8/8A
46.5 km
Birchanger Green Interchange
Not a terminus
A120, B1256
Full access
Service area here
Birchanger Green
Welcome Break
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 second part of the story, where we learn why exactly the M4 gets narrower on the final approach to Europe’s biggest city.
The M4 into London was one of the UK's earliest and most ambitious motorway projects. It was bold, pioneering... and almost instantly regretted.
Desperately-needed but never built, this was one of the only London urban motorway plans that were ever progressed to the construction stage.
Published
Last updated
Birchanger Green
