Route
Junction number
3
Markerpost
14.0 km
Name
Swanley Interchange
Terminus
Not a terminus
Other routes
M20, A20, B2173
Authority
Restricted turns
Full access
Services
No services
M25 J3 Swanley Interchange
Layout and signage
Lane configuration
- Lane 1 continues, with option to exit.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 1 continues, with option to exit.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
Other events
Variable Speed Limits apply
National Speed Limit begins
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.
Have you seen...
Rainbow Signals
The annual London Pride event was accompanied, in 2016, by some quite unusual changes to traffic lights around Trafalgar Square. The green men went missing — and seven new symbols took their place.
About this page
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