I just got a sport bike which the frame is aluminum the engine is aluminum the swing arm as well. Basically this bike is made up of mainly Aluminum and Plastics with very little steal or any other metals. I have ran into the age old problem of getting caught at traffic lights and not triggering the sensors in the pavement. My understanding of how those sensors work is they are nothing more than just a large metal detector and since Aluminum and plastic doesn't do good with metal detectors I get stuck at the lights waiting for days for it to change or hoping a car or truck pulls up to trigger the light.

My resolution to this is to mount a 20kg pull electro magnet to the bike and turn it on while sitting on top of the sensors to trigger them.

So here is my question to this (multi-part) Is this just a moronic thing to even attempt and a waist of time? If it is not a waist of time than do I have to worry about shielding the magnetic field so that it only goes downwards. I'm Afraid the strength of the magnet may cause issues with the electronics on the bike, but I may just not fully understand electronics and magnets (which is why I am here)

Sorry for my long winded question I am providing a link to the electromagnet I have below.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270624517539

I just got a sport bike which the frame is aluminum the engine is aluminum the swing arm as well. Basically this bike is made up of mainly aluminum and plastics with very little steel or any other metals. I have run into the age old problem of getting caught at traffic lights and not triggering the sensors in the pavement. My understanding of how those sensors work is they are nothing more than just a large metal detector and since aluminum and plastic don't do well with metal detectors, I get stuck at the lights waiting for days for it to change or hoping a car or truck pulls up to trigger the light.

My solution to this is to mount a 20kg pull electromagnet to the bike and turn it on while sitting on top of the sensors to trigger them.

So here is my question to this (multi-part) Is this just a moronic thing to even attempt and a waste of time? If it is not a waste of time, then do I have to worry about shielding the magnetic field so that it only goes downwards? I'm afraid the strength of the magnet may cause issues with the electronics on the bike, but I may just not fully understand electronics and magnets (which is why I am here).

Sorry for my long winded question I am providing a link to the electromagnet I have below.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270624517539