Map of M25 Junctions 16 to 23: Rickmansworth, Watford and St Albans
North of the M40 the M25 runs through the Hertfordshire and Buckinghamshire countryside, past Rickmansworth and Chorleywood, round the west of Watford, across the M1 at junction 21 and on past St Albans to South Mimms, where the A1(M) heads north.
Commuters from the Chilterns, visitors to Watford and St Albans, and drivers joining the M1 or the A1(M) all use this quarter. South Mimms services sits at junction 23.
The road on the map is coloured by the live traffic flow speed, the same data as our live M25 traffic flow map. Choose clockwise or anticlockwise above the map. Tap any junction number to open that junction’s own page.
Map data © OpenStreetMap contributors. Map drawing © Corporate Ace Limited.
Driving Junction 16 to Junction 23: Distances and Times
From junction 16 to junction 23 is about 22 miles along the M25, about 19 minutes at the 70 mph speed limit in clear traffic. Here it is junction by junction; tap a junction to open its own page.
- J16 to J17: about 5½ miles, about 5 minutes
- J17 to J18: about 1½ miles, about 1 minute
- J18 to J19: about 2½ miles, about 2 minutes
- J19 to J20: about 1½ miles, about 1 minute
- J20 to J21: about 3 miles, about 3 minutes
- J21 to J21A: about half a mile, under a minute
- J21A to J22: about 4½ miles, about 4 minutes
- J22 to J23: about 3 miles, about 3 minutes
Distances are measured along the motorway between the centres of the junctions, from OpenStreetMap, and rounded to the nearest half mile. Times are at a steady 70 mph and do not allow for joining, leaving, roadworks or lower speed limits, so check the live map above and the live M25 speed flow map before you set off.
M25 Junctions 16 to 23 Now: Accidents, Incidents and Roadworks
M25 serious incident · Road closed
The information we are receiving suggests the M25 anti-clockwise between J16 and J15 is closed (other). It appears to have started at 22:00 (10pm). National Highways expects it to clear by Thu 22 Oct, 05:30 (5:30am).
Live traffic news at M25 Junctions 16 to 23
Incidents and roadworks between Junction 16 and Junction 23 that we are aware of.
M25 Anti-clockwise Jct 15 carriageway closure between exit and entry slip road
22:52 (10:52pm)21 Oct 2026reported 10 min ago
- Location
- M25 anti-clockwise between J16 and J15
- Direction
- Anticlockwise
- Lanes closed
- Carriageway closed
- Reason
- Other
- Schedule
- 22:00 (10pm) Wed 21 Oct 2026 → 05:30 (5:30am) Thu 22 Oct 2026
M25 Anti-clockwise Jct 16 to Jct 15 lane 4,3,2 closure
22:52 (10:52pm)21 Oct 2026reported 10 min ago
- Location
- M25 anti-clockwise between J16 and J15
- Direction
- Anticlockwise
- Lanes closed
- Lane closures
- Reason
- Other
- Schedule
- 22:00 (10pm) Wed 21 Oct 2026 → 05:30 (5:30am) Thu 22 Oct 2026
M1 northbound Jct 6 to Jct 8 carriageway closure
22:52 (10:52pm)21 Oct 2026reported 10 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
This is the news for Junctions 16 to 23 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 23:02 (11:02pm) Wed 21 Oct 2026
The Junctions in Section 4
- J16DenhamNearest town: Gerrards Cross, 2.1 miles north-west
- J17Maple CrossNearest town: Rickmansworth, 1.6 miles east
- J18ChorleywoodNearest town: Rickmansworth, 1.6 miles south-east
- J19Chandlers CrossNearest town: Kings Langley, 2.5 miles north
- J20Kings LangleyNearest town: Kings Langley, 1.1 miles north
- J21ChiswellNearest town: Kings Langley, 2.9 miles west
- J21ABricket WoodNearest town: St Albans, 3.0 miles north-east
- J22The BellNearest town: St Albans, 3.7 miles north-west
- J23Bignells CornerNearest town: Potters Bar, 1.9 miles east
