New device gives you green lights on a bike
This new device claims to fix this by emitting a frequency to match that of the inductive sensor.
The inventor claims that this is more effective than using a magnet like blacksmith_tb does or Kipkay does. Commentors on the site seem equally skeptical and point out that similar products have already been on the market for several years.
As for myself, I don't feel like adding what looks like a decent amount of weight to my bike for such an occasional problem that I'll just ride past anyway. What do you think?