Route
Junction number
1
Markerpost
12.4 km
Name
Chiswick Roundabout
Terminus
Terminus at top of exit list
Other routes
A205, A315, A406
Authority
Restricted turns
Some turns restricted
Services
No services
M4 J1 Chiswick Roundabout
Layout and signage
|
Central London Hammersmith A4 |
A315 A406 |
|
A205 |
N/A |
Lane configuration
- Lane 1 is gained from the entry sliproad.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 1 exits and does not return.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
Other events
End of motorway regulations
40mph speed limit begins
Start of motorway regulations- 40mph 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...
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