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Thorney Interchange

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Thorney Interchange
Location Map ( geo)
M25 Motorway Clockwise. Junction 15 Slip Road For M4 - Geograph - 1280504.jpg
Cameraicon.png View gallery (18)
Location
Colnbrook
County
Buckinghamshire • Middlesex
Highway Authority
National Highways
Junction Type
4-level stack
Roads Joined
M4, M25

Thorney Interchange, also known as Colnbrook Interchange is the junction between the M4 and M25. It is one of three four level stack interchanges in the country. For the M4, it is junction 4B, whilst it is junction 15 for the M25.


History

The M4 Motorway was opened here in March 1965. The M25 was constructed in the 1980s, with the section through the interchange opening to traffic on 18 September 1985. The connecting roads were only partially completed, just allowing M25N to M4W and M4E to M25N. The interchange was fully completed and opened on 19 December 1985.

In order to construct the interchange the main carriageways of the M4 were diverted either side of the central core of the interchange in order to allow construction of the bridge carrying the M4 over the M25 to M4 slip roads, as well as the bridge carrying the M25 over the M4, and the high level bridges carrying M4 to M25 traffic. In addition, the whole interchange also bridges over a railway line.

As part of the interchange construction, the M4 was widened to the east to Junction 4.

Routes

Route To Notes

M4

The WEST, Slough, Reading

M4

London (W & C), Heathrow Airport (Terminals 1, 2 & 3), Central London, Hammersmith

M25

(M40, M1, M11), Oxford, Watford, Stansted Airport

M25

Heathrow Airport (Terminals 4, 5 & Cargo), (M3, M23, M20), Gatwick Airport, Dartford




Thorney Interchange
Related Pictures
View gallery (18)
M25 Anti-clockwise Junction 15 - M4 Junction 4b - Geograph - 1277273.jpg- Coppermine - 3929.jpgJ4b - Coppermine - 6892.jpgM25 M4 interchange - Geograph - 117965.jpgM25 clockwise at junction 15 - Geograph - 355560.jpg
Junctions on the M4
Main RouteChiswick • 2 Brentford • 3 Cranford Parkway • 4 Heathrow • 4B Thorney • 5 Langley • 6 Tuns Lane • 7 Huntercombe • 8/9 Holyport • 10 Winnersh • 11 Three Mile Cross • 12 Theale • 13 Chieveley • 14 Wickham • 15 Plough Hill • 16 Spittleborough • 17 Stanton St Quinton • 18 Tormarton • 19 Hambrook • 20 Almondsbury • 21 Awkley • 22 Pilning • 23 Rogiet • 23A Magor • 24 Coldra • 25 Caerleon • 25A Grove Park • 26 Malpas • 27 High Cross • 28 Tredegar Park • 29 Castleton • 30 Pentwyn • 31 Junction 31 • 32 Coryton • 33 Cardiff West • 34 Miskin • 35 Pencoed • 36 Sarn • 37 Pyle • 38 Margam • 39 Groes • 40 Taibach • 41 Pentyla • 42 Earlswood • 43 Llandarcy • 44 Lon-Las • 45 Ynysforgan • 46 Llangyfelach • 47 Penllergaer • 48 Hendy • 49 Pont Abraham
Heathrow SpurCherry Lane • 4 Heathrow • 4A Concord
Former RoutesBray • 9A Cox Green • 9B The Thicket // 19 Hambrook • 19A Frenchay // 20 Almondsbury • 21 Aust • 22 Newhouse • 23 Magor // 28  Tredegar Park • 29 St Mellons
Defunct Newport
Bypass Proposal
23 Rogiet • 25 Glan Llyn • 27 Dock Way • 29 Castleton
Junctions on the M25 and related routes
M25 & A2821A Littlebrook • 1B Princes Road • 2 Darenth • 3 Swanley • 4 Hewitts Roundabout • 5 Chevening/Chipstead • 6 Godstone • 7 Merstham • 8 Reigate Hill • 9 Leatherhead • 10 Wisley • 11 Addlestone • 12 Thorpe • 13 Runnymede • 14 Poyle/Terminal 5 Roundabout • 15 Thorney • 16 Denham • HS2 Works • 17 Maple Cross • 18 Chorleywood • 19 Chandlers Cross/Hunton Bridge • 20 Kings Langley • 21 Chiswell • 21A Bricket Wood • 22 The Bell • 23 Bignell's Corner • 24 Potters Bar • 25 Waltham Cross • 26 Waltham Abbey • 27 Theydon Bois • 28 Brook Street • 29 Cranham • Ockendon • 30 Mar Dyke • 31 Purfleet
M26Chevening • Otford • 2A Wrotham Heath • 3 Addington
M16 'Ringway 3'Sunbury Cross • Yeading Lane • Oxhey Lane • Bushey • Bignell's Corner • Potters Bar • Waltham Cross • Waltham Abbey • Epping • Theydon Bois • Navestock • Brentwood • Brook Street • Cranham • Mar Dyke • Purfleet • Littlebrook • Princes Road • Darenth • Swanley
'Ringway 4'Addington • Wrotham Heath • Otford • Chevening • Westerham • Godstone • Merstham • Reigate Hill • Leatherhead • Wisley • Addlestone • Thorpe • Runnymede • Poyle • Thorney • Iver Heath • Denham • Maple Cross • Chorleywood • Sarratt • Hunton Bridge • Hoddesdon • Navestock


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