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Interesting experience the other day, which may bear on this some.

The local police have set up one of their radar trailers on a street near my home. When I come out of the alley and turn on to the street, the radar registers 11 or 12 mph, and then I speed up to 29 mph and head down the block. One day last week a car was coming down the street the other direction and as we approached each other, the radar registered 55 mph for a period of time as the vehicles approached each other, and then dropped to 29 mph as we passed each other and I became the sole target. I suspect that what the radar was seeing was a double bounce, off my car and his, adding the two speeds.