I agree with Riley's post. Here, in Southern California on the surface streets, the cars seem to cluster and the lights get very rarely tripped by a bike. I'll wait a little, and when I determine that the light sensor is obviously ignoring me, and no cars are there to help me with tripping of the sensor, I just ride across, as soon as the car "peloton" races by. Works pretty well, easier than dealing with highway department bureaurocracy.