Route
Junction number
46
Markerpost
307.4 km
Name
Llangyfelach Interchange
Type
Non-standard interchange
Terminus
Not a terminus
Other routes
A48, B4489
Authority
Restricted turns
Full access
Services
No services
M4 J46 Llangyfelach Interchange
Layout and signage
|
Llangyfelach Felindre B4489 |
|
A48 B4489 A48 |
Llangyfelach Felindre B4489 |
Lane configuration
- Lane 1 continues, with option to exit.
- Lane 2 continues ahead.
- Lane 1 continues, with option to exit.
- Lane 2 continues ahead.
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...
M1 Architecture
The most unique motorway in Britain owes its identity to its fifties architecture. Much of it is in danger of being removed or irreperably altered. This page documents it in detail.
About this page
Published
Last updated
Published
Last updated
