Route
Junction number
20
Markerpost
118.6 km
Name
Kings Langley Interchange
Terminus
Not a terminus
Other routes
A41, A4251
Authority
Restricted turns
Full access
Services
No services
M25 J20 Kings Langley Interchange
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 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.
London, in a new light
It was specially designed never to be noticed. And now it's disappearing, nobody has noticed its absence. It's London's own bespoke street light.
Have you seen...
M6 Preston Bypass
The "Preston By-Pass" was Britain's first motorway, opened in 1958. These books show the road as it was on opening day and share some of the thrill of this pioneering project.
About this page
Published
Last updated
Published
Last updated
