Route
Junction number
None
Markerpost
27.5 km
Name
Abercanaid Roundabout
Type
Roundabout
Terminus
Not a terminus
Other routes
A4060
Authority
Restricted turns
Full access
Services
No services
A470 Abercanaid Roundabout
What's new
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.
Hello, here's my ridiculous side project
An introduction to what I write, and why I write it, and where my strange new road sign simulator fits in to all this.
Have you seen...
The Magic Roundabout
Officially the seventh most frightening thing on the road network - but actually it might just be the most efficient junction ever designed.
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Last updated
Published
Last updated
