Route
Junction number
24
Markerpost
217.9 km
Name
Coldra Interchange
Terminus
Not a terminus
Other routes
A48, A449, B4237
Authority
Restricted turns
Full access
Services
No services
M4 J24 Coldra Interchange
Layout and signage
Lane configuration
- Lane 1 exits and returns after the junction.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 1 exits and returns after the junction.
- Lane 2 continues ahead.
- Lane 3 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.
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...
Driver Location Signs
If you're on the motorway (in England at least) you might have noticed some funny blue signs down the side of the road. What are they for?
About this page
Published
Last updated
Published
Last updated
