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Route M40 Name Denham Interchange
Junction number 1A Type Partially Unrolled Cloverleaf
Markerpost 32.5 Terminal Does not terminate M40
Other routes here M25 Managed by Highways Agency
Restricted No Services None

 

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Signage Northbound Junction layout Signage Southbound
Watford (M1 Link)
Rickmansworth
Heathrow Airport
Slough (M4 Link)
(M11 Link, M23 Link)
M25 Link		 M25
(M4)
(M25)		 Junction diagram M25
(M1)
(M11)		 Watford (M1 Link)
Rickmansworth
Heathrow Airport
Slough (M4 Link)
(M11 Link, M23 Link)
M25 Link
Lanes Northbound Lanes Southbound
LanesLanesLanesLanesLanesLanes LanesLanesLanesLanesLanesLanes
  • Lane 1 is gained from the entry sliproad.
  • Lane 2 continues, with option to exit.
  • Lane 3 continues ahead.
  • Lane 4 continues ahead.
  • Lane 4 continues ahead.
  • Lane 3 continues ahead.
  • Lane 2 continues ahead.
  • Lane 1 exits and does not return.

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