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 Everyday Examples
 Speed:  The rate of motion, measured in distance/time.
Speed limit signs are represented in miles per hour. On this sign, the speed limit, or rate of motion limit, is 55 miles per hour. The minimum speed one is supposed to drive is 45 mph.

Speed Limit

Photo copyrighted by Richard C. Moeur. Visit Richard C. Moeur's site to see more traffic sign shapes.