M4 J4B Thorney Interchange

Layout and signage

Watford (M1 Link)
Oxford (M40 Link)
(M3 Link)
Gatwick Airport
Heathrow Airport T4, 5 & Cargo
M25 Link
  M25
(M1)
(M40)
    M25
(M3)
(M23)
  (M3 Link)
Gatwick Airport
Heathrow Airport T4, 5 & Cargo
Watford (M1 Link)
Oxford (M40 Link)
M25 Link

Lane configuration

LanesLanesLanesLanesLanesLanesLanes

  • Lane 1 exits and returns after the junction.
  • Lane 2 exits and returns after the junction.
  • Lane 3 continues ahead.
  • Lane 4 continues ahead.
  • Lane 5 continues ahead.

LanesLanesLanesLanesLanesLanesLanes

  • Lane 1 exits and does not return.
  • Lane 2 exits and returns after the junction.
  • Lane 3 continues ahead.
  • Lane 4 continues ahead.
  • Lane 5 continues ahead.

Other events

  • Signs Variable Speed Limits apply
  • Signs Variable Speed Limits apply

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