You don’t need police to enforce speed laws. You just need cameras, which have the advantages of being cheaper and safer. There are two kinds of speed camera s

You don’t need police to enforce speed laws. You just need cameras, which have the advantages of being cheaper and safer. There are two kinds of speed camera systems. One uses two cameras in short succession to measure instantaneous speed. You can dodge this by slowing down right before it. The second uses the same concept but puts the cameras a mile or so apart to measure duration over that distance. This is harder to game.