The A21: where people are seriously hurt
Over 2021–2025, 284 people were killed or seriously injured in 257 collisions on the A21, making it the 31th worst numbered road in Britain by that measure.
257
serious or fatal collisions
284
people killed or seriously injured
17
collisions that took a life
#31
of 150 numbered roads
What the record shows
The A21 carries 1,150 recorded injury collisions over the period, 257 of them serious or fatal. Serious injury concentrates in Lewisham, Rother, Bromley, with 3 further areas also recording collisions. Its fatal share, 7%, sits close to the 7% average for the numbered network. Most collisions were recorded on 30 mph sections. The worst year of the period was 2025 with 56 serious collisions, and the count is up 27% between 2021 and 2025.
Every serious and fatal collision on the A21
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
- Lewisham78 KSI
- Rother57 KSI
- Bromley45 KSI
- Tunbridge Wells31 KSI
- Hastings26 KSI
- Sevenoaks11 KSI
Local authority areas with the most serious collisions on this road.
The trend
Serious and fatal collisions on the A21
2025: 56 (up 9.8% on the year before) · peak 56 in 2025 · +27.3% across the period
Axis clipped to the data range to show year-on-year movement.
About the A21
How many accidents happen on the A21?
Police recorded 1,150 injury collisions on the A21 over 2021–2025, of which 257 were fatal or serious. Those serious collisions left 284 people killed or seriously injured, including 17 fatal collisions.
Is the A21 a dangerous road?
By volume of serious injury it ranks 31 of the 150 numbered roads we analyse, and 28 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 A21 do collisions happen?
They concentrate in Lewisham, Rother, Bromley. 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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