• Source: Anomalously numbered roads in Great Britain

    • In the Great Britain road numbering scheme, the country is divided into numbered zones, the boundaries of which are usually defined by single-digit roads. The first digit of a road's number should be the number of the zone it occupies. If the road occupies multiple zones, then the furthest-anticlockwise zone is the correct one. The following tables list all British roads which are anomalously numbered. Roads in bold lie completely outside their "correct" zone; all other roads run for some length in their "correct" zones but trespass into zones anticlockwise of this zone. A further table lists duplicated road numbers.


    Motorways


    The motorway zone boundaries are different from the A-road boundaries.

    While the M25 may appear to contradict these rules as it runs through all the London-bound zones, it in fact does not: it does not quite form a complete circle. It starts in Zone 2, south of the Thames, and proceeds clockwise through zones 3, 4 and 1. The A282, which completes the circle mostly formed by the M25, is anomalously numbered; as it proceeds into the A-road 1-zone (and should therefore begin with a 1).
    The M271 is numbered as a spur of the M27, as opposed to the traditional numbering rules; however the M3 to Southampton came after the M271 was built and is not the zone boundary, which appears to be a straight line from M3 J8 to Exeter in some documentation.


    A roads




    B roads




    Irregularities not based on the zoning system




    Two clearly separate roads with the same number




    References



    Out-of-Zone Roads (from which most of the information on this page is taken)
    The SABRE Wiki A comprehensive database of numbered roads in Great Britain and Ireland
    UK Roads - Numbering Quirks Lists of duplicated road numbers, out-of-zone roads and more


    External links


    Oddities and anomalies – Chris Marshall, archived in 2015

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