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M4 J23 at 13:53 on Tuesday 6 October: closure planned from 21:00 tomorrow.
Straight from National Highways, re-checked every 3 minutes while this page is open.
Location from the National Highways junction reference.
Wider area: counting every road within 3 miles — local streets, A-roads, everything — 77 collisions are on record, 5 of them fatal. That figure follows how built-up the area is, so it is shown for context and is not what the ranking uses.
Department for Transport STATS19 police collision records on the M4 itself, within 2 miles of J23. This is the free summary — the full breakdown by severity, weather, road surface, time of day and individual record is in the blackspot report.
📊 Full collision analysis for M4 J23 → 35 of 49 junctions on the M4 · see where it ranks nationallyM4 J23 is at Magor & Undy. National Highways signs it as Magor.
No — as of 13:53 National Highways list nothing at M4 J23. This page re-checks their live feed every few minutes, 24 hours a day.
Not right now. Planned: M4 eastbound Jct 23 to 22 Prince of Wales Bridge carriageway closure, from 21:00 tomorrow until 06:00 Thu 8 Oct.
Police STATS19 records show 19 collisions on the M4 within 2 miles of J23, including 0 fatal and 7 serious. Counting every road in the area, 77 collisions are recorded within 3 miles. That ranks it 411 of 554 UK junctions we hold collision records for.
Live incidents, roadworks and delays for the whole M4, updated every 5 minutes from National Highways.
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