If I had say a dozen or so small bar magnets and I wanted to used them to trip the traffic light sensors (which are a coil embedded in the road where a vehicle would stop for the lights), what would be the best layout? Would it be best to put them all end-to-end to create one long 'super' magnet? Or should I separate them into say a 3 by 4 grid with them all orientated the same way? Or is there some other optimal layout?
By 'optimal layout' I mean, 'most likely to trip the sensor', which I'm guessing is the same as, 'would induct the most current in the sensor coil'.