Route
Junction number
M25 J20
Markerpost
Unknown
Name
Kings Langley Interchange
Terminus
Terminus at end of exit list
Other routes
M25, A4251
Authority
Restricted turns
Full access
Services
No services
A41 (M25 J20) Kings Langley Interchange
Layout and signage
Lane configuration
- Lane 1 continues ahead.
- Lane 2 continues ahead.
- Lane 1 continues, with option to exit.
- Lane 2 continues, with option to exit.
Other events
Traffic signals
What's new
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.
Hello, here's my ridiculous side project
An introduction to what I write, and why I write it, and where my strange new road sign simulator fits in to all this.
Have you seen...
Low Emission Zone
A first step towards emissions-based road pricing, a pointless measure to enforce something that's happening anyway, or another leap forward in traffic planning from the people who created the Congestion Charge? It's hard to say.
About this page
Published
Last updated
Published
Last updated
