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
Where did the M25 come from?
London’s notorious orbital motorway turns 40 years old today. Where did it come from - and why the number “25”?
The long way round
When a road is closed, why isn't the diversion route just the quickest way past the closure?
Signs and sensibility
The one great attempt to make London’s streets logical - and how one retired chauffeur’s favourite routes changed the way you get around the capital.
Have you seen...
Emergency Diversion Routes
Those funny black and yellow symbols are everywhere - and they might just get you back on track one day.
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