Junctions
Data from driver location signs are used to provide distance and carriageway identifier information. Where a junction spans several hundred metres, both start and end locations are given.
| M40 motorway | |||
| km | Southbound exits (B carriageway) | Junction | Northbound exits (A carriageway) |
|---|---|---|---|
| 29.2 | End of motorway Road continues as A40 to London |
J1 |
Start of motorway Road formed from main carriageways of A40 from London |
| Slough A412 Uxbridge A4020 Non motorway traffic |
|||
| 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 |
| 39.9 40.7 |
Beaconsfield, Amersham, Slough A355, Beaconsfield services | J2 Services |
Beaconsfield, Amersham, Slough A355, Beaconsfield services |
| 44.7 45.2 |
No access | J3 | Loudwater and High Wycombe (East) A40 |
| 50.3 50.9 |
High Wycombe, Marlow, Maidenhead A404 (M4)+ | J4 | High Wycombe, Marlow A404 (M4) |
| 62.6 63.2 |
High Wycombe (West), Stokenchurch A40 | J5 | Stokenchurch A40 |
| 66.7 67.2 |
Watlington, Princes Risborough B4009 | J6 | Thame, Watlington, Princes Risborough B4009 |
| 75.6 76.2 |
No access | J7 | Thame, Wallingford, A329 |
| 77.3 77.9 |
No access | J8 | Oxford, Cheltenham A40 |
| 78.9 79.2 |
Thame, Aylesbury A418 Oxford (A40), Oxford services |
J8a Services |
Thame, Aylesbury A418 Oxford (A40), Oxford services |
| 97.1 97.6 |
Bicester, Aylesbury A41 Oxford, Newbury A34 |
J9 | Bicester A41 Oxford, Newbury A34 |
| 106.0 106.6 |
Northampton A43 (M1) B430, Cherwell Valley services |
J10 Services |
Northampton A43 (M1) B430, Cherwell Valley services |
| 122.7 123.4 |
Banbury A422 Daventry A361 |
J11 | Banbury A422 Chipping Norton A361 |
| 139.7 140.0 |
Gaydon B4451 | J12 | Gaydon B4451 |
| 144.5 | Warwick Services | Services | Warwick Services |
| 148.2 148.6 |
No access | J13 | Leamington, Warwick A452 B4100 |
| 151.1 151.6 |
Leamington A452 | J14 | No access |
| 152.9 153.4 |
Warwick A429 Stratford, Coventry A46 Leicester (M69) |
J15 | Warwick A429 Stratford, Coventry A46 Leicester (M69) |
| 167.1 167.6 |
Henley A3400 | J16 | No access |
| 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 |
Read more about this topic: M40 Motorway