Route
Junction number
25A
Markerpost
222.8 km
Name
Grove Park Interchange
Type
Terminus
Not a terminus
Other routes
A4042
Authority
Restricted turns
Some turns restricted
Services
No services
M4 J25A Grove Park Interchange
Layout and signage
 Usk
|
A4042 |
|
Casnewydd — Newport Cwmbran A4042 Usk
|
Lane configuration
- Lane 1 is gained from the entry sliproad.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 1 exits and does not return.
- Lane 2 continues ahead.
- Lane 3 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...
A1(M) Darlington Bypass
Opened in May 1965, the A1(M) Darlington Bypass was one of the UK's earliest motorways and made huge strides in linking the North East to the rest of England. Explore the pioneering spirit of its engineers in the book they produced to mark its opening.
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