M4 Accidents & Incidents
This page brings together the latest M4 accidents and incidents — collisions, breakdowns, spillages and other unplanned events that can cause sudden delays or closures on the M4 motorway.
Latest M4 accidents and incidents
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Good news - no hold-ups reported on the M4 right now!
Looks like a clear run - have a safe and smooth journey.
Conditions can change, and not every hold-up is reported instantly, so do check back before you travel. Our traffic news updates automatically throughout the day.
Updated 08:02 Wed 16 Sept 2026
Powered by National Highways’ Transport Data Feeds.
Staying safe on the M4
Accidents can appear with little warning and conditions can change fast. If you come across an incident, keep your distance and follow any signs or lane closures. In an emergency always call 999, and never use a phone while driving — stop somewhere safe first. For live updates across the whole motorway see our Latest M4 Traffic News page.
M4 crashes and accidents — what the numbers say
A crash on the M4 stops a great many people quickly, and today’s M4 accident news is above. The Department for Transport’s own M4 counts explain why an M4 incident clears slowly.
156,491
M4 vehicles a day
on the busiest stretch. Anything that closes one M4 lane is stopping a share of that immediately — and at the Heathrow end there is very little room either side.
1 in 5
is a van at Bristol
24,926 light goods vehicles a day at the M4/M5 interchange, plus 11,167 lorries. An M4 crash out west is rarely just cars, which is why lanes stay shut longer.
2×
the lorries by Bristol
M4 HGV traffic more than doubles between London and the Severn. A heavy goods vehicle involved in an M4 accident closes more lanes and takes far longer to recover.
32%
the M4 rush-hour swing
The M4 does have a quieter middle of the day — so an M4 crash at 7am and the same crash at 11am produce very different delays.
⚠ We report the latest M4 accident and crash news exactly as National Highways issue it and no more. The feed does not see everything that happens on the M4 motorway, so when we say there is nothing to report, that is precisely what we mean — not that the M4 is clear.
Figures are Average Annual Daily Flow for 2025, from Department for Transport road traffic statistics published on 20 May 2026.