M3 crash J4–J4A westbound

Crash on the M3 westbound at J4–J4A on Sunday 27 September 2026, from 11:21. Cleared at 12:42 after 1 h 21 min. Timeline of reports from the motorway signs, TomTom and National Highways.

Status

Cleared 12:42 on 27 Sept 2026, after 1 h 21 min

Location

M3 westbound · J4–J4A

Reported as

Collision

Lanes

Road closed

At its worst

Delay ~10 min

Sources

Motorway signs ×3 · TomTom · National Highways ×6

Timeline

1. Sun 11:21 Motorway signs: “COLLISION [HCA0]”
2. Sun 11:26 Motorway signs: “COLLISION ON SLIP ROAD[HCA0]”
3. Sun 11:30 National Highways: 1 of 4 lanes closed
4. Sun 11:30 National Highways: 1 of 4 lanes closed
5. Sun 11:31 National Highways: road closed
6. Sun 11:46 TomTom: collision, “Stationary traffic, Incident”, delay ~10 min
7. Sun 11:56 TomTom: “Queuing traffic, Incident”
8. Sun 12:00 TomTom: “Slow traffic, Incident”
9. Sun 12:00 Motorway signs no longer show “COLLISION [HCA0]”
10. Sun 12:05 TomTom: now says queueing traffic, “Slow traffic”
11. Sun 12:09 National Highways: 1 of 4 lanes closed
12. Sun 12:09 National Highways: 1 of 4 lanes closed
13. Sun 12:09 National Highways: 2 of 4 lanes closed
14. Sun 12:10 TomTom no longer reports it
15. Sun 12:30 Motorway signs no longer show “COLLISION [HCA0]”
16. Sun 12:30 Motorway signs no longer show “COLLISION ON SLIP ROAD[HCA0]”
17. Sun 12:42 National Highways: lane closure lifted
18. Sun 12:42 All clear: no source reports it any more

Source reports

• Overhead signs read “COLLISION [HCA0]” (4 signs; furthest along: M3 westbound between J4 and J4A).
• Slow traffic
• M3 westbound between J4 and J4A
• Overhead signs read “COLLISION [HCA0]” (1 sign; furthest along: M3 westbound within J4A).
• Overhead signs read “COLLISION ON SLIP ROAD[HCA0]” (1 sign; furthest along: M3 westbound between J4 and J4A).
• M3 eastbound between J4 and J3

Other recent incidents on the M3

• M3 crash J1111:35 · Live
• M3 closed J1–J2 westbound10:16 · cleared after 44 min
• M3 crash J1–J2yesterday 16:43 · cleared after 18 min
• M3 crash J4–J3 eastboundyesterday 07:29 · cleared after 2 h 45 min
• M3 crash J4A–J4 eastboundTue 17:48 · cleared after 2 h 22 min
• M3 crash J3–J2 eastboundTue 17:10 · cleared after 1 h
• M3 crash J2–J3 westboundTue 13:33 · cleared after 1 h 36 min
• M3 crash J3–J2 eastboundTue 06:59 · cleared after 1 h 30 min
• M3 crash J2–J3 eastboundMon 18:13 · cleared after 6 h 53 min
• M3 crash J2–J3 westbound4 Nov 2026 07:52 · cleared after 2 h 40 min

Live traffic and past incidents at M3 J4 and M3 J4A.

The sources don't report causes or injuries, so neither does this page. Times are UK time. For alerts, follow @motorways.me on Bluesky.