M40 | ||||
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Route information | ||||
Part of ![]() | ||||
Maintained by National Highways | ||||
Length | 89 mi (143 km) | |||
Existed | 1967–present | |||
History | Opened: 1967 Completed: 1991 | |||
Major junctions | ||||
Southeast end | Denham | |||
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Northwest end | Tanworth in Arden | |||
Location | ||||
Country | United Kingdom | |||
Counties | Buckinghamshire, Oxfordshire, Northamptonshire, Warwickshire | |||
Primary destinations | ||||
Road network | ||||
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![]() | It has been suggested that M40 corridor be merged into this article. (Discuss) Proposed since August 2024. |
The M40 motorway links London, Oxford, and Birmingham in England, a distance of approximately 89 miles (143 km).
The motorway is dual three lanes except for junction 1A to junction 3 (which is dual four lanes) a short section in-between the exit and entry slip-roads at junction 4 (which is two lanes in both directions) and also between the slip-roads at junction 9 (in the south-eastbound direction only).
An Active Traffic Management system operates on the short section north-westbound from junction 16 (A3400) to the M42.
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