i thought they could monitor speed.....
thats why i wear tinfoil..
That's what we were always told growing up.
Then, a friend of mine brought up how it would be impossible to measure the speed of a car by measuring the time between the front tires and the back tires of a car going 65 plus mph.
When I was a new driver though, I would always slow down if I saw one. Like as if there were a cop sitting there measuring it.