Route
Junction number
8
Markerpost
30.8 km
Name
Merstham Interchange
Type
Terminus
Not a terminus
Other routes
M25
Authority
Restricted turns
Full access
Services
No services
M23 J8 Merstham Interchange
Layout and signage
(M4 
Lane configuration
- Lane 1 exits and does not return.
- Lane 2 exits and returns after the junction.
- Lane 3 continues ahead.
- Lane 4 continues ahead.
- Lane 1 exits and returns after the junction.
- Lane 2 exits and returns after the junction.
- Lane 3 continues ahead.
- Lane 4 continues ahead.
Other events
National Speed Limit begins
Variable Speed Limits apply
What's new
Grand openings
Our much-loved Opening Booklets section has two new publications for you to explore, and we’re making some overdue changes to make them easier to find and easier to read.
Silver bullet
The Silvertown Tunnel is finally open for business. One question remains: what’s it for?
Skid Risk, Accident, Fog
For the first time, we can share pictures of the pioneering experiment that lit up the Worcestershire countryside with enormous signs 61 years ago.
Have you seen...
Old Motorway Photos
A gallery of images sent in by visitors to the site of original photos of motorways — including some impressive views of the M4 and M11 under construction.
About this page
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