§ 70.24  FLASHING SIGNALS.
   Whenever flashing red or yellow signals are used they shall require obedience by vehicular traffic as follows:
   (A)   Flashing red stop signal.  When a red lens is illuminated by rapid intermittent flashes, drivers of vehicles shall stop before entering the nearest crosswalk at an intersection or at a limit line when marked, 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.
('72 Code, § ll-14)  Penalty, see § 70.99