The A12: where people are seriously hurt
Over 2021–2025, 377 people were killed or seriously injured in 331 collisions on the A12, making it the 24th worst numbered road in Britain by that measure.
331
serious or fatal collisions
377
people killed or seriously injured
28
collisions that took a life
#24
of 150 numbered roads
What the record shows
The A12 carries 1,604 recorded injury collisions over the period, 331 of them serious or fatal. Serious injury concentrates in East Suffolk, Redbridge, Colchester, with 3 further areas also recording collisions. Its fatal share, 8%, sits close to the 7% average for the numbered network. Most collisions were recorded on 70 mph sections. The worst year of the period was 2025 with 90 serious collisions, and the count is up 36% between 2021 and 2025.
Every serious and fatal collision on the A12
Blue markers are serious collisions, red crosses fatal. Click any marker for the year. Zoom in to see the specific junctions and stretches where they cluster.
Where along the route
- East Suffolk74 KSI
- Redbridge57 KSI
- Colchester39 KSI
- Chelmsford34 KSI
- Braintree31 KSI
- Tower Hamlets23 KSI
Local authority areas with the most serious collisions on this road.
The trend
Serious and fatal collisions on the A12
2025: 90 (up 57.9% on the year before) · peak 90 in 2025 · +36.4% across the period
Axis clipped to the data range to show year-on-year movement.
About the A12
How many accidents happen on the A12?
Police recorded 1,604 injury collisions on the A12 over 2021–2025, of which 331 were fatal or serious. Those serious collisions left 377 people killed or seriously injured, including 28 fatal collisions.
Is the A12 a dangerous road?
By volume of serious injury it ranks 24 of the 150 numbered roads we analyse, and 21 among a roads. That is a count rather than a rate: longer and busier roads accumulate more collisions, so a high ranking reflects exposure as well as risk.
Where on the A12 do collisions happen?
They concentrate in East Suffolk, Redbridge, Colchester. The map on this page plots every serious and fatal collision recorded on the route, so you can see the specific stretches rather than the total.
Counts include every collision the police recorded on this road number across all authority areas. They are not adjusted for traffic volume or road length, so treat them as a measure of where injury concentrates rather than a per-mile risk rating. Method. Free to reuse with attribution to this page.
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