Chiswell Interchange

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Chiswell Interchange
Location Map
M25 junction 21 - Geograph - 14308.jpg
The four-levels, viewed from the M25
Cameraicon.png View gallery (24)
Location
Bricket Wood
County
Hertfordshire
Highway Authority
Highways England
Junction Type
Modified Directional-T/Modified 4-level Stack
Roads Joined
M1, M25

Chiswell Interchange is a major junction between the M1 and M25 motorways near St Albans in Hertfordshire, and was opened in October 1986 as part of the last section of the M25. For the M1, it is junction 6a, whilst it is junction 21 for the M25. The junction is a modified directional-T style interchange, with the modification being that instead of terminating, the M1 continues through the junction. No links from or to the southern M1 are provided.

In other words it is a four-level stack with the south-facing slip roads omitted.

It has the additional complication that its eastern slip roads are interlaced with the western slips of M25 J21A.

Routes

Route To Notes

M1

The NORTH, Luton Airport

M1

London, Watford access/exit from/to M25 via nearby A405

M25

Stansted Airport (M11), Dartford Tnl (M20), Stevenage (A1(M)) as signed on M25

M25

(M11, M20), Stansted Airport, Dartford as signed down sliproad from M1

M25

Heathrow Airport M4, Aylesbury A41 as signed on M25

M25

(M40, M4, M3) Heathrow Airport as signed down sliproad from M1

(A405)

St Albans, London (N.W.), (M1 South) west facing M25 slips of junction 21a braided into the junction


Strip Maps

Links

CBRD



Chiswell Interchange
Related Pictures
View gallery (24)
M1 J6a sliproad.jpgM1 looking south at J6a - Coppermine - 15211.jpgM25 J21 exit.jpgThe M25 near Junction 21 - Geograph - 1253860.jpgWelcome to the M25! - Geograph - 2101798.jpg
Junctions on the M1
Marble Arch • Hampstead • 1 Staples Corner • 2 Fiveways • Scratchwood • 4 Brockley • Bushey • 5 Berrygrove • 6 Waterdale • 6A Chiswell • 7 Beechtrees • 8 Breakspears • 9 Friars Wash • 10 Pepperstock; (10A Kidney Wood) • 11 Junction 11 • 11A Chalton • 12 Toddington • 13 Ridgemont • 14 Broughton • 15 Collingtree • 15A Rothersthorpe • 16 Kislingbury • 17 Kilsby • 18 Crick • 19 Catthorpe • 20 Misterton • 21 Whetstone • 21A Kirby Muxloe • 22 Markfield • 23 Shepshed • Long Whatton • 23A Finger Farm • 24 Kegworth • 24A Warren Lane • 25 Sandiacre • M42 • 26 Nuthall • 27 Junction 27 • 28 Pinxton • 29 Heath • 29A Duckmanton • 30 Barlborough • 31 Aston • 32 Thurcroft • 33 Catcliffe • 34 Tinsley • 35 Thorpe Hesley • 35A Tankersley • 36 Birdwell • 37 Dodworth • 38 Haigh • 39 Durkar • 40 Flushdyke • Kirkhamgate • 41 Carrgate • 42 Lofthouse • 43 Belle Isle • 44 Rothwell Haigh • 45 East Leeds Link • 46 Austhorpe • 47 Parlington • 48 Hook Moor
Former Leeds city section: 43 Stourton • 44 Belle Isle • 45 Tunstall • 46 Hunslet • 47 Holbeck
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