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(A) 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:
(1) 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.
(2) Flashing yellow caution signal. When a yellow lens is illuminated with rapid intermittent flashes, drivers of vehicles may proceed through the intersection or pass the signal only with caution.
(B) This section shall not apply to railroad grade crossings.
(47 O.S. § 11-204) (`90 Code, § 20-26)