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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.
Road speed limits in the United Kingdom are used to define the maximum legal speed (which may be variable) for vehicles using public roads in the UK. Speed limits are one of the measures available to attempt to control traffic speeds, reduce negative environmental effects of traffic, increase fuel use efficiency and satisfy local community wishes.
In 1978 the cost of converting road signs from miles to kilometres in the United Kingdom was estimated to be between £7.5 million and £8.5 million. [100] In 2005 The Department for Transport (DfT) costed the replacement of all of the United Kingdom's road signs in a short period of time at between £565 million and £644 million. [101]
British roads are limited for most vehicles by the National Speed Limit.Road signs in the UK use imperial units, so speed limits are posted in miles per hour.Speed limits are the maximum speed at which certain drivers may legally drive on a road rather than a defined appropriate speed, and in some cases the nature of a road may dictate that one should drive significantly more slowly than the ...
A non-primary road sign near Bristol shows Guildford Rules patches.Road signs in the United Kingdom and in its associated Crown dependencies and overseas territories conform broadly to European design norms, with a number of exceptions: direction signs omit European route numbers, and road signs generally use the imperial system of units (miles and yards), unlike the rest of Europe (kilometres ...
The United Kingdom has a well developed and extensive network of roads totalling about 262,300 miles (422,100 km). Road distances are shown in miles or yards and UK speed limits are indicated in miles per hour (mph) or by the use of the national speed limit (NSL) symbol.
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.
Highest-posted speed limits around the world. 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.