Irregularities Not Based On The Zoning System
| Road Number | Location | Reason |
|---|---|---|
| A135 | Stockton-on-Tees | The other A13x roads are in southern England. |
| A139 | Stockton-on-Tees | The other A13x roads are in southern England. |
| A176 | Basildon, Essex | The other A17x roads are in North Yorkshire or County Durham. |
| A180 | Grimsby | The other A18x roads are in the North-east. The A180 is numbered as an extension of the M180. |
| A249 | Maidstone - Sheerness, Kent | The other A24x roads are in Surrey. |
| A403 | Avonmouth, South Gloucestershire | The other A40x roads are in or around Greater London |
| A437 | Hillingdon, Greater London | The other A43x roads are in Gloucestershire, Oxfordshire or Warwickshire. |
| A491 | Bromsgrove - Stourbridge | The other A49x roads are in North Wales. |
| A500 | Stoke-on-Trent "D"-road | The other A50x roads are in London, southern England and Northamptonshire |
| A506 | Liverpool | The other A50x roads are in London, southern England and Northamptonshire |
| A594 | one in Cumbria, one in Leicester | There are two A594s which are clearly separate roads. The Cumbria version predates the Leicester version. |
| A598 | Barnet, Greater London | The other A59x roads are in Cumbria (but see A594 above) |
| A601(M) | Carnforth, Lancashire | "A601(M)" would be a designation for an upgraded section of the A601. The A601 is a completely different road in Derby. |
| A1042 | one in Redcar, one in Norwich | There are two A1042s which are clearly separate roads. The Redcar version predates the Norwich version. |
| A1114 | one in Chelmsford, one in Gateshead | There are two A1114s which are clearly separate roads. |
| A1199 | one in Islington, one in Woodford (both in Greater London) | There are two A1199s which are clearly separate roads. |
Read more about this topic: Anomalously Numbered Roads In Great Britain
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