M25

M25 Junction 20: Kings Langley (A41, A4251)

Map of M25 Junction 20: Kings Langley — M25 Junction 20: Kings Langley. Map data © OpenStreetMap contributors. Map drawing © Corporate Ace Limited.

Junction 20 at Kings Langley links the M25 to the A41 for Hemel Hempstead, Berkhamsted and Aylesbury, and the A4251 for Kings Langley, about a mile north. Abbots Langley and Leavesden are close by. The Paper Mill Museum at Apsley is about three miles north.

Hemel Hempstead and Kings Langley residents, workers at the Leavesden studios and business parks, and families heading out along the A41 use Junction 20.

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

M25 Junction 20 Now: Accidents, Incidents and Roadworks

Live traffic news at M25 Junction 20

Incidents and roadworks between Junction 19 and Junction 21 that we are aware of.

M1 northbound Jct 6 to Jct 8 carriageway closure

PlannedRoadworksClockwise Road closed

Time now: Wednesday, 21 October 2026, 21:47 (9:47pm)

21:28 (9:28pm)21 Oct 2026reported 19 min ago

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 12 minutes · lasts ~7h 00m

This is the news for Junction 20 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 21:47 (9:47pm) Wed 21 Oct 2026

Live Traffic Speeds at M25 Junction 20

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

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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

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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 J20 in Our Records

Incidents here, last 13 days21 collision, 1 breakdown or obstruction

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

Slowest daytime hour clockwise17:00–18:00average 47 mph (typical 56 mph)

Slowest daytime hour anticlockwise07:00–08:00average 44 mph (typical 47 mph)

We recorded two incidents at J20 in the last 13 days: one collision and one breakdown or obstruction. Clockwise, the slowest daytime hour is 17:00, about 9 mph below the typical speed. Anticlockwise, traffic usually keeps close to its typical speed through the day; the slowest hour is 07:00.

Average speed by hour of day at J20

our average, last 11 daysNational Highways’ typical speed

Clockwise

Anticlockwise

Incidents per week at J20

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

The latest 2 here

Thu 15 Oct, 17:47 (5:47pm) Broken Down Vehicle ✓Reported by National Highways
M25 anti-clockwise between junctions J21 and J20
✓ Cleared after about 14 minutes
Mon 12 Oct, 16:10 (4:10pm) Collision ✓Reported by National Highways
M25 anti-clockwise between junctions J20 and J18
✓ Cleared after about 15 minutes

Built from our own records of National Highways’ live data for the M25 either side of J20: speeds from 11 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 J20, Kings Langley
Roads at this junction A41, A4251
Nearest town Kings Langley, 1.1 miles north
Junction before J19, Chandlers Cross, about 1.6 miles in a straight line
Junction after J21, Chiswell, about 2.8 miles in a straight line

Around M25 Junction 20: Kings Langley: Towns and Places on the Map

Map of the area within about 5 miles of M25 Junction 20: Kings Langley, showing the towns, villages, roads and places to visit — The area within about 5 miles of M25 Junction 20. Map data © OpenStreetMap contributors. Map drawing © Corporate Ace Limited.

Places on the Map Near M25 Junction 20
Place	What it is	From the junction
Woodside Stadium	Venue	About 2 miles east
Apsley	Railway station	About 2.5 miles north
Cassiobury Park Station	Attraction	About 2.5 miles south
Watford North	Railway station	About 3 miles south-east
The Paper Trail - The Paper Mill Museum	Attraction	About 3 miles north
Munden House	Historic house or castle	About 4 miles east
Hanstead House	Historic house or castle	About 4 miles east