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Driver location sign
Driver location signs are signs placed every along each side of English motorways, and some other major English roads, to provide information that will allow motorists to know their precise location. Neither Scotland, Wales or Northern Ireland use these signs. This information might be useful in the event of an emergency or breakdown. They were first introduced in 2003, and they complement distance marker posts (small roadside posts used for road maintenance and administrative purposes). Both types of sign display a unique location number. The number, although given without units, is the distance in kilometres from a designated datum location for the road.
While the driver location signs are metric, other road signs throughout the UK use imperial measurements (miles and yards).
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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