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References. Miles per hour ( mph, m.p.h., MPH, or mi/h) is a British imperial and United States customary unit of speed expressing the number of miles travelled in one hour. It is used in the United Kingdom, the United States, and a number of smaller countries, most of which are UK or US territories, or have close historical ties with the UK or US.
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Miles per hour is the unit used for speed limits on roads in the United Kingdom and the United States. It is normally abbreviated in everyday use to or . In technical publications it is sometimes abbreviated as . The SI unit for velocity (speed, with a direction of movement) is m·s −1 (metres per second).
Apr 13, 2017 · Major streets in cities usually have posted speed limits between 30 and 45 miles per hour. Most country roads have default speed limits of 55 miles per hour (50 miles per hour in New Jersey, Rhode Island, Vermont, and Washington; 45 miles per hour in Puerto Rico). Wikipedia has more details.
Miles per hour is a common unit of speed in the Imperial system of units used in the UK and the USA. Previously this system was used in all the major English speaking nations of the world (Canada, Australia, New Zealand and South Africa), although it was replaced with metric system in most countries during the second half of the twentieth century.
