I think "stracing" is right about the signs for a mobile police cars, but I have NEVER seen any cop with a sign.
Look at the Gumball videos and you will know that no cop in whichever country had any sign to warn the drivers. (otherwise non of the gumballers would have got any tickets)
These rubbish bin speed cameras will work by placing two adjacent cables on the road a few meters in front, it will measures the speed by how fast it took the car to cross each cable. I am sure all of you have seen it.
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lier, lier, pants on fire
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