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:
(A) 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 none, then before entering the intersection. 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 with rapid intermittent flashes, drivers of vehicles may proceed through the intersection or past the signal only with caution.
('88 Code, § 18.234.6)