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M3 Blackspot analysis

Severe Blackspot · 801 combined incidents · 10 fatal · Showing full road data

674Police Collisions
10Fatal
139Serious
1,046Casualties
127NH Incidents
801Combined
UKTU Danger Score
88
out of 100
Far worse than most

Ranked 89 of 737 UK roads with 100+ recorded collisions by recorded harm.

A ranking of our own records, not a risk-per-vehicle measure and not an official safety assessment. Collisions are weighted by outcome: one fatal counts for 50 slight collisions, one serious for 8.

📍 Each pin marks an actual police-recorded collision location · Zoom in and click for details

What the full record shows for M3

Two things we can tell you now. The rest is in the detailed record.

Still to come
  • The hour of day collisions cluster in — and whether it is rush hour or late night
  • Weather and road surface recorded by police at the scene, ranked
  • Year-on-year trend — whether this junction is getting worse or safer
  • Speed limit where each collision happened
  • Every individual record, with vehicles and casualties

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M3 · 24 hours
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Credits open individual police records: slight-injury crash 1, serious 2, fatal 3. Records you open stay open.
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The M3 road safety report – every collision, severity split, conditions and junction ranking, to print or file – comes with the Road Pass.

See the road safety report →

Data Sources: DfT STATS19 police-recorded collision data and National Highways incident data, both under Open Government Licence v3.0. This is historical DfT statistical data — not an official police report. Blackspot classification is algorithmic and not an official safety assessment. © 2026 UK Traffic Updates.

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⚡ Early Warning System
We detected congestion building on the M3 3 minutes before this incident was officially reported.
In the last 30 days, we've detected 281 incidents on the M3 an average of 1107 minutes early.
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