M25

M25 Junction 21A: Bricket Wood (A405)

Map of M25 Junction 21A: Bricket Wood — M25 Junction 21A: Bricket Wood. Map data © OpenStreetMap contributors. Map drawing © Corporate Ace Limited.

Junction 21A at Bricket Wood links the M25 to the A405 for St Albans, about three miles north-east, and Watford. Bricket Wood, How Wood and Chiswell Green are beside it. St Albans Abbey station is about two and a half miles north-east, and The Hypocaust, the Roman bath house in Verulamium Park, about the same distance north.

St Albans and Bricket Wood residents, visitors to the abbey and the Roman remains, and drivers delivering around Watford join the M25 here.

Check this junction now: live M25 speed flow map · latest M25 traffic news · M25 serious incidents · M25 accidents

M25 Junction 21A Now: Accidents, Incidents and Roadworks

Live traffic news at M25 Junction 21A

Incidents and roadworks between Junction 20 and Junction 22 that we are aware of.

M1 northbound Jct 6 to Jct 8 carriageway closure

PlannedRoadworksClockwise Road closed

Time now: Wednesday, 21 October 2026, 21:52 (9:52pm)

21:50 (9:50pm)21 Oct 2026reported just now

Location: link road from M25 J21 clockwise to M1 J6A northbound
Direction: Clockwise
Lanes closed: Carriageway closed
Reason: Roadworks
Schedule: 22:00 (10pm) Wed 21 Oct 2026 → 05:00 (5am) Thu 22 Oct 2026

Forecast - not confirmed

🚧HA scheduled: 22:00 (10pm) Wed 21 Oct 2026 → 05:00 (5am) Thu 22 Oct 2026 starts in about 7 minutes · lasts ~7h 00m

This is the news for Junction 21A only, not the whole M25. For the rest of the motorway see all the latest M25 traffic news, the overhead signs and the speed limits in force now.

Updated 21:52 (9:52pm) Wed 21 Oct 2026

Live Traffic Speeds at M25 Junction 21A

The speed strip below shows the M25 around this junction, both directions, from National Highways’ live data, checked every five minutes.

Show junctions

From to

Colour the road by

Show on the map

Untick all three to see just the speeds. We show the important overhead signs and the mandatory speed limits (red ring); see every overhead sign.

Key

60 mph +50–5930–4915–29under 15

closedM62connecting motorwayA6A road👈M1our site: tap for its map

services, on the side you can reach them

crashincidentqueueroadworksspeed limitspeed shown on the signsstop-startoverhead sign

reported by drivers, which can’t always be relied onconfirmed by National Highways

Tap a stretch of road to see its speed.

Go to our live M25 traffic speed flow map ›

In an emergency call 999. To report a problem on a motorway, call National Highways on 0300 123 5000 (24 hours).

NOTE: The speed flow, overhead sign messages or other information shown on our live traffic speed flow map is updated every few minutes. We cross check the data and aim to provide warnings if there could be a delay or an inaccurate speed reading. There can be occasions, beyond our control, and despite our best efforts where the speed flow could be inaccurate. We cannot therefore guarantee the speed you can expect on any stretch of the motorway is always accurately shown. However we hope you will find our live traffic speed flow map a useful tool in trying to plan your journey. Safe driving.

All the latest M25 traffic news →Live M25 traffic speed flow map →

M25 J21A in Our Records

Incidents here, last 13 days10 collisions, 1 breakdown or obstruction

Typical time to clear–too few cleared incidents to say yet

Slowest daytime hour clockwise16:00–17:00average 52 mph (typical 58 mph)

Slowest daytime hour anticlockwise18:00–19:00average 41 mph (typical 58 mph)

The one incident we recorded at J21A in the last 13 days was a breakdown or obstruction. Clockwise, the slowest daytime hour is 16:00, about 6 mph below the typical speed. Anticlockwise, the daytime traffic here slows most between 18:00 and 19:00, averaging 41 mph against a typical 58 mph.

Average speed by hour of day at J21A

our average, last 10 daysNational Highways’ typical speed

Clockwise

Anticlockwise

Incidents per week at J21A

collisionsbreakdowns and obstructions* part week: we started recording during it

The latest 1 here

Sun 18 Oct, 09:16 (9:16am) Broken Down Vehicle ✓Reported by National Highways
M25 clockwise at junction J21A
✓ Cleared after about 227 minutes (3.78 hours)

Built from our own records of National Highways’ live data for the M25 either side of J21A: speeds from 10 days of five-minute readings, incidents from the last 13 days (we started recording incidents on 09/10/2026). Each incident is counted once. Updated every five minutes.

Junction M25 J21A, Bricket Wood
Roads at this junction A405
Nearest town St Albans, 3.0 miles north-east
Junction before J21, Chiswell, about 0.5 miles in a straight line
Junction after J22, The Bell, about 4.1 miles in a straight line

Around M25 Junction 21A: Bricket Wood: Towns and Places on the Map

Map of the area within about 5 miles of M25 Junction 21A: Bricket Wood, showing the towns, villages, roads and places to visit — The area within about 5 miles of M25 Junction 21A. Map data © OpenStreetMap contributors. Map drawing © Corporate Ace Limited.

Places on the Map Near M25 Junction 21A
Place	What it is	From the junction
Hanstead House	Historic house or castle	About 1.5 miles south-east
Woodside Stadium	Venue	About 1.5 miles south-west
Munden House	Historic house or castle	About 2 miles south
Garston	Railway station	About 2 miles south
St Albans Abbey	Railway station	About 2.5 miles north-east
The Hypocaust	Attraction	About 2.5 miles north
Millennium Maze	Attraction	About 3.5 miles north-east
Colney Fields Shopping Park	Shopping	About 4 miles east