The A3: where people are seriously hurt
Over 2021–2025, 529 people were killed or seriously injured in 511 collisions on the A3, making it the 7th worst numbered road in Britain by that measure.
511
serious or fatal collisions
529
people killed or seriously injured
18
collisions that took a life
#7
of 150 numbered roads
What the record shows
The A3 carries 2,341 recorded injury collisions over the period, 511 of them serious or fatal. Serious injury concentrates in Lambeth, Wandsworth, Guildford, with 3 further areas also recording collisions. Collisions here are less likely than average to be fatal (4% against 7%), typical of lower-speed urban sections. Most collisions were recorded on 20 mph sections. The worst year of the period was 2023 with 119 serious collisions, and the count is down 13% between 2021 and 2025.
Every serious and fatal collision on the A3
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
- Lambeth98 KSI
- Wandsworth91 KSI
- Guildford74 KSI
- Southwark71 KSI
- East Hampshire44 KSI
- Portsmouth43 KSI
Local authority areas with the most serious collisions on this road.
The trend
Serious and fatal collisions on the A3
2025: 90 (up 4.7% on the year before) · peak 119 in 2023 · -13.5% across the period
Axis clipped to the data range to show year-on-year movement.
About the A3
How many accidents happen on the A3?
Police recorded 2,341 injury collisions on the A3 over 2021–2025, of which 511 were fatal or serious. Those serious collisions left 529 people killed or seriously injured, including 18 fatal collisions.
Is the A3 a dangerous road?
By volume of serious injury it ranks 7 of the 150 numbered roads we analyse, and 7 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 A3 do collisions happen?
They concentrate in Lambeth, Wandsworth, Guildford. 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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