Route
Junction number
None
Markerpost
Unknown
Name
Aberbaiden Roundabout
Terminus
Not a terminus
Other routes
A4077, B4246
Authority
Restricted turns
Full access
Services
No services
A465 Aberbaiden Roundabout
Layout and signage
|
Gilwern Crughywel — Crickhowell A4077 Blaenafon — Bleanavon B4246 |
A4077 | 
|
B4246 |
Gilwern Crughywel — Crickhowell A4077 Blaenafon — Bleanavon B4246 |
Lane configuration
- Lane 1 continues, with option to exit.
- Lane 2 continues ahead.
- Lane 1 continues, with option to exit.
- Lane 2 continues ahead.
Other events
National Speed Limit begins
50mph 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.
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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...
Junction Three
The M621 has one junction where everything leaves the motorway and heads for the city, and a very bizarre junction it is too.
About this page
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Published
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