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Kilometres Per Hour

]] The kilometre per hour is a unit of speed, expressing the number of kilometres travelled in one hour. The unit symbol is km/h or km·h. Worldwide, the km/h is the most commonly used speed unit on road signs and car speedometers. Along with the kilowatt hour, km/h is the most commonly used metric unit based on the hour, although the "hour", while not an SI unit, is accepted for use with the International System of Units by the International Bureau of Weights and Measures (BIPM).