M40 motorway

The **M40 motorway** is a motorway between Denham, near London; and Solihull near Birmingham in England. It also goes through Oxford. It was built in stages between 1967 and 1991 and is  long.

## Junctions

|scope=col|mile|scope=col|km|scope=col abbr="Southbound"|Southbound exits (B carriageway)|scope=col|Junction|scope=col abbr="Northbound"|Northbound exits (A carriageway)|scope=col|Coordinates|
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|colspan=6|**M40 motorway**|||||||||||
|rowspan="2"|18.1|rowspan="2"|29.2|_End of motorway_ _Road continues as A40 to London_|rowspan="2"|J1|_Start of motorway_ _Road formed from main carriageways of A40 from London_|rowspan="2"|<small></small>|||
|Slough A412 Uxbridge A4020 _Non motorway traffic_||||||||||||
|19.9 20.4|32.0 32.9|Watford (M1) Heathrow Airport (M4) (M3, M23, M11) M25|J1a|Watford &(M1) Stansted Airport (M11) Heathrow Airport (M4) Gatwick Airport (M23)  M25|<small></small>|||||||
|24.8 25.3|39.9 40.7|Beaconsfield, Amersham, Slough A355, _Beaconsfield services Extra_|J2 _Services_|Beaconsfield, Amersham, Slough A355, _Beaconsfield services Extra_|<small></small>|||||||
|27.8 28.1|44.7 45.2|No access|J3|Loudwater and High Wycombe (East) A40|<small></small>|||||||
|31.3 31.6|50.3 50.9|High Wycombe, Marlow, Maidenhead A404 (M4)|J4|High Wycombe, Marlow A404 (M4)|<small></small>|||||||
|38.9 39.3|62.6 63.2|High Wycombe (West), Stokenchurch A40|J5|Stokenchurch A40|<small></small>|||||||
|41.4 41.8|66.7 67.2|Watlington, Princes Risborough B4009|J6|Thame, Watlington, Princes Risborough B4009|<small></small>|||||||
|47.0 75.6|75.6 76.2|No access|J7|Thame, Wallingford, A329|<small></small>|||||||
|48.0 48.4|77.3 77.9|No access|J8|Oxford, Cheltenham A40|<small></small>|||||||
|49.0 49.2|78.9 79.2|Thame, Aylesbury A418 Oxford (A40), _Oxford services Welcome Break_|J8a _Services_|Thame, Aylesbury A418 Oxford (A40), _Oxford services Welcome Break_|<small></small>|||||||
|60.3 60.6|97.1 97.6|Bicester, Aylesbury A41 Oxford, Newbury A34, Blenheim Palace|J9|Bicester A41 Oxford, Newbury A34, Blenheim Palace|<small></small>|||||||
|65.9 66.2|106.0 106.6|Northampton A43 (M1) B430, _Cherwell Valley services Moto_, Silverstone|J10 _Services_|Northampton A43 (M1) B430, _Cherwell Valley services_Moto, Silverstone|<small></small>|||||||
|76.2 76.7|122.7 123.4|Banbury A422 Daventry A361, Paulerspury, Towcester|J11|Banbury A422 Chipping Norton A361, Paulerspury, Towcester|<small></small>|||||||
|86.8 87.0|139.7 140.0|Gaydon B4451|J12|Gaydon B4451|<small></small>|||||||
|89.8|144.5|_Warwick Services Welcome Break_|_Services_|_Warwick Services Welcome Break_|<small></small>|||||||
|92.1 92.3|148.2 148.6|No access|J13|Leamington, Warwick, Warwick Castle A452 B4100|<small></small>|||||||
|93.9 94.2|151.1 151.6|Leamington A452|J14|No access|<small></small>|||||||
|95.0 95.3|152.9 153.4|Warwick, Warwick Castle A429 Stratford, William Shakespeare Coventry A46 Leicester (M69)|J15|Warwick A429 Stratford, Coventry A46 Leicester (M69)|<small></small>|||||||
|103.8 104.1|167.1 167.6|Henley-in-Arden A3400|J16|No access|<small></small>|||||||
|105.7 106.0|170.1 170.6|_Start of motorway_ ''Motorway is formed by two sliproads from the M42|J17 (M42, J3a)|_End of motorway _ _Road continues as M42_ The SOUTH WEST, Birmingham (South & West), Redditch & M5 The North, Birmingham (North, East) (M1, M6)|<small></small>|||||||

Data from driver location signs are used to provide distance and carriageway identifier information.  Where a junction goes across several hundred metres, both start and end locations are given.

## Infobox (road)

- **country**: GBR
- **type**: M
- **route**: 40
- **length mi**: 89.0
- **direction a**: Southeast
- **terminus a**: Denham, Buckinghamshire, Denham
- **counties**: Buckinghamshire, Oxfordshire, Northamptonshire, Warwickshire
- **direction b**: Northwest
- **terminus b**: Tanworth in Arden
- **previous type**: M
- **next type**: M
- **previous route**: 32
- **next route**: 42
- **established**: 1967
- **history**: Opened: 1967
Completed: 1991
- **maint**: Highways England
- **map**: M40 motorway (Great Britain) map.svg