Kilometres per hour

Speed limit in km/h on a road in Denmark

Kilometres per hour is a unit of measurement, which measures speed or velocity. The unit symbol is km/h or km·h−1. By definition, an object travelling at a speed of one km/h in a straight line for one hour moves one kilometre. The unit is the most commonly used unit of speed worldwide, more common than the SI unit of speed, metres per second.

Speed limit units on traffic signs around the world:
  Kilometres per hour (km/h)
  Miles per hour (mph)
  Both
  No speed limit units

Kilometres per hour

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