2. Motorway Database
  3. M40
  4. M40 J1A Denham Interchange

M40 J1A Denham Interchange

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Route
M40
#
Junction number
1A
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 Link 		  M25
(M4)
(M25)		     M25
(M1)
(M11)		   Watford (M1 Link)
Rickmansworth
Heathrow Airport
Slough (M4 Link)
(M11 Link, M23 Link)
M25 Link

Lane configuration

LanesLanesLanesLanesLanesLanes

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

LanesLanesLanesLanesLanesLanes

  • Lane 1 exits and does not return.
  • Lane 2 exits and does not return.
  • Lane 3 splits to create a new lane.
  • Lane 4 continues ahead.