Route
Junction number
27
Markerpost
159.8 km
Name
Theydon Interchange
Type
Terminus
Not a terminus
Other routes
M11
Authority
Restricted turns
Full access
Services
No services
M25 J27 Theydon 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...
The Magic Roundabout
Officially the seventh most frightening thing on the road network - but actually it might just be the most efficient junction ever designed.
About this page
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Last updated
Published
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