M40 J1 Denham Roundabout

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Route

M40

Junction number

Markerpost

Name

Denham Roundabout

Type

Non-standard interchange

Terminus

Terminus at end of exit list

Other routes

A40, A4020

Authority

Highways England

Restricted turns

Full access

Services

No services

Layout and signage

N/A

A412

A4020

A40

Central London
A40

Slough
(A412)
Uxbridge
(A4020)

Lane configuration

Lanes Lanes Lanes Lanes Lanes

Lane 1 exits and returns after the junction.
Lane 2 continues ahead.
Lane 3 continues ahead.

Lanes Lanes Lanes Lanes Lanes

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

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British Roads FAQ

The most Frequently Asked Questions where British Roads are concerned, and the answers. A good place to start if you're new to the subject or you're looking for quick facts.