The other thought, assuming it does make the other lights turn red very fast, is that it could be used maliciously to stop drivers who you didn't like/your mates who took the "short cut" etc. I admit sometimes I wait at a pedestrian crossing and press the button at the approach of a car that is driving recklessly, just to annoy the driver! Ok, I'm a heartless bas*ard, but it's fun!
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