M25 Junction 12: Thorpe (M3)
Junction 12 at Thorpe is where the M3 leaves for Basingstoke and Southampton. Thorpe, Thorpe Green and Lyne are beside it, and Chertsey is about a mile and a half east. Chertsey station is about a mile and a half south-east, and Staines station about two and a half miles north-east.
Theme-park visitors, drivers heading down the M3 towards Southampton, and people living around Thorpe and Chertsey use this junction. The map shows what is around it.
Thorpe Park, about a mile east, opened in 1979 and is home to Hyperia, the UK's tallest and fastest roller coaster. Tickets and opening days are on the Thorpe Park website ↗ (opens in a new tab).
For the M3 towards Basingstoke and Southampton, see our sister site M3 Traffic ↗ (opens in a new tab).
Check this junction now: live M25 speed flow map · latest M25 traffic news · M25 serious incidents · M25 accidents
M25 Junction 12 Now: Accidents, Incidents and Roadworks
Live traffic news at M25 Junction 12
Incidents and roadworks between Junction 11 and Junction 13 that we are aware of.
M1 northbound Jct 6 to Jct 8 carriageway closure
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
This is the news for Junction 12 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 12
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 J12 in Our Records
Most incidents we recorded at J12 were breakdowns or obstructions; 2 of 7 were collisions. Clockwise, the slowest daytime hour is 16:00, about 5 mph below the typical speed. Anticlockwise, the slowest daytime hour is 15:00, about 15 mph below the typical speed.
Average speed by hour of day at J12
Clockwise
Anticlockwise
Incidents per week at J12
The latest 5 here
- Mon 19 Oct, 17:35 (5:35pm) Broken Down Vehicle ✓Reported by National Highways
M25 anti-clockwise between junctions J12 and J11
✓ Cleared after about 7 minutes - Sat 17 Oct, 13:56 (1:56pm) Broken Down Vehicle ✓Reported by National Highways
M25 clockwise at junction J12
✓ Cleared after about 20 minutes - Sat 17 Oct, 12:32 (12:32pm) Collision ✓Reported by National Highways
M25 clockwise at junction J12
✓ Cleared after about 75 minutes (1.25 hours) - Fri 16 Oct, 19:21 (7:21pm) Broken Down Vehicle ✓Reported by National Highways
M25 clockwise entry slip at junction J12
✓ Cleared after about 17 minutes - Fri 16 Oct, 07:49 (7:49am) Collision ✓Reported by National Highways
M25 anti-clockwise between junctions J12 and J11
✓ Cleared after about 20 minutes
Built from our own records of National Highways’ live data for the M25 either side of J12: 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 J12, Thorpe
- Roads at this junction M3
- Nearest town Chertsey, 1.5 miles east
- Junction before J11, Chertsey, about 2.1 miles in a straight line
- Junction after J13, Runnymede, about 3.0 miles in a straight line
Around M25 Junction 12: Thorpe: Towns and Places on the Map
| Place | What it is | From the junction |
|---|---|---|
| Thorpe Park | Attraction | About 1 mile east |
| Chertsey | Railway station | About 1.5 miles south-east |
| St Peter's Hospital | Hospital | About 1.5 miles south |
| Staines | Railway station | About 2.5 miles north-east |
| Longcross | Railway station | About 2.5 miles south-west |
| Ashford Hospital | Hospital | About 4 miles north-east |
