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Location from the National Highways junction reference. Nearest towns: Hatfield, Welwyn Garden City, South Mimms, Welwyn.
Wider area: counting every road within 3 miles — local streets, A-roads, everything — 728 collisions are on record, 13 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 A1(M) itself, within 2 miles of J4. 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 A1(M) J4 → 4 of 19 junctions on the A1(M) · see where it ranks nationallyA1(M) J4 is at Hatfield & Welwyn Garden City. National Highways signs it as Hatfield North. The nearest town is Hatfield.
Live incidents for the whole A1(M) are listed on the A1(M) traffic page, updated every 5 minutes from National Highways.
Police STATS19 records show 47 collisions on the A1(M) within 2 miles of J4, including 1 fatal and 13 serious. Counting every road in the area, 728 collisions are recorded within 3 miles. That ranks it 141 of 554 UK junctions we hold collision records for.
Live incidents, roadworks and delays for the whole A1(M), updated every 5 minutes from National Highways.
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