Route
Junction number
1
Markerpost
28.5 km
Name
Swanley Interchange
Terminus
Terminus at top of exit list
Other routes
M25, A20, B2173
Authority
Restricted turns
Full access
Services
No services
M20 J1 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
End of motorway regulations
Start of motorway regulations
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...
Queensway Tunnel
The engineering marvel of its day, much altered and maligned ever since: this is the original Mersey Tunnel in all its glory.
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