M40 J1A Denham Interchange

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Route

M40

Junction number

Markerpost

32.5

Name

Denham Interchange

Type

Partially Unrolled Cloverleaf

Terminus

Not a terminus

Other routes

M25

Authority

Highways England

Restricted turns

Full access

Services

No services

Layout and signage

Watford (M1 Link)
Rickmansworth
Heathrow Airport

Slough (M4 Link)
(M11 Link, M23 Link)
M25

M25
(M4)
(M25)

M25
(M1)
(M11)

Watford (M1 Link)
Rickmansworth
Heathrow Airport

Slough (M4 Link)
(M11 Link, M23 Link)
M25

Lane configuration

Lanes Lanes Lanes Lanes Lanes Lanes

Lane 1 is gained from the entry sliproad.
Lane 2 continues, with option to exit.
Lane 3 continues ahead.
Lane 4 continues ahead.

Lanes Lanes Lanes Lanes Lanes Lanes

Lane 1 exits and does not return.
Lane 2 continues ahead.
Lane 3 continues ahead.
Lane 4 continues ahead.

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