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Is my speedometer right, or is the speed checker thingy on the highway right?

Asked by Dutchess_III (46858points) September 25th, 2015

When you come back into town on the highway, the speed limit drops to 55 mph, and they have a speed checker on the side of the highway that lights up and tells you how fast you’re going. The speed check consistently shows me as going 5 mph less than my speedometer. I’ve passed it a thousand times, always checking to see if other cars are around to trip it. I’ve passed it all alone, lots. So, which is right?

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