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Denham Interchange

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Denham Interchange
Location Map ( geo)
M40 Motorway - Signs for junction 1a - Geograph - 1792765.jpg
Cameraicon.png View gallery (14)
Location
Gossams Wood
County
Buckinghamshire
Highway Authority
Highways England
Junction Type
Partially Unrolled Cloverleaf
Roads Joined
M25, M40

Denham Interchange is junction 16 of the M25 and junction 1A of the M40. It is very similar in layout to Winnersh and Croft Interchanges, with variations in size and orientation, except that at Croft one left-turn slip road is on the inside.

The creation of this junction meant the moving of the west-facing slips of Denham Roundabout.

History

The earliest known plans for the junction date from 1964 when it was planned to be much closer to Denham Roundabout. The junction would serve not only the M25 and M40 but also Ringway 3. A lack of success at trying to find plans for the junction means the layout is as yet unknown other than reports and correspondence that describe it as spaghetti.

Layout of the four level stack showing the intended braiding between the two junctions

In 1966 Buckinghamshire County Council made their own plans for the upgrade of the North Orbital Road (M25) which was adopted by the Ministry. The junction would have been a four level stack located in the same place as the 1964 proposal. The close proximity to Denham Roundabout meant the slip roads between the junctions would have been braided. The west facing slips at Denham Roundabout were built to accommodate the four level stack. The four level stack proposal lasted until the Ringways were scrapped in 1973.

Following the cancellation of the Ringways there was no longer a need for the connection to Ringway 3 so alternative alignments for the M25 further west were investigated. The four level stack was rejected as being too big and intrusive so alternative layouts were sought. The M25 and junction eventually opened in 1985 approximately 1km west of the original proposals. Ironically the extra distance between the junctions resulted in the westbound entry slip at Denham Roundabout being shortened to increase the weaving length which the originally intended braiding would have solved.

Routes

Route To Notes

M25

(M1, M11), Watford, Stansted Airport, Rickmansworth, Harlow

M25

(M4, M3, M23), Heathrow Airport, Gatwick Airport

M40

Birmingham, Oxford, Beaconsfield

M40

Uxbridge, London




Denham Interchange
Related Pictures
View gallery (14)
M25 M40 gantry.jpgM40 Motorway - Signs for junction 1a - Geograph - 1792765.jpgM25 junction16 - Geograph - 2391574.jpgM40 Motorway at junction 1 - Geograph - 2358008.jpgJoining The M40 Motorway From The M25 Junction 16 Clockwise - Geograph - 1280505.jpg
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 Colnbrook • 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 • Colnbrook • Iver Heath • Denham • Maple Cross • Chorleywood • Sarratt • Hunton Bridge • Hoddesdon • Navestock
Junctions on the M40
Denham Roundabout • 1A Denham Interchange • 2 Beaconsfield • 3 Knave's Beech • 3A Junction 3A • 4 Handy Cross • 5 Stokenchurch • 6 Lewknor  • 7 Three Pigeons • 8 & 8A Wheatley • 9 Wendlebury  • 10 Ardley • 11 Junction 11 • 12 Junction 12 • 13 Junction 13 • 14 Barford • 15 Longbridge • 16 Junction 16 •  M42 (3A) Umberslade
Proposed extension to M5: M42 3 Portway Island • M42 2 Hopwood Park • M42 1 Harvester Island • M5 4A Catshill • M5 4 Lydiate Ash


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