Special right or left turn movements may be provided when approved by the director at intersections where traffic is controlled by traffic control signals, by incorporating an additional lens in the signal. This additional lens shall be a green arrow lens and shall designate the special right or left turn movement by the direction of the arrow.
When a green arrow lens is incorporated in a traffic control signal and the signal is operating to control traffic at an intersection, vehicles shall make turning movements in the direction of the arrow only when the lens is illuminated.