Traffic signal reference wheel

Published Aug. 11, 2010 at 9:06 p.m.
Most “traffic actuated” traffic signals in California are triggered through electromagnetic detectors embedded in the road surface. They’re simply large metal detectors that detect the presence of a vehicle by inducing a magnetic field in them. They work well when there’s a large, horizontal metal surface over them, like you have in cars and trucks. [...]Related posts:
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