The text
Whenever an illuminated flashing red or yellow signal is used in a traffic sign or signal, it shall require obedience by vehicular traffic as follows: (1)
Flashing red (stop signal). When a red lens is illuminated with rapid intermittent flashes, drivers of vehicles shall stop before entering the nearest crosswalk at an intersection or at a limit line when marked, or, if not, then before entering the intersection, and the right to proceed shall be subject to the rules applicable after making a stop at a stop sign.
(2)
Flashing yellow (caution signal). When a yellow lens is illuminated with rapid intermittent flashes, drivers of vehicles may proceed through the intersection or past such signal only with caution.
(3)
Flashing green (pedestrian signal). When a green lens is illuminated with rapid intermittent flashes, drivers of vehicles may proceed through the intersection or crosswalk past such a signal only with caution.
(Code 1971, § 22-43)