Route
Junction number
M4 J8/9
Markerpost
45.2 km
Name
Holyport Interchange
Terminus
Terminus at end of exit list
Other routes
M4, A408(M)
Authority
Restricted turns
Full access
Services
No services
A308(M) (M4 J8/9) Holyport Interchange
Traffic signalsWhat'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...
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