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M4 westbound traffic at 08:50 on Monday 12 October: road closed northbound until 06:00 Sat 5 Dec · 2 live incidents (1 severe/serious).
This page tracks live M4 traffic westbound only — every incident, closure and roadworks National Highways publish for the westbound carriageway, updated every 5 minutes, 24 hours a day. Anything they list without naming a direction is shown here too, so nothing is missed.
Heading the other way? See M4 eastbound traffic. The full M4 traffic page covers both directions, with the live map, junction-by-junction status, the latest M4 videos and tonight's M4 roadworks.
Q: Is the M4 westbound closed today?
Yes — the M4 westbound is closed right now: The M4 westbound at junction J19. Vehicle Fire. All lanes are closed. The hard shoulder, lanes one, two and three are closed. The event is expected to clear between 09:00 and 09:15 on 12 October 2026. Currently Active. Live updates above, direct from National Highways.
Q: Are there any accidents on the M4 westbound today?
2 live incidents on the M4 westbound right now (1 severe or serious) — every one is on the live board above, direct from National Highways.
Q: Why is the M4 slow westbound today?
Right now: The M4 westbound between junctions J18 and J19. Congestion. Currently Active — around 3 minutes of delay. Live detail above.
Q: Are there roadworks on the M4 westbound tonight?
Yes — 1 overnight closure is scheduled on the M4 westbound. Times and junctions are in the closures list above and on the M4 roadworks page.
Q: Where can I check live M4 traffic westbound?
Right here — this page is live M4 traffic for the westbound carriageway, updated every 5 minutes from National Highways, 24 hours a day. The full M4 page covers both directions with the live map and junction-by-junction status.
Q: Which part of the M4 does this page cover?
The whole westbound carriageway, end to end — the M4 runs between London (Chiswick) and Pont Abraham (Wales). The eastbound side has its own page.
Daily M4 incidents, posted across all four channels.
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