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Numbering principles :

There is sometimes confusion about the separate numbering schemes for A-roads, B-roads and motorways within Great Britain. To the uninitiated, it may seem illogical to have the A275 in Sussex, the B275 in south London and the M275 in Portsmouth. This article attempts to set out the principles on which the three systems of numbering were originally developed, as well as explaining some of the changes to the system that have subsequently taken place.

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