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M25 J23 at 10:47 on Monday 12 October: 1 nearby · closure planned from 22:00.
Straight from National Highways, re-checked every 3 minutes while this page is open.
Location from the National Highways junction reference. Nearest towns: South Mimms, Potters Bar, Borehamwood, Barnet.
Wider area: counting every road within 3 miles — local streets, A-roads, everything — 882 collisions are on record, 12 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 M25 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 M25 J23 → 18 of 33 junctions on the M25 · see where it ranks nationallyM25 J23 is at South Mimms & Potters Bar. National Highways signs it as South Mimms. The nearest town is South Mimms.
Not at M25 J23 itself as of 10:47. Nearby, National Highways report: The M25 anti-clockwise between junctions J22 and J21A. Utility Works - Electric. There will be three of four lanes closed. Lanes two, three and four will be closed. From 23:00 on 16 October 2026 to 0… (Anticlockwise) (1 junction away).
Not right now. Planned: M25 Anti-clockwise Jct 25 to Jct 23 carriageway closure, from 22:00 until 05:30 Tue 13 Oct.
Police STATS19 records show 108 collisions on the M25 within 2 miles of J23, including 1 fatal and 6 serious. Counting every road in the area, 882 collisions are recorded within 3 miles. That ranks it 123 of 554 UK junctions we hold collision records for.
Live incidents, roadworks and delays for the whole M25, updated every 5 minutes from National Highways.
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