See this location on SABRE Maps

Route
#
Junction number
21A
Markerpost
123.8
Name
Unknown
Terminus
Not a terminus
Other routes
None
Authority
Highways England
Restricted turns
Full access
Services
No services

Layout and signage

Watford
Harrow
A405
London (NW)
(M1 S Link)
  A405



    A405



  St Albans
A405
London (NW)
(M1 S Link)

Lane configuration

LanesLanesLanesLanesLanesLanes

  • Lane 1 exits and does not return.
  • Lane 2 continues ahead.
  • Lane 3 continues ahead.
  • Lane 4 continues ahead.

LanesLanesLanesLanesLanesLanes

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

Other events

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