So I bought this device recently from
J.C. Whitney (THE place we used to buy parts for VW beetles) called the
Signal Sorcerer. It is supposed to be a little device that helps small vehicles to be sensed by electro-magnetically triggered traffic light stops.

It is essentially a small powerful magnet that you mount to the underside of your motorcycle, scooter, ATV, or bicycle. The instructions dictate that you should mount it to a flat surface, parallel to the road, and in-line with the direction of travel. I mounted mine to this part just in front of the kickstand. It is just about the closest part to the ground, save for the exhaust.

As you can see, it's basically a small magnet bar on a foam strip with 2-sided glue. It comes in a small tube, although I've seen differing models that look like little red boxes. After I attached it for 24 hours, you can see that the magnet has pulled itself to one side of the glue strip to make love with the bike chassis. I'm not sure if I want to correct this, but I do know that with it touching the metal, the magnet will discharge faster.
I bought it to try it out on a particular light that never triggers for me until a vehicle comes up behind me. When I tried it out recently, it did not work. I am holding out hope though, because there were no scores in the road that are evidence of the sensor. There are some marked sensors in this town that do not trigger for me either, and I will be testing how they work now.