Quote:
Originally Posted by skins
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.
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That sensor is an inductive loop which completes the circuit when a car is on top of it changing the light like you said.
The infastructure is already in place with the red light cameras, they will add a Ka band radar station with every red light camera.
The inductive loop you see on the road has nothing to do with clocking speed, and it's not in parallel, it's a circuit, or a rectangle. you can see them at the intersection of 84th street and glenmore trail se. they mark the spot and come back to install the loop after the asphalt has been laid.
do you guys have any documentation that the inductive loop determines speed, because I have never heard of this before...