Whenever an illuminated flashing red or yellow signal is used in a traffic sign or signal placed or erected in the city, it shall require obedience by vehicular traffic as follows.
(A) Flashing red (stop signal). When a red lens is illuminated with intermittent flashes, drivers of vehicles shall stop before entering the nearest crosswalk at an intersection or at a limit line when marked, or if none, 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.
(B) Flashing yellow (caution signal). When a yellow lens is illuminated with intermittent flashes, drivers of vehicles may proceed through the intersection or past the signal only with caution.
(1989 Code, § 15-508, modified)