M25 J3 Swanley Interchange

Layout and signage

London
A20
Maidstone
Channel Tunnel
M20 Link
Swanley
B2173
 


A20


B2173
   

M20

A20
  Maidstone
Channel Tunnel
Dover
M20 Link
London (SE)
Swanley
A20

Lane configuration

LanesLanesLanesLanesLanes

  • Lane 1 continues, with option to exit.
  • Lane 2 continues ahead.
  • Lane 3 continues ahead.

LanesLanesLanesLanesLanes

  • Lane 1 continues, with option to exit.
  • Lane 2 continues ahead.
  • Lane 3 continues ahead.

Other events

  • Signs Variable Speed Limits apply
  • Signs National Speed Limit begins

In this section

What's new

The road that made no sense

It was the UK's only single-carriageway motorway, and twenty years ago it ceased to exist. This is the story of the strange fascination it held, and of my place in history.

The forever bottleneck, part 2

The second part of the story, where we learn why exactly the M4 gets narrower on the final approach to Europe’s biggest city.

The forever bottleneck, part 1

The M4 into London was one of the UK's earliest and most ambitious motorway projects. It was bold, pioneering... and almost instantly regretted.

Share this page

Have you seen...

Mancunian Way

Manchester's highway in the sky, carrying traffic around the city centre and rapidly becoming an iconic part of the city's heritage.

About this page

Published

Last updated