Route
Junction number
1
Markerpost
23 km
Name
South Mimms Interchange
Terminus
Not a terminus
Other routes
M25, A1081
Authority
Restricted turns
Full access
Services
Service area here
Service area name
South Mimms
Services operator
Welcome Break
A1(M) J1 South Mimms Interchange
Layout and signage
(M11 
South Mimms
Lane configuration
- Lane 1 exits and does not return.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 1 is gained from the entry sliproad.
- Lane 2 continues, with option to exit.
- Lane 3 continues ahead.
Other events
Start of motorway regulations
End of motorway regulations
What's new
Grand openings
Our much-loved Opening Booklets section has two new publications for you to explore, and we’re making some overdue changes to make them easier to find and easier to read.
Silver bullet
The Silvertown Tunnel is finally open for business. One question remains: what’s it for?
Skid Risk, Accident, Fog
For the first time, we can share pictures of the pioneering experiment that lit up the Worcestershire countryside with enormous signs 61 years ago.
Have you seen...
To the Limit
Speed limits are more emotive and divisive than almost anything else about the road network. How do you sort the fact from the opinion? And how did we end up with the speed limits we have?
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