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M3 westbound traffic at 09:41 on Monday 12 October: 3 live incidents (3 severe/serious) · 1 closure running now · 1 closure tonight.
This page tracks live M3 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 M3 eastbound traffic. The full M3 traffic page covers both directions, with the live map, junction-by-junction status, the latest M3 videos and tonight's M3 roadworks.
Q: Is the M3 westbound closed today?
Yes — the M3 westbound is closed right now: The M3 westbound at junction J12. Other. All lanes are closed. Lanes one, two, three and four are closed. The event is expected to clear between 10:45 and 11:00 on 12 October 2026. Currently Active. Live updates above, direct from National Highways.
Q: Are there any accidents on the M3 westbound today?
3 live incidents on the M3 westbound right now (3 severe or serious) — every one is on the live board above, direct from National Highways.
Q: Why is the M3 slow westbound today?
Right now: The M3 westbound between junctions J9 and J12. Congestion. There are currently delays between 50 and 60 minutes against expected traffic. Currently Active — around 51 minutes of delay. Live detail above.
Q: Are there roadworks on the M3 westbound tonight?
Yes — 2 overnight closures are scheduled on the M3 westbound. Times and junctions are in the closures list above and on the M3 roadworks page.
Q: Where can I check live M3 traffic westbound?
Right here — this page is live M3 traffic for the westbound carriageway, updated every 5 minutes from National Highways, 24 hours a day. The full M3 page covers both directions with the live map and junction-by-junction status.
Q: Which part of the M3 does this page cover?
The whole westbound carriageway, end to end — the M3 runs between London (Sunbury) and Southampton (M27). The eastbound side has its own page.
Daily M3 incidents, posted across all four channels.
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