Motorway-linked Renumberings

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Often, when a motorway opens, a lot of renumbering occurs in order to meet the junctions/dissuade people from using roads. Here are some of the more major ones, that have renumbered many roads.

M25 and A1(M) completion 1986

Old Number Route New Number Notes
A1 junctions 2 to 4 A1(M)/A1001 rebuilt as motorway + LAR
A5 Brockley - Friars Walsh A5183
A6 South Mimms - London Colney M25 / B556 online upgrade with partial LAR
A6 London Colney - Luton A1081
A111 South Mimms - Potters Bar B556
A405 Park Street Roundabout - Hatfield A414
A412 Chiswell Green - St Albans B4630
A414 Hemel (A4147) - St Albans A4147
A414 St Albans - Hatfield A1057
A4147 Hemel (A414) - M1 A414
A6129 Stanborough - Luton B653
B197 South Mimms - Colney Heath unclassified
B556 London Colney - Hatfield unclassifed
B6426 St Albans - Colney Heath unclassified

M40 completion

Old Number Route New Number Notes
A34 Peartree - Chipping Norton A44
A34 Chipping North - M42 A3400
A41 Bicester - Adderbury B4100
A41 Adderbury - Banbury A4260
A41 Banbury - Bishops Tachbrook B4100
A41 Bishops Tachbrook - junction 14 A452
A41 junction 14 - 15 M40 online doubling of Warwick bypass
A41 Warwick - Five Ways A4177
A41 Five Ways - M42 A4141
A43 Wolvercote - Peartree A44
A43 Peartree - Weston-on-the-Green A34
A43 Weston-on-the-Green - Ardley B430
A421 Weston-on-the-Green - Wendlebury A34
A421 Wendlebury - Bicester A41
A423(M) Maidenhead bypass A404(M) linked with the A404 scheme dating to about the same time
A423 Maidenhead - Wallingford A4130
A423 Wallingford - Oxford A4174
A423 Oxford - Adderbury A4260


M11 completion

Old Number Route New Number Notes
A11 Waterworks Corner to Wake Arms Roundabout A104
A11 Wake Arms Roundabout to Hastingwood Interchange B1393 This occurred after the M11 was opened.
A11 Harlow A414 This occurred after the M11 was opened.
A11 Harlow to Hockerill Cross, Bishop's Stortford A1184 This occurred after the M11 was opened.
A11 Hockerill Cross, Bishop's Stortford to Stump Cross B1383 This occurred after the M11 was opened.
A130 Stump Cross to Cambridge A1301
A130 Great Dunmow to Stump Cross B184
A10 Cambridge A1134 and A1309
A122 near Epping A1161 Subsequently, this was classified as B181
unclassified near Epping A122



Motorway-linked Renumberings
Historical Information
1922 Road Lists Class IZone 1 • Zone 2 • Zone 3 • Zone 4 • Zone 5 • Zone 6 • Zone 7 • Zone 8 • Zone 9 • Northern Ireland
1922 Road Lists Class IIZone 1 • Zone 2 • Zone 3 • Zone 4 • Zone 5 • Zone 6 • Zone 7 • Zone 8 • Zone 9 • Northern Ireland
1935 Road numbering revisionZone 1 • Zone 2 • Zone 3 • Zone 4 • Zone 5 • Zone 6 • Zone 7 • Zone 8 • Zone 9
Mass renumbering schemes1922 Draft Road Lists • 1924 A1 Renumbering • 1920s South Buckinghamshire Renumbering • 1933 A30 Renumbering • 1933 Scotland Renumbering Proposals • 1934 A82 Renumbering • Tyneside Renumberings • Motorway linked Renumberings • Republic of Ireland T and L roads
Network Changes1700-1799 • 1800-1899 • 1900-1909 • 1910-1919 • 1920-1929 • 1930-1939 • 1940-1949 • 1950-1959 • 1960-1969 • 1970-1979 • 1980-1989 • 1990-1999 • 2000-2009 • 2010-2019