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
The sunlit uplands
On Saturday 31 May something historic happened. The Heads of the Valleys Road was finally complete.
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?
Have you seen...
Major incidents
What happens when there's a big accident on a trunk route? Who picks up the pieces, and why does it take so long?
About this page
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