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In page Imperial units:

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Road signs give distances in miles and yards and speed limits in miles per hour.[7] Height and width restriction signs are given in feet and inches, with metric equivalents required on new signs since March 2015.[8] Vehicle speedometers must be able to display miles per hour,[9] and fuel economy is commonly quoted in miles per gallon.[citation needed] Tyre pressures are commonly given in pounds per square inch, usually alongside bar.[10] On the national rail network, locations such as bridges and junctions are identified by their distance in miles and chains from a fixed origin.[11]