Swanley Interchange
Swanley Interchange | |||
Location Map ( geo) | |||
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Start of the M20 | |||
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Location | |||
Swanley | |||
County | |||
Kent | |||
Highway Authority | |||
National Highways | |||
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 |
Dover, Channel Tunnel, Maidstone | ||
(M11, M1), Dartford Crossing, Stansted Airport, C.London (A2) | ||
(M23, M3, M4), Gatwick Airport, Heathrow Airport, Bromley (A21) | ||
London (SE), Lewisham | ||
West Kingsdown, Farningham (A225) | ||
Swanley |
Grid References