Quote:
Originally Posted by worth
radar detector ftw
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I'm pretty sure the speed is recorded by the sensors embedded in the asphalt. It's a loop of wires under the road that can tell when a car is moving through (ie. if the car is moving into the intersection when the light is red). these loops can also very accurately detect how long the vehicle is inside the loop (ie. it's speed).
no radar. no new infrastructure.
In fact, I think the accuracy might be even better than radar.