Some call it "traffic calming," others call it law enforcement. The police get high-tech speed-trap gear like lidar and VASCAR, while others โ€” like homeowners and various safety groups โ€” find their own sneaky techniques. What's the cleverest way to get drivers to slow down?

A few holiday seasons ago in Orange County, California, a police officer dressed as one of Santa's elves manned a radar gun at the side of the road. Likely assuming the elf was one of those roadside hawkers promoting mattresses for $99, drivers didn't bother slowing down, and were picked off one-by-one. (Those pothole stickers? They're a hoax.)

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