M25 Junction 21A

Where is Junction 21A?

Junction 21A is on the M25's northern stretch, just after Junction 21, the M1 interchange: the two are only 0.6 miles apart. It's where the A405, the North Orbital Road, gives access to Watford and St Albans.

Coming off here

There's a petrol station only 0.6 miles from the junction: come off towards Watford and Bricket Wood, and it's off the first exit from the A405.

Where to stop

The better stop around here is probably Junction 22 at London Colney, which has fuel and a McDonald's on the roundabout immediately off the motorway, and a wider choice at the London Colney retail park nearby.