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Swanley Interchange

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Swanley Interchange
Location Map ( geo)
The A20 Dual Carriageway becomes the M20 Motorway.jpg
Start of the M20
Cameraicon.png View gallery (9)
Location
Swanley
County
Kent
Highway Authority
Highways England
Junction Type
Roundabout with Free-flow links
Roads Joined
M25, A20, M20, B2173
Junctions related to the B2173

Swanley Interchange is junction 1 of the M20 and junction 3 of the M25.

It was built in 1976/77 concurrently with the M20 to West Kingsdown and the M25 to Dartford to replace a 1966 trumpet junction built for the A20 Swanley Bypass that previously stood on the site. The original 1977 construction provided a high-level bridge over the M20 in readiness for extension of the M25/Ringway 3 westwards but without any embankments or bridges over the roundabout so was completely isolated from the network. It was built for 2 lanes plus hard shoulders either way (the M20 is the same configuration at the lowest level) so when the M25 came it was configured with 3 lanes and no hard shoulders to fit the width. The high-level bridge wasn't used until February 1986 when the M25 to Sevenoaks opened. In the early 1980s direct slip roads from M20 (London-bound) to M25 (anti-clockwise) and vice-versa were added.

Strip Maps

Routes

Route To Notes

M20

Dover, Channel Tunnel, Maidstone

M25

(M11, M1), Dartford Crossing, Stansted Airport, C.London (A2)

M25

(M23, M3, M4), Gatwick Airport, Heathrow Airport, Bromley (A21)

A20

London (SE), Lewisham

A20

West Kingsdown, Farningham (A225)

B2173

Swanley

Grid References

TQ526676




Swanley Interchange
Related Pictures
View gallery (9)
Swanley Interchange 1984.PNGSwarco Motus AluStar traffic lights, Swanley Kent - Coppermine - 16848.jpgSwarco Motus AluStar traffic lights, Swanley Kent - Coppermine - 16846.jpgSwarco Motus AluStar traffic lights, Swanley Kent - Coppermine - 16847.jpgSwarco Motus AluStar traffic lights, Swanley Kent - Coppermine - 16843.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 M20
Swanley • West Kingsdown • 2 Wrotham Hill • 3 Addington • 4 Leybourne • 5 Aylesford • 6 Sandling • 7 Junction 7 • 8 Hollingbourne • 9 Junction 9 • 10 Lacton • 10A Sevington • 11 Stanford • 11A Beachborough • 12 Cheriton • 13 Castle Hill
Junctions on the A20
New Cross • Loampit Vale • Lee Green • Cliftons Roundabout • Frognal Corner • Crittalls Corner • Birchwood Corner • Swanley • Wrotham Hill • Wrotham Heath • Aylesford • Bridges Gyratory • Hollingbourne • Drovers Roundabout • Lacton • Stanford • Beachborough Cross Roads • Cheriton • Castle Hill • Alkham Valley • Western Heights Roundabout • Limekiln Roundabout • Prince of Wales • York Street • Eastern Docks Roundabout


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