When a traffic signal displays a circular green light and a green arrow at the same time, the driver of the vehicle facing such signal shall comply with the circular green light as if it were shown alone, except that the driver of a vehicle facing such signal and making a turning movement shall cautiously enter the intersection from the proper lane to make the turning movement indicated by the green turn arrow. The driver of a vehicle making such turn shall yield the right-of-way to pedestrians lawfully within the crosswalk and to other traffic lawfully using the intersection. (Code 1962, § 37-21.04)