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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

 

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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)
Lanes Anticlockwise Lanes Clockwise
LanesLanesLanesLanesLanes LanesLanesLanesLanesLanes
  • Lane 1 exits and does not return.
  • Lane 2 continues ahead.
  • Lane 3 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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