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M4 J30 at 08:50 on Monday 12 October: nothing reported at this junction — live National Highways updates every few minutes.
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 — 963 collisions are on record, 9 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 J30. 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 J30 → 43 of 49 junctions on the M4 · see where it ranks nationallyM4 J30 is at Cardiff & Pentwyn. National Highways signs it as Cardiff Bay.
No — as of 08:50 National Highways list nothing at M4 J30. This page re-checks their live feed every few minutes, 24 hours a day.
No closure is listed at M4 J30 as of 08:50.
Police STATS19 records show 10 collisions on the M4 within 2 miles of J30, including 0 fatal and 3 serious. Counting every road in the area, 963 collisions are recorded within 3 miles. That ranks it 505 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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