FWIW For a loop of wire to "detect" metal, there must be motion. It is the car passing over/into the loop which generates a current in the wire. This current is then sensed. Hence, it doesn't matter where the bike stops. If it has enough metal to generate the required current to set off the sensors, it will do so when the bike enters the loop. -Gary G. --- In dmcnews@xxxxxxxxxxx, "Tom Niemczewski" <tomcio@xxxx> wrote: > Hi, I hope this will close this thread once and for all!! > > Here in Florida we have metal detectors on every intersection! They sense > that a car is waiting for a green light and change the lights. BUT I > intentionally said METAL detectors. Who had the idea that those are iron > detectors?