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Why do roads have speed limits rather than velocity limits
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Why do roads have speed limits rather than velocity limits

User Pherris
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Speed is the rate at which something moves. Velocity is both speed and direction. Basically, having a velocity limit would mean only that you couldn't exceed a speed in a certain direction. Speed limits restrict speed in all directions because no direction is specified.
User Jfrohn
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Speed is the rate at which something goes, and velocity is the average acceleration, which means a car can go slow for a bit, and fast for a bit, and have a velocity of medium. Also, speed is much easier to measure. 
User Mario
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