M25

M25 Junction 18: Chorleywood (A404)

Map of M25 Junction 18: Chorleywood — M25 Junction 18: Chorleywood. Map data © OpenStreetMap contributors. Map drawing © Corporate Ace Limited.

Junction 18 is the turn for Chorleywood, Amersham and the Chilterns, on the A404, with Rickmansworth a mile and a half south-east. Loudwater and Chorleywood are right beside it. Croxley station is about two and a half miles east.

Chorleywood and Amersham commuters, and people visiting the Chilterns for the first time, use Junction 18. This page shows the area and what our records say about the junction.

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

M25 Junction 18 Now: Accidents, Incidents and Roadworks

Live traffic news at M25 Junction 18

Incidents and roadworks between Junction 17 and Junction 19 that we are aware of.

M1 northbound Jct 6 to Jct 8 carriageway closure

PlannedRoadworksClockwise Road closed

Time now: Wednesday, 21 October 2026, 21:42 (9:42pm)

21:28 (9:28pm)21 Oct 2026reported 14 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 17 minutes · lasts ~7h 00m

This is the news for Junction 18 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 21:42 (9:42pm) Wed 21 Oct 2026

Live Traffic Speeds at M25 Junction 18

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 J18 in Our Records

Incidents here, last 13 days33 collisions, 0 breakdowns or obstructions

Typical time to clear17 minutesthe middle value of 3 cleared

Slowest daytime hour clockwise17:00–18:00average 42 mph (typical 46 mph)

Slowest daytime hour anticlockwise07:00–08:00average 46 mph (typical 53 mph)

All 3 incidents we recorded at J18 in the last 13 days were collisions. Clockwise, traffic usually keeps close to its typical speed through the day; the slowest hour is 17:00. Anticlockwise, the slowest daytime hour is 07:00, about 7 mph below the typical speed.

Average speed by hour of day at J18

our average, last 11 daysNational Highways’ typical speed

Clockwise

Anticlockwise

Incidents per week at J18

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

The latest 3 here

Wed 21 Oct, 10:02 (10:02am) Collision ✓Reported by National Highways
M25 clockwise between junctions J17 and J18
✓ Cleared after about 24 minutes
Mon 19 Oct, 08:14 (8:14am) Collision ✓Reported by National Highways
M25 clockwise between junctions J17 and J18
✓ Cleared after about 17 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 J18: 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 J18, Chorleywood
Roads at this junction A404
Nearest town Rickmansworth, 1.6 miles south-east
Junction before J17, Maple Cross, about 1.4 miles in a straight line
Junction after J19, Chandlers Cross, about 2.2 miles in a straight line

Around M25 Junction 18: Chorleywood: Towns and Places on the Map

Map of the area within about 5 miles of M25 Junction 18: Chorleywood, showing the towns, villages, roads and places to visit — The area within about 5 miles of M25 Junction 18. Map data © OpenStreetMap contributors. Map drawing © Corporate Ace Limited.

Places on the Map Near M25 Junction 18
Place	What it is	From the junction
The Causeway	Attraction	About 1.5 miles south
Chiltern Open Air Museum	Attraction	About 2.5 miles south-west
Croxley	Railway station	About 2.5 miles east
Moor Park	Historic house or castle	About 3 miles south-east
Cassiobury Park Station	Attraction	About 3 miles east
Watford	Railway station	About 3.5 miles east
Watford North	Railway station	About 4.5 miles east
Woodside Stadium	Venue	About 5 miles north-east