M4 4B Thorney Interchange

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Route
#
Junction number
4B
Markerpost
27.5
Name
Thorney Interchange
Terminus
Not a terminus
Other routes
M25
Authority
Highways England
Restricted turns
Full access
Services
No services

Layout and signage

Watford (M1 Link)
Birmingham (M40 Link)
Heathrow Airport T4 & Cargo
Gatwick Airport (M23 Link)
Winchester (M3 Link)
M25 Link
  M25
(M1)
(M40)
    M25
(M3)
(M23)
  Heathrow Airport T4 & Cargo
Gatwick Airport (M23 Link)
Watford (M1 Link)
Birmingham (M40 Link)
M25 Link

Lane configuration

LanesLanesLanesLanesLanesLanes

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

LanesLanesLanesLanesLanesLanes

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