M40 J1A Denham Interchange

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 continues ahead.
  • Lane 3 continues ahead.
  • Lane 4 continues ahead.