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When you pass an electric current through a metal wire loop, you induce a magnetic field around it, and cause it to resonate at a set frequency. There are lots of options for detecting vehicles, but the most common sensor is the inductive loop, which makes use of the relationship between electricity and magnetism. So, a brief summary: Traffic lights, controlled by computers, take in data from sensors embedded in the road. Now, while I’ve previously written about the complex maths behind traffic flow, I’ve never told you how traffic is managed, and that is particularly important for pedestrians. But at any other sort of traffic-pedestrian interface, what the button does depends on where you are, what time it is, and what type of crossing you’re at. It seems that if you’re at a standalone pedestrian crossing that is far from any other sort of traffic junction, pushing the button will turn the traffic light red. Unfortunately, I can’t do that, because there is no definitive answer.
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