Miles per hour

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miles per hour
1974 MG MGB GT - Flickr - The Car Spy (14).jpg
Automobile speedometer, indicating speed in miles per hour
General information
Unit system Imperial, United States customary units
Unit of speed
1 mph in ...... is equal to ...
    km/h    1.609344
    kn    0.868976
    ft/s    1.467

Miles per hour (mph, MPH or mi/h) is a British imperial and United States customary unit of speed expressing the number of statute miles covered 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.



50 mph speed limit sign in the United Kingdom UK 50 mph speed limit sign.jpg
50 mph speed limit sign in the United Kingdom
65 mph speed limit sign in the United States 2014-08-19 11 59 11 Speed limit 65 miles per hour sign along northbound Nevada State Route 225 (Mountain City Highway) about 10.9 miles north of Nevada State Route 535 (Idaho Street) in Elko County, Nevada.JPG
65 mph speed limit sign in the United States

Road traffic

Speed limits and road traffic speeds are given in miles per hour in the following jurisdictions:

Rail networks

Miles per hour is the unit also used in the Canadian rail system. [32]

Nautical and aeronautical usage

Nautical and aeronautical applications favour the knot as a common unit of speed. (One knot is one nautical mile per hour, with a nautical mile being exactly 1,852 metres or about 6,076 feet.)

Other usage

In some countries mph may be used to express the speed of delivery of a ball in sporting events such as cricket, tennis and baseball.


1 mph= 0.44704  m/s (exactly)
= 1.609344  km/h (exactly)
≈ 1.467  ft/s (approximately)
0.868976  kn
Conversions between common units of speed
m/s km/h mph knot ft/s
1 m/s =13.62.236936*1.943844*3.280840*
1 km/h =0.277778*10.621371*0.539957*0.911344*
1 mph =0.447041.60934410.868976*1.466667*
1 knot =0.514444*1.8521.150779*11.687810*
1 ft/s =0.30481.097280.681818*0.592484*1

(* = approximate values)

See also

Related Research Articles

Road speed limits are used in most countries to set the legal maximum or minimum speed at which road vehicles may travel on a given stretch of road. Speed limits are generally indicated on a traffic sign reflecting the maximum or minimum permitted expressed as kilometres per hour (km/h) and/or miles per hour (mph). Speed limits are commonly set by the legislative bodies of national or provincial governments and enforced by national or regional police and judicial authorities. Speed limits may also be variable, or in some places unlimited, such as on most of the Autobahn in Germany.

Land speed record the highest speed achieved by a person using a vehicle on land

The land speed record is the highest speed achieved by a person using a vehicle on land. There is no single body for validation and regulation; in practice the Category C flying start regulations are used, officiated by regional or national organizations under the auspices of the Fédération Internationale de l'Automobile. The land speed record (LSR) is standardized as the speed over a course of fixed length, averaged over two runs. Two runs are required in opposite directions within one hour, and a new record mark must exceed the previous one by at least one percent to be validated.

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Railway speed record Wikimedia list article

The world record for a conventional wheeled passenger train is held by France's TGV, set in 2007 when it reached 574.8 km/h (357.2 mph) on a 140 km section of track.

Speed limits in the United States

Speed limits in the United States are set by each state or territory. States have also allowed counties and municipalities to enact typically lower limits. Highway speed limits can range from an urban low of 20 mph (32 km/h) to a rural high of 85 mph (137 km/h). Speed limits are typically posted in increments of five miles per hour (8 km/h). Some states have lower limits for trucks and at night, and occasionally there are minimum speed limits.

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Project V150 Train

Operation V150, where 150 refers to a target speed in metres per second, was a series of high-speed trials carried out on the LGV Est. The V150 was a specially configured TGV high-speed train notable for breaking the world railway speed record on 3 April 2007. The train was built in France and reached a speed of 574.8 kilometres per hour (357.2 mph) on an unopened section of the LGV Est between Strasbourg and Paris, in France topping the previous record of 515.3 kilometres per hour (320.2 mph) set in 1990.

1997–98 South Pacific cyclone season cyclone season in the South Pacific ocean

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Canadian speed limits are set by different levels of government, depending on the jurisdiction under which the road falls, resulting in differences from province to province. The limits have been posted in kilometres per hour (km/h) since September 1, 1977. Before then, when Canada used Imperial units, speed limits were in miles per hour (mph).

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