Just carry a long stick to poke the sensor
Traffic Signals are most commonly controlled by electromagnets (also referred to as Inductive Loops), which are buried just under the black lines you see cut into the surface of the road at each lane of controlled intersections - they usually appear as large, black-outlined rectangles in the road.
Pretty much it detects the iron in vehicles. Problem is that motorcycles just arent big enough to trip them.
Solution:
http://www.signalsorcerer.com/
http://www.bikerhiway.com/index.php?mai ... edium=frgl
http://www.greenlightstuff.com/
http://www.light-changer.com/