M25 Junction 21A Traffic

🚨 Live at M25 J21A right now

Checked 12:15 · auto-refresh

✅Nothing reported at M25 J21A right now.

Straight from National Highways, re-checked every 3 minutes while this page is open.

All live M25 traffic →M25 clockwise →M25 anticlockwise →M25 roadworks →

Is M25 junction 21A closed? Quick answers

Checked 12:15 on Thursday 12 November 2026.

Is M25 junction 21A closed right now?

No. Nothing is closing the road at M25 junction 21A at 12:15.

Is M25 junction 21A closed tonight?

No. No closures are planned at M25 junction 21A tonight (Thu 12 Nov, 18:00 to 06:00).

Tonight: every M25 closure ›

Is M25 junction 21A closed this weekend?

Yes. M25 junction 21A has 1 full closure planned this weekend (Fri 13 Nov 18:00 to Mon 16 Nov 06:00): Clockwise Jct 21 to Jct 21A Carriageway and Slip Road Closure, Sun 22:30 to 05:30. Diversion: Diversion Via National Highways Network.

This weekend: every M25 closure ›

Is there an accident at M25 junction 21A today?

No. No collision has been reported at M25 junction 21A since midnight.

M25 accidents today and yesterday ›

Answers use official data only: the National Highways live incident feed and their planned closure report. A closure is counted here when National Highways name this junction or a stretch that runs through it.

🗺️ Where M25 J21A is

Location from the National Highways junction reference. Nearest towns: Radlett, Watford, St Albans, Hemel Hempstead.

📍 Heading to… from M25 J21A

Also near this junction

Warner Bros. Studio Tour London Attraction · Leavesden, Hertfordshire 1.5 miles south-west in a straight line 🧭 Directions Hertfordshire traffic

St Albans Cathedral Heritage · St Albans, Hertfordshire 3.5 miles north-east in a straight line 🧭 Directions Hertfordshire traffic

Vicarage Road Stadium · Watford, Hertfordshire 4 miles south in a straight line 🧭 Directions Hertfordshire traffic

Hatfield House Heritage · Hatfield, Hertfordshire 8.5 miles north-east in a straight line 🧭 Directions Hertfordshire traffic

Wembley Stadium Stadium · Wembley, Greater London 11 miles south-east in a straight line 🧭 Directions Greater London traffic

London Luton Airport Airport · Luton, Bedfordshire 12 miles north in a straight line 🧭 Directions Bedfordshire traffic

Places and the junctions they are reached from are kept by our team; distances are measured in a straight line from the junction, not along the road.

⚠️ Collision record on the M25 at J21A

164Collisions

0Fatal

24Serious

251Casualties

Worse than most

Ranked 134 of 556 UK junctions on record · 22 of 33 on the M25

Wider area: counting every road within 3 miles — local streets, A-roads, everything — 2,334 collisions are on record, 28 of them fatal. That figure follows how built-up the area is, so it is shown for context and is not what the ranking uses.

Department for Transport STATS19 police collision records on the M25 itself, within 2 miles of J21A. This is the free summary — the full breakdown by severity, weather, road surface, time of day and individual record is in the blackspot report.

📊 Full collision analysis for M25 J21A → 22 of 33 junctions on the M25 · see where it ranks nationally

❓ M25 J21A — Frequently Asked Questions

Where is M25 junction 21A?

M25 J21A is at St Albans & Bricket Wood. National Highways signs it as M1 North. The nearest town is Radlett.

Is there an accident at M25 J21A?

No — as of 12:15 National Highways list nothing at M25 J21A. This page re-checks their live feed every few minutes, 24 hours a day.

Is M25 junction 21A closed?

No closure is listed at M25 J21A as of 12:15.

How many accidents happen at M25 junction 21A?

Police STATS19 records show 164 collisions on the M25 within 2 miles of J21A, including 0 fatal and 24 serious. Counting every road in the area, 2,334 collisions are recorded within 3 miles. That ranks it 134 of 556 UK junctions we hold collision records for.

What is near M25 junction 21A?

Within 15 miles of M25 J21A: Warner Bros. Studio Tour London (attraction, Leavesden), about 1.5 miles south-west in a straight line; St Albans Cathedral (heritage, St Albans), about 3.5 miles north-east in a straight line; Vicarage Road (stadium, Watford), about 4 miles south in a straight line; Hatfield House (heritage, Hatfield), about 8.5 miles north-east in a straight line; Wembley Stadium (stadium, Wembley), about 11 miles south-east in a straight line; London Luton Airport (airport, Luton), about 12 miles north in a straight line.

🚨 Live M25 traffic

Live incidents, roadworks and delays for the whole M25, updated every 5 minutes from National Highways.

🚗 M25 live traffic →

↔️ Next junctions

← J21
St Albans & Bricket Wood J22
London Colney & St Albans →

📍 Towns near this junction

Radlett 3.3 mi Watford 3.4 mi St Albans 4.1 mi Hemel Hempstead 4.3 mi

🔢 All M25 junctions

J1A J1B J2 J3 J4 J5 J6 J7 J8 J9 J10 J11 J12 J13 J14 J15 J16 J17 J18 J19 J20 J21 J21A J22 J23 J24 J25 J26 J27 J28 J29 J30 J31

🆘 Broken down near M25 J21A?

Car recovery near this junction - local firms you can call direct:

On a motorway? If you can, get onto the hard shoulder or into an emergency area, leave by the left-hand doors and wait behind the barrier. Stuck in a live lane: stay in the car with your seatbelt on and hazard lights on, and call 999.

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