M40 motorway

M40 shield
M40
Route information
Part of E05
Maintained by National Highways
Length89 mi (143 km)
Existed1967–present
HistoryOpened: 1967
Completed: 1991
Major junctions
Southeast endDenham
Major intersections
Northwest endTanworth in Arden
Location
CountryUnited Kingdom
CountiesBuckinghamshire, Oxfordshire, Northamptonshire, Warwickshire
Primary
destinations
Road network
M32 M42

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.