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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.
All main countries/regions, except for the United States and the United Kingdom, use the metric system. Some mark this fact by using units on various signs. Note that some smaller English-speaking countries in the Caribbean also use miles per hour. Advisory speed limit signs in most countries list units, although New Zealand does not.
All modern roads and railways are measured, built and signposted in the metric system. All the imperial speed limit signs were replaced within 3 days in 25 August 1984 to 27 August 1984 upon enactment of new traffic law, with a temporary territory-wide speed limit of 50 km/h in force within that 3 days, while all remaining road signs were gradually replaced within the following 3 years.
Different speed limits exist for heavy goods vehicles (HGV) but the limit for HGV is country dependent: while most Eurasian and American countries might use the Vienna convention's 3.5-tonne limit, other countries in North America, China, India, Australia or Ireland might use different weight limits.
The former Weights and Measures office in Seven Sisters, London (590 Seven Sisters Road). The imperial system of units, imperial system or imperial units (also known as British Imperial [1] or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments.
However, derived units such as miles per hour or miles per gallon continue to be abbreviated as "mph" and "mpg" rather than "mi/h" and "mi/gal". In the United Kingdom, road signs use "m" as the abbreviation for mile though height and width restrictions also use "m" as the symbol for the metre, which may be displayed alongside feet and inches. [6]
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Imperial units were mostly used in the former British Empire and the British Commonwealth, but in all these countries they have been largely supplanted by the metric system. They are still used for some applications in the United Kingdom but have been mostly replaced by the metric system in commercial, scientific, and industrial applications.