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Route M25 and A282 Name Add this »
Junction number 21A Type Roundabout Interchange
Markerpost 123.8 Terminal Does not terminate M25 and A282
Other routes here Managed by Highways Agency
Restricted No Services None

 

Signage Anticlockwise Junction layout Signage Clockwise
Watford
Harrow
A405
London (NW)
(M1 S Link)
A405



Junction diagram A405



St Albans
A405
London (NW)
(M1 S Link)
Events Anticlockwise Events Clockwise
  • Sign Variable speed limits apply
  • Sign Variable speed limits apply
Lanes Anticlockwise Lanes Clockwise
LanesLanesLanesLanesLanesLanes LanesLanesLanesLanesLanesLanes
  • Lane 1 exits and does not return.
  • Lane 2 continues ahead.
  • Lane 3 continues ahead.
  • Lane 4 continues ahead.
  • Lane 4 continues ahead.
  • Lane 3 continues ahead.
  • Lane 2 continues, with option to exit.
  • Lane 1 is gained from the entry sliproad.

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