Route
Junction number
1
Markerpost
30 km
Name
Denham Roundabout
Type
Non-standard interchange
Terminus
Terminus at end of exit list
Other routes
A40, A412, A4020
Authority
Restricted turns
Full access
Services
No services
M40 J1 Denham Roundabout
Layout and signage
| N/A | A412 A4020 |
|
A40 |
Central London A40 Slough (A412) Uxbridge (A4020) |
Lane configuration
- Lane 1 exits and returns after the junction.
- Lane 2 continues ahead.
- Lane 3 continues ahead.
- Lane 1 continues, with option to exit.
- Lane 2 continues ahead.
- 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...
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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