The A4020: where people are seriously hurt
Over 2021–2025, 174 people were killed or seriously injured in 169 collisions on the A4020, making it the 57th worst numbered road in Britain by that measure.
169
serious or fatal collisions
174
people killed or seriously injured
4
collisions that took a life
#57
of 150 numbered roads
What the record shows
The A4020 carries 1,172 recorded injury collisions over the period, 169 of them serious or fatal. Serious injury concentrates in Ealing, Hillingdon, Hammersmith and Fulham, with 1 further areas also recording collisions. Collisions here are less likely than average to be fatal (2% against 7%), typical of lower-speed urban sections. Most collisions were recorded on 20 mph sections. The worst year of the period was 2022 with 43 serious collisions, and the count is up 18% between 2021 and 2025.
Every serious and fatal collision on the A4020
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
- Ealing92 KSI
- Hillingdon48 KSI
- Hammersmith and Fulham27 KSI
- Buckinghamshire2 KSI
Local authority areas with the most serious collisions on this road.
The trend
Serious and fatal collisions on the A4020
2025: 33 (up 10% on the year before) · peak 43 in 2022 · +17.9% across the period
Axis clipped to the data range to show year-on-year movement.
About the A4020
How many accidents happen on the A4020?
Police recorded 1,172 injury collisions on the A4020 over 2021–2025, of which 169 were fatal or serious. Those serious collisions left 174 people killed or seriously injured, including 4 fatal collisions.
Is the A4020 a dangerous road?
By volume of serious injury it ranks 57 of the 150 numbered roads we analyse, and 51 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 A4020 do collisions happen?
They concentrate in Ealing, Hillingdon, Hammersmith and Fulham. 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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