Route
Junction number
21
Markerpost
155 km
Name
Whetstone Interchange
Terminus
Not a terminus
Other routes
M69, A5460
Authority
Restricted turns
Full access
Services
No services
M1 J21 Whetstone Interchange
Layout and signage
Lane configuration
- Lane 1 is gained from the entry sliproad.
- Lane 2 continues, with option to exit.
- Lane 3 continues ahead.
- Lane 4 continues ahead.
- Lane 1 exits and does not return.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 4 continues ahead.
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...
M1 under construction
Pictures taken as the first section of the M1 was being built in 1958-9, with all its unique architecture still under construction.
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