Route
Junction number
(M4 J43)
Markerpost
0.0 km
Name
Llandarcy Interchange
Terminus
Terminus at end of exit list
Other routes
M4, B4290
Authority
Restricted turns
Full access
Services
No services
A465 Llandarcy Interchange
National Speed Limit begins
40mph speed limit beginsWhat'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...
Old Motorway Photos
A gallery of images sent in by visitors to the site of original photos of motorways — including some impressive views of the M4 and M11 under construction.
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