Whenever an illuminated flashing red or yellow signal is used in conjunction with an official traffic-control device, it shall require obedience by vehicular traffic as follows:

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1.  When a red lens is illuminated with rapid intermittent flashes, drivers of vehicles shall stop before entering the nearest crosswalk in 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 required stop.

2.  When a yellow lens is illuminated with rapid intermittent flashes, drivers of vehicles may proceed past such signal and through the intersection or other hazardous location only with caution.