|
|
MAJOR ARTERIAL |
2/3 |
RURAL |
NBA |
2 |
6000 |
250 |
SINGLE |
|
|
2/3 |
SUBURBAN/URBAN |
NBA |
2 |
6000 |
200 |
DOUBLE |
|
|
4/5 |
RURAL |
NBA |
2 |
6000 |
250 |
DOUBLE |
|
|
4/5 |
SUBURBAN/URBAN |
NBA |
2 |
6000 |
200 |
DOUBLE |
|
MINOR ARTERIAL |
2/3 |
RURAL |
NBA |
2 |
6000 |
250 |
SINGLE |
|
|
2/3 |
SUBURBAN/URBAN |
NBA |
2 |
6000 |
200 |
SINGLE |
|
|
4/5 |
RURAL |
NBA |
2 |
6000 |
250 |
DOUBLE |
|
|
4/5 |
SUBURBAN/URBAN |
NBA |
2 |
6000 |
200 |
DOUBLE |
|
MAJOR COLLECTOR |
2/3 |
RURAL |
NBA |
2 |
6000 |
250 |
SINGLE |
|
|
2/3 |
SUBURBAN/URBAN |
NBA |
2 |
6000 |
200 |
SINGLE |
|
|
4/5 |
RURAL |
NBA |
2 |
6000 |
250 |
DOUBLE |
|
|
4/5 |
SUBURBAN/URBAN |
NBA |
2 |
6000 |
200 |
DOUBLE |
|
MINOR COLLECTOR |
2 |
RURAL/SUBURBAN |
NBA |
2 |
2000 |
250 |
SINGLE |
|
|
2 |
URBAN |
NBA |
2 |
4000 |
250 |
SINGLE |
|
|
3 |
SUBURBAN/URBAN |
NBA |
2 |
4000 |
250 |
SINGLE |
|
LOCAL (ALL)1 |
2 |
URBAN |
NBA |
1 |
2000 |
300 |
SINGLE |
|
LOCAL CUL-DE-SAC |
2 |
URBAN |
NBA |
3 |
2000 |
N/A |
SINGLE |
Notes:
1. Street lighting on local streets is not required in rural or suburban land use types except at intersections as outlined in Section 13-12-003-0002.2(A)(2). Requests to install street lighting on local streets above the requirements of Table 13-12-003-01 shall be made in writing to the City Engineer per Section 13-06-002-0001.1, Modifications and Appeals. If the requested modification is approved by the City Engineer, the requesting party will be required to provide funding for twenty (20) years of operations and maintenance of the modified lighting system.
2. Major arterials, minor arterials and major collectors shall use thirty-eight (38) foot lighting poles; all other locations shall use thirty (30) foot lighting poles.
3. All thirty-eight (38) foot lighting poles utilize eight (8) foot by eight (8) foot masts; all thirty (30) foot poles utilize twenty (20) inch by six (6) foot masts.
4. Luminaire output is the maintained value based on City of Flagstaff calculations for luminaire depreciation and dirt depreciation expected over the useful life of each arterial and major collector fixture; see the City of Flagstaff specifications for LED luminaires for further information.
(Ord. 2017-22, Rep&ReEn, 07/05/2017; Ord. 2020-10, Amended, 09/15/2020 (Res. 2020-13))
13-12-003-0004 Location and Placement of Streetlights
A. In addition to the criteria in Table 13-12-003-01, the following layout criteria shall be used:
1. When a streetlight location falls near an unlit intersection, the light shall be located at the intersection.
2. Streetlights should be located at property lines to the greatest extent possible, but not in conflict with other utility service locations.
3. Pole spacing along a street may vary from the criteria of Table 13-12-003-01 by up to ten percent (10%). For uniformity of appearance, the variance in spacing between adjacent spans should not be more than ten percent (10%).
4. With relation to roadway cross-sections, poles shall be located as follows (measured to the near edge of the pole):
a. If either the sidewalk is at the back of curb or the parkway is less than four (4) feet wide, two (2) feet from back of sidewalk.
b. When the sidewalk is separated from the curb by a parkway greater than or equal to four (4) feet in width, two (2) feet back of curb.
c. When there is curbing but no sidewalk, two (2) feet from back of curb.
d. On a rural street, eight (8) feet from the edge of pavement.
5. Existing utility poles should not be used whenever possible.
6. Wiring for streetlights shall be underground and located behind curb.
7. Additional lighting may be required when potential traffic hazards are identified in the plan review process. (Ord. 2017-22, Rep&ReEn, 07/05/2017; Ord. 2020-10, Amended, 09/15/2020 (Res. 2020-13))