Reply #8: First, the sensors don't detect "weight" they are magnetic coils which detect iron.

[lumberjack_jeff]

A motorcyclist learns quickly to stop in the coil. Bikes with an insufficient amount of iron for the system to sense will sit indefinitely. Worse, since they occupy the coil, it can't detect the magnetic signature of the car which pulls up behind the bike. So EVERYONE sits indefinitely, until the angry car operator rams the bike out of the way.

It's a reasonable law.

Any motorcycle operator which puts the law above his or her own safety is a statistic. If you're stuck in one of these lights, you go at the first safe opportunity whether the law allows you to or not.