Route
Junction number
38
Markerpost
285.4 km
Name
Margam Interchange
Terminus
Not a terminus
Other routes
A48
Authority
Restricted turns
Some turns restricted
Services
No services
M4 J38 Margam Interchange
Layout and signage
|
Port Talbot A48 |
A48 | 
|
Port Talbot A48 |
Lane configuration
- Lane 1 is gained from the entry sliproad.
- Lane 2 continues, with option to exit.
- Lane 3 continues ahead.
- Lane 1 exits and does not return.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
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...
Preston Bypass
The very first motorway was eight miles of relief for the Lancashire town of Preston. It goes without saying that there's an interesting story to be told about it.
About this page
Published
Last updated
Published
Last updated
