Route
Junction number
2
Markerpost
34 km
Name
Thorpe Interchange
Type
Terminus
Not a terminus
Other routes
M25
Authority
Restricted turns
Full access
Services
No services
M3 J2 Thorpe Interchange
Layout and signage
(M23 
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 does not return.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Then further along:
- Lane 1 is gained from the entry sliproad.
- Lane 2 is gained from the entry sliproad.
- Lane 3 is gained from the entry sliproad.
- Lane 4 continues ahead.
- Lane 5 terminates.
Other events
National Speed Limit begins
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...
Smart Motorways
Motorways used to be really simple. Now they have electronic signals, variable speed limits, emergency lay-bys, part-time hard shoulders... Just what is so smart about Smart Motorways?
About this page
Published
Last updated
Published
Last updated
