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They are triggered by a system called a Henry Loop. Steel disrupts the constant looping and tells the light to change. I have had decent luck with a stop light trigger magnet, but in VA we are allowed to run it if it does not change AND if its safe after 2 cycles? My Adly has steel wheels so it trips them and my Burgmans low enough so it trips them to. I have heard that electric current can trip lights also. Thats why you see some bikes flash their high beams at a light while waiting all by themselves.
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