Route
Junction number
M1 J21
Markerpost
125.4 km
Name
Whetstone Interchange
Terminus
Terminus at top of exit list
Other routes
M1, A5460
Authority
Restricted turns
Full access
Services
No services
M69 (M1 J21) Whetstone Interchange
Layout and signage
Lane configuration
- Lane 1 continues, with option to exit.
- Lane 2 continues, with option to exit.
- Lane 1 continues ahead.
- Lane 2 continues ahead.
Other events
End of motorway regulations
Traffic signals
Start of motorway regulations
What's new
The road that made no sense
It was the UK's only single-carriageway motorway, and twenty years ago it ceased to exist. This is the story of the strange fascination it held, and of my place in history.
The forever bottleneck, part 2
The second part of the story, where we learn why exactly the M4 gets narrower on the final approach to Europe’s biggest city.
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.
Have you seen...
Abbreviations
How do you describe a road? One way is to use these engineering abbreviations, much loved by the UK's community of road enthusiasts.
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