M40 J1 Denham Roundabout

Route

M40

Junction number

1

Markerpost

30

Name

Denham Roundabout

Type

Non-standard interchange

Terminus

Terminus at end of exit list

Other routes

A40, A412, A4020

Authority

National Highways

Restricted turns

Full access

Services

No services

Layout and signage

N/A   A412



A4020


    A40






  Central London
A40
Slough
(A412)
Uxbridge
(A4020)

Lane configuration

LanesLanesLanesLanesLanes

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

LanesLanesLanesLanesLanes

  • Lane 1 continues, with option to exit.
  • Lane 2 continues ahead.
  • Lane 3 continues ahead.

Other events

  • Signs Start of motorway regulations
  • Signs End of motorway regulations

In this section

What's new

Imperfectly Odd: Batheaston Bypass

It has viaducts, a tunnel and plenty of controversy, but the amazing Batheaston Bypass doesn’t really work. What went wrong?

South London's lost motorways

Completing the story of London's epic Ringways, we've just published the Southern Radials, five more motorways that never saw the light of day.

To the north east!

Two new additions to our collection of Opening Booklets take us to Darlington and Middlesbrough.

Share this page

Have you seen...

Gateshead Highway

The unloved and unfinished Gateshead Highway is due to be demolished. Take a look at the road that Gateshead can't wait to get rid of.

About this page

Published22 April 2017

Last updated9 May 2022