Motorcycle rights group supports stop-look-go legislation.

those magnets are probably for atracting metal shavings from normal wear and tear. it keeps them out off the normal oil flow to try to keep wear down, like a magnetic drain plug. as for the trafic lights I have allways heard they are a magnetic resonance detector, and since new motorcycles especially are made primarily of non ferrous items souch as alluminum amd magnesium they just don't carry enough of a flux to trip the device. a strong magnet is supposed to make all the difference though.