The A33: where people are seriously hurt
Over 2021–2025, 96 people were killed or seriously injured in 91 collisions on the A33, making it the 140th worst numbered road in Britain by that measure.
91
serious or fatal collisions
96
people killed or seriously injured
9
collisions that took a life
#140
of 150 numbered roads
What the record shows
The A33 carries 411 recorded injury collisions over the period, 91 of them serious or fatal. Serious injury concentrates in Southampton, Basingstoke and Deane, Reading, with 3 further areas also recording collisions. Collisions here are more likely than average to be fatal: 10% against 7% across the numbered network, which usually points to higher speeds. Most collisions were recorded on 30 mph sections. The worst year of the period was 2025 with 26 serious collisions, and the count is up 53% between 2021 and 2025.
Every serious and fatal collision on the A33
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
- Southampton46 KSI
- Basingstoke and Deane20 KSI
- Reading9 KSI
- Wokingham8 KSI
- Winchester6 KSI
- Hart2 KSI
Local authority areas with the most serious collisions on this road.
The trend
Serious and fatal collisions on the A33
2025: 26 (up 23.8% on the year before) · peak 26 in 2025 · +52.9% across the period
Axis clipped to the data range to show year-on-year movement.
About the A33
How many accidents happen on the A33?
Police recorded 411 injury collisions on the A33 over 2021–2025, of which 91 were fatal or serious. Those serious collisions left 96 people killed or seriously injured, including 9 fatal collisions.
Is the A33 a dangerous road?
By volume of serious injury it ranks 140 of the 150 numbered roads we analyse, and 130 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 A33 do collisions happen?
They concentrate in Southampton, Basingstoke and Deane, Reading. 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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