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, 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 by rapid intermittent flashes, drivers of vehicles may proceed through the intersection or pass such signal only with caution. (WVaC 17C-3-7; 1947 Code §19.25)