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Lot of you have probably seen from time to time how cops will put out those portable LED radar units that they stick on the side of the roads every now and then. They also have permenantly mounted ones on some poles.
Well anyways, the way they seem to work is if they don't detect any movement the LED's are off and when a car comes by it turns on and displays the vechicles speed.
There's one up the street from me and I go by it quite often and I have to say 7 out of the 10 times I go by it, it stays off because it can't detect me or can't read my speed.
I'm guessing because I'm such a small object compared to a car that it can't detect me. I was wondering if the same phenomenon happens with radar guns state troopers use when in their cars.