Originally Posted by
ChicagoNative
The light sensors are wires buried in the pavement, which basically 'see' the metallic mass of a cars magnetic field. Get a couple of the really strong rare-earth / neodymium magnets and attach them to the bottom of the bike frame.. The same trick works on motorcycles, many of which also don't trip the sensors. ;-)
if they're properly set up, they should trip from a bike rim. Not a bike. Not even a whole wheel. Just the hoop. Complain to the people responsible for the light.