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CrashStats

A4090 accidents: crash map and statistics

Police recorded 2,580 collisions on the A4090 from 1979 to 2025, with 3,280 casualties. Of those crashes, 26 were fatal and 375 serious, and 27 people were killed.

In 2025 there were 25 collisions on the A4090, level with 2024, with 32 casualties.

Collisions since 1979
2,580
454th highest of 4,923 roads
Casualties
3,280
1.27 per collision
Fatal collisions
26
27 people killed
Serious collisions
375
405 seriously injured
Collisions in 2025
25
Level with 2024
Casualties in 2025
32
Up 19% on 2024

Crash severity on the A4090

On the A4090, 1% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal261%
  • Serious37515%
  • Slight2,17984%

Where the A4090 ranks among 4,923 roads

Most collisions
454th
Most casualties
491st
Most fatal collisions
771st
Most serious collisions
575th

A4090 accidents by year

Collisions on the A4090 peaked at 106 in 1981 and were down to 25 in 2025.

Collisions and casualties on the A4090, 1979 to 2025

  • Collisions
  • Collisions in 2025: 25
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20252532
20242527
20233136
20223134
20213540
20202435
20194150
20183242
20174253
20165886
20153139
20144253
20132028
20122634
20113239
20103037
20093539
20083144
20073447
20064762
20054456
20046079
20036283
20026988
20016686
20006384
19996989
19985866
199775101
199677102
19957598
19946884
19936474
19927183
19915870
19906479
19897894
19886384
19877696
19868197
19856994
19847793
19837796
19827291
1981106143
198082105
197984108

When crashes happen on the A4090

Friday has the most collisions on the A4090 (432), and 3pm to 6pm is the busiest time of day (522).

Collisions by day of the week

  • Monday339 (13%)
  • Tuesday355 (14%)
  • Wednesday362 (14%)
  • Thursday401 (16%)
  • Friday432 (17%)
  • Saturday363 (14%)
  • Sunday328 (13%)

Collisions by time of day

  • Midnight to 3am125 (4.8%)
  • 3am to 6am51 (2%)
  • 6am to 9am350 (14%)
  • 9am to noon316 (12%)
  • Noon to 3pm369 (14%)
  • 3pm to 6pm522 (20%)
  • 6pm to 9pm481 (19%)
  • 9pm to midnight366 (14%)

Collisions by month

  • January220 (8.5%)
  • February172 (6.7%)
  • March210 (8.1%)
  • April210 (8.1%)
  • May215 (8.3%)
  • June217 (8.4%)
  • July203 (7.9%)
  • August205 (7.9%)
  • September226 (8.8%)
  • October226 (8.8%)
  • November244 (9.5%)
  • December232 (9%)

Light conditions at the time

  • Daylight1,632 (63%)
  • Dark, street lights lit904 (35%)
  • Dark, lighting unknown29 (1.1%)
  • Dark, street lights unlit13 (0.5%)
  • Dark, no street lighting2 (0.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4090 crashes

On the A4090, 91% of collisions happened where the speed limit was 30 mph and 73% on a dry road surface.

Speed limit at the scene

  • 20 mph84 (3.3%)
  • 30 mph2,343 (91%)
  • 40 mph147 (5.7%)
  • 50 mph4 (0.2%)
  • 60 mph1 (under 0.1%)
  • 70 mph1 (under 0.1%)

Weather at the time

  • Fine, no high winds1,884 (73%)
  • Raining, no high winds360 (14%)
  • Fine with high winds18 (0.7%)
  • Snowing, no high winds13 (0.5%)
  • Other269 (10%)
  • Not recorded36 (1.4%)

Road surface

  • Dry1,882 (73%)
  • Wet or damp637 (25%)
  • Frost or ice31 (1.2%)
  • Snow16 (0.6%)
  • Flood over 3cm deep1 (under 0.1%)
  • Not recorded13 (0.5%)

Type of road

  • Single carriageway1,885 (73%)
  • Dual carriageway428 (17%)
  • Roundabout68 (2.6%)
  • One way street or slip road27 (1%)
  • Not recorded172 (6.7%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4090 crashes

Car occupants make up 61% of the people killed or injured on the A4090, followed by pedestrians (15%).

Casualties by road user

  • Car occupant1,988 (61%)
  • Pedestrian481 (15%)
  • Motorcyclist414 (13%)
  • Cyclist220 (6.7%)
  • Van occupant85 (2.6%)
  • Bus or coach occupant41 (1.3%)
  • Other49 (1.5%)
  • Not recorded2 (0.1%)

Vehicles involved

  • Car3,737 (78%)
  • Motorcycle427 (8.9%)
  • Van or goods vehicle up to 3.5 tonnes251 (5.2%)
  • Pedal cycle222 (4.6%)
  • Bus or coach55 (1.1%)
  • Goods vehicle over 3.5 tonnes55 (1.1%)
  • Taxi or private hire car29 (0.6%)
  • Other33 (0.7%)

Casualties by age

  • 0 to 544 (1.3%)
  • 6 to 1088 (2.7%)
  • 11 to 15163 (5%)
  • 16 to 20441 (13%)
  • 21 to 25447 (14%)
  • 26 to 35708 (22%)
  • 36 to 45451 (14%)
  • 46 to 55332 (10%)
  • 56 to 65202 (6.2%)
  • 66 to 75109 (3.3%)
  • Over 7598 (3%)
  • Not recorded197 (6%)

Drivers, passengers and pedestrians

  • Driver or rider2,031 (62%)
  • Passenger768 (23%)
  • Pedestrian481 (15%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4090

Map of the 25 most recent crashes on the A4090

Use the arrow keys to move the map and the plus and minus keys to zoom.

  • 25 crashes
  • Serious
  • Slight

A4090 crashes by council area

Collisions on the A4090 were recorded in 3 council areas. Harrow has the most, with 1,652, followed by Ealing (881) and Brent (46).

Collisions on the A4090 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stHarrow1,6522,08120246
2ndEaling8811,1316123
3rdBrent466706

A4090 crashes by town

Collisions on the A4090 were recorded in 2 towns and built-up areas, led by Harrow (1,468) and Ealing (821).

Recent crashes on the A4090

These are the 25 most recent collisions on the A4090, from 8 January to 22 November 2025.

Severity