Provides that, notwithstanding any provision of law to the contrary, the operator of a street legal motorcycle approaching a left turn intersection that is controlled by a triggered traffic control signal using a vehicle detection device that is inoperative due to the size of the street legal motorcycle shall come to a full and complete stop at the intersection. If the left turn signal fails to operate after one cycle of the traffic signal, the operator may, after exercising due care, proceed to turn left.

Provides that it is not a defense to a violation of RCW 46.61.050 that the driver of a motorcycle proceeded under the belief that a traffic control signal used a vehicle detection device or was inoperative due to the size of the motorcycle when the signal did not use a vehicle detection device or that any such device was not in fact inoperative due to the size of the motorcycle.