Route
Junction number
None
Markerpost
Unknown
Name
Pencraig Speed Limit Change
Type
Speed limit change
Terminus
Not a terminus
Other routes
None
Authority
Restricted turns
Full access
Services
No services
A40 Pencraig Speed Limit Change
Layout and signage
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.
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...
Glasgow
Even in the 1960s heyday of roadbuilding, some people said you could never build your way out of congestion. Glasgow had plans to prove them wrong.
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Published
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