Route
Junction number
20
Markerpost
118.6
Name
Kings Langley Interchange
Terminus
Not a terminus
Other routes
A41, A4251
Authority
Highways England
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
Go west! New Ringways pages are here
A new set of Ringways pages are now online, looking at unbuilt motorways and road projects west of London.
No smoke without ire
London's Ultra Low Emission Zone has just expanded to cover the whole inner city, and across the UK, other cities are implementing their own Clean Air Zones. Is this the future?
Devon help us
Road signs are colour coded for different types of road, but in Devon there are more colours than anywhere else. What do Devon's colourful signs mean?
Have you seen...
Road Numbers
We'd be lost without them. Find your way around road numbering - how it works, how it was done and how it doesn't always work all that well.