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Speed limit sign in the Republic of Ireland, using "km/h.". The SI representations, classified as symbols, are "km/h", "km h −1" and "km·h −1".Several other abbreviations of "kilometres per hour" have been used since the term was introduced and many are still in use today; for example, dictionaries list "kph", [3] [4] [5] "kmph" and "km/hr" [6] as English abbreviations.
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.
Speed; system unit code (alternative) symbol or abbrev. notes sample default conversion combinations SI: metre per second: m/s m/s US spelling: meter per second 1.0 m/s (3.3 ft/s)
mph (mi/h) knot fps (ft/s) 1 m/s = 1: 3.600 000: 2.236 936 * 1.943 844 * 3.280 840 * 1 km/h = 0.277 778 * 1: 0.621 371 * 0.539 957 * 0.911 344 * 1 mph (mi/h) = 0.447 ...
1.15078 miles per hour (approximately), 20.25372 inches per second (approximately) 1.68781 feet per second (approximately). The length of the internationally agreed nautical mile is 1 852 m. The US adopted the international definition in 1954, having previously used the US nautical mile (1 853.248 m). [6]
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 ]
Kilometres per hour are on the left and miles per hour on the right.* A speed limit is the limit of speed allowed by law for road vehicles, usually the maximum speed allowed. Occasionally, there is a minimum speed limit. [ 1 ]
The Light Locomotives on Highways (Ireland) Order 1896 then set a maximum national speed limit of 12 mph (19 km/h) with a speed limit of 6 mph (9.7 km/h) for traffic in villages, towns and the Dublin Metropolitan Police District. Vehicles weighing more than 2 tons (unladen) were restricted to 5 mph (8.0 km/h) in these areas.