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Location from the National Highways junction reference. Nearest towns: Uxbridge, Iver, Hillingdon, Gerrards Cross.
Wider area: counting every road within 3 miles — local streets, A-roads, everything — 1,279 collisions are on record, 16 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 M40 itself, within 2 miles of J1A. 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 M40 J1A → 4 of 15 junctions on the M40 · see where it ranks nationallyM40 J1A is at Denham & Gerrards Cross. National Highways signs it as M25 Interchange. The nearest town is Uxbridge.
Live incidents for the whole M40 are listed on the M40 traffic page, updated every 5 minutes from National Highways.
Police STATS19 records show 32 collisions on the M40 within 2 miles of J1A, including 1 fatal and 7 serious. Counting every road in the area, 1,279 collisions are recorded within 3 miles. That ranks it 252 of 554 UK junctions we hold collision records for.
Live incidents, roadworks and delays for the whole M40, updated every 5 minutes from National Highways.
🚗 M40 live traffic →