M25 Junction 16: Denham (M40)
Junction 16 at Denham is where the M40 leaves for High Wycombe, Oxford and Birmingham. Tatling End, Fulmer and Higher Denham are close by, and Gerrards Cross is about two miles north-west. Denham Country Park is about two miles east, and the Battle of Britain Bunker at RAF Uxbridge about three miles south-east.
Drivers heading for High Wycombe, Oxford or Birmingham leave here for the M40, along with Gerrards Cross and Denham residents. If that is your route, start with this page.
The M40 has its own sister site, M40 Traffic ↗ (opens in a new tab), with live news and roadworks for the whole road.
Check this junction now: live M25 speed flow map · latest M25 traffic news · M25 serious incidents · M25 accidents
M25 Junction 16 Now: Accidents, Incidents and Roadworks
Live traffic news at M25 Junction 16
Incidents and roadworks between Junction 15 and Junction 17 that we are aware of.
M1 northbound Jct 6 to Jct 8 carriageway closure
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
+ 3 more near Junction 16 - see all the M25 traffic news →
This is the news for Junction 16 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 16
The speed strip below shows the M25 around this junction, both directions, from National Highways’ live data, checked every five minutes.
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.
Go to our live M25 traffic speed flow map ›
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 J16 in Our Records
Most incidents we recorded at J16 were breakdowns or obstructions; 2 of 6 were collisions. Clockwise, traffic usually keeps close to its typical speed through the day; the slowest hour is 17:00. Anticlockwise, the daytime traffic here slows most between 08:00 and 09:00, averaging 32 mph against a typical 48 mph.
Average speed by hour of day at J16
Clockwise
Anticlockwise
Incidents per week at J16
The latest 5 here
- Mon 19 Oct, 19:35 (7:35pm) Collision ✓Reported by National Highways
M25 anti-clockwise between junctions J16 and J15
✓ Cleared after about 14 minutes - Mon 19 Oct, 14:24 (2:24pm) Broken Down Vehicle ✓Reported by National Highways
M25 clockwise between junctions J16 and J17
✓ Cleared after about 73 minutes (1.22 hours) - Fri 16 Oct, 07:44 (7:44am) Collision ✓Reported by National Highways
M25 clockwise between junctions J16 and J17
✓ Cleared after about 27 minutes - Tue 13 Oct, 13:45 (1:45pm) Broken Down Vehicle ✓Reported by National Highways
M25 clockwise at junction J16
✓ Cleared after about 34 minutes - Mon 12 Oct, 08:02 (8:02am) Other ✓Reported by National Highways
M25 clockwise between junctions J16 and J17
✓ Cleared after about 25 minutes
Built from our own records of National Highways’ live data for the M25 either side of J16: 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 J16, Denham
- Roads at this junction M40
- Nearest town Gerrards Cross, 2.1 miles north-west
- Junction before J15, Thorney, about 4.8 miles in a straight line
- Junction after J17, Maple Cross, about 5.4 miles in a straight line
Around M25 Junction 16: Denham: Towns and Places on the Map
| Place | What it is | From the junction |
|---|---|---|
| Denham Country Park | Park or nature reserve | About 2 miles east |
| Coppins | Historic house or castle | About 2.5 miles south |
| Wexham Park Hospital | Hospital | About 2.5 miles south-west |
| Battle of Britain Bunker - RAF Uxbridge | Attraction | About 3 miles south-east |
| Breakspear House | Historic house or castle | About 3.5 miles north-east |
| The Ickenham Miniature Railway | Attraction | About 4 miles east |
| The Cage Pollard | Attraction | About 4.5 miles west |
| Manor Farm Complex | Attraction | About 4.5 miles east |
