The Great Britain road numbering scheme is a numbering scheme used to classify and identify all roads in Great Britain. Each road is given a single letter, which represents the road's category, and a subsequent number, with a length of between 1 and 4 digits. Originally introduced to arrange funding allocations, the numbers soon became used on maps and as a method of navigation. Two schemes exist: one for motorways, and another for non-motorway roads.
The scheme applies only to England, Scotland and Wales. Alternative systems are used in Northern Ireland (see Roads in Northern Ireland), the Isle of Man (see Roads in the Isle of Man), Jersey, Guernsey, and British overseas territories. All of these numbering schemes use identical basic conventions and road-sign designs.
Read more about Great Britain Road Numbering Scheme: History, Other Classifications, Ancient Roads
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