Route
Junction number
7
Markerpost
46.0 km
Name
Merstham Interchange
Type
Terminus
Not a terminus
Other routes
M23
Authority
Restricted turns
Full access
Services
No services
M25 J7 Merstham Interchange
Layout and signage
Lane configuration
- Lane 1 exits and returns after the junction.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 4 continues ahead.
- Lane 1 exits and returns after the junction.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 4 continues ahead.
Other events
Variable Speed Limits apply
- Variable Speed Limits apply
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...
Almondsbury Interchange
The UK's first four-level interchange opened in 1966. Relive some of the wonder and excitement of this icon of the motorway era with the book published to mark its completion.
About this page
Published
Last updated
Published
Last updated
