Anomalously numbered roads in Great Britain on:
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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 run in a complete circle, starting in Zone 2, and proceeding clockwise through zones 3, 4 and 1. The
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
Oddities and anomalies
– Chris Marshall, archived in 2015 {{DEFAULTSORT:Anomalously Numbered Roads In Great Britain Lists of roads in the United Kingdom
Great Britain road numbering scheme
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 (between 1 and 4 digits). ...
, 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 run in a complete circle, starting in Zone 2, and proceeding clockwise through zones 3, 4 and 1. The A282
The Dartford-Thurrock River Crossing, commonly known as the Dartford Crossing and until 1991 the Dartford Tunnel, is a major road crossing of the River Thames in England, carrying the A282 road between Dartford in Kent in the south and Thurr ...
, 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 {{DEFAULTSORT:Anomalously Numbered Roads In Great Britain Lists of roads in the United Kingdom