Whenever flashing red or yellow signals are used in a traffic sign or signal they 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 with rapid intermittent flashes, drivers of vehicles may proceed through the intersection or past the signal only with caution.
(Prior Code, § 71.108) Penalty, see § 71.999