Skip to main content
CrashStats

A408 accidents: crash map and statistics

Police recorded 3,258 collisions on the A408 from 1979 to 2025, with 4,158 casualties. Of those crashes, 28 were fatal and 467 serious, and 29 people were killed.

In 2025 there were 37 collisions on the A408, down 18% from 45 in 2024, with 53 casualties.

Collisions since 1979
3,258
346th highest of 4,923 roads
Casualties
4,158
1.28 per collision
Fatal collisions
28
29 people killed
Serious collisions
467
526 seriously injured
Collisions in 2025
37
Down 18% on 2024
Casualties in 2025
53
Down 17% on 2024

Crash severity on the A408

On the A408, 0.9% of collisions were fatal and 14% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal280.9%
  • Serious46714%
  • Slight2,76385%

Where the A408 ranks among 4,923 roads

Most collisions
346th
Most casualties
372nd
Most fatal collisions
715th
Most serious collisions
459th

A408 accidents by year

Collisions on the A408 peaked at 131 in 1979 and were down to 37 in 2025.

Collisions and casualties on the A408, 1979 to 2025

  • Collisions
  • Collisions in 2025: 37
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20253753
20244564
20234959
20225071
20214554
20203545
20193648
20184150
20175271
20165366
20155674
20144864
20133447
20124761
20114255
20104060
20094062
20084964
20073950
20065261
20055069
20046292
20037199
200282109
200182112
200082119
199979105
19986989
1997100120
199689107
199586107
199488119
1993102136
199283105
1991105131
199088108
198991102
19887589
19877484
198689105
198584103
198490101
1983100110
198293124
1981100121
1980123143
1979131170

When crashes happen on the A408

Thursday has the most collisions on the A408 (537), and 3pm to 6pm is the busiest time of day (737).

Collisions by day of the week

  • Monday484 (15%)
  • Tuesday491 (15%)
  • Wednesday499 (15%)
  • Thursday537 (16%)
  • Friday527 (16%)
  • Saturday396 (12%)
  • Sunday324 (9.9%)

Collisions by time of day

  • Midnight to 3am100 (3.1%)
  • 3am to 6am58 (1.8%)
  • 6am to 9am412 (13%)
  • 9am to noon453 (14%)
  • Noon to 3pm623 (19%)
  • 3pm to 6pm737 (23%)
  • 6pm to 9pm537 (16%)
  • 9pm to midnight338 (10%)

Collisions by month

  • January283 (8.7%)
  • February224 (6.9%)
  • March275 (8.4%)
  • April237 (7.3%)
  • May248 (7.6%)
  • June263 (8.1%)
  • July282 (8.7%)
  • August246 (7.6%)
  • September301 (9.2%)
  • October306 (9.4%)
  • November305 (9.4%)
  • December288 (8.8%)

Light conditions at the time

  • Daylight2,305 (71%)
  • Dark, street lights lit917 (28%)
  • Dark, lighting unknown17 (0.5%)
  • Dark, street lights unlit13 (0.4%)
  • Dark, no street lighting6 (0.2%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A408 crashes

On the A408, 80% of collisions happened where the speed limit was 30 mph and 73% on a dry road surface.

Speed limit at the scene

  • 20 mph14 (0.4%)
  • 30 mph2,617 (80%)
  • 40 mph267 (8.2%)
  • 50 mph259 (7.9%)
  • 60 mph43 (1.3%)
  • 70 mph58 (1.8%)

Weather at the time

  • Fine, no high winds2,394 (73%)
  • Raining, no high winds434 (13%)
  • Fine with high winds26 (0.8%)
  • Raining with high winds16 (0.5%)
  • Other360 (11%)
  • Not recorded28 (0.9%)

Road surface

  • Dry2,371 (73%)
  • Wet or damp832 (26%)
  • Frost or ice30 (0.9%)
  • Snow13 (0.4%)
  • Other3 (0.1%)
  • Not recorded9 (0.3%)

Type of road

  • Single carriageway1,946 (60%)
  • Dual carriageway682 (21%)
  • Roundabout458 (14%)
  • One way street or slip road36 (1.1%)
  • Not recorded136 (4.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A408 crashes

Car occupants make up 60% of the people killed or injured on the A408, followed by pedestrians (12%).

Casualties by road user

  • Car occupant2,488 (60%)
  • Pedestrian502 (12%)
  • Motorcyclist475 (11%)
  • Cyclist403 (9.7%)
  • Bus or coach occupant126 (3%)
  • Van occupant97 (2.3%)
  • Other65 (1.6%)
  • Not recorded2 (under 0.1%)

Vehicles involved

  • Car4,348 (73%)
  • Motorcycle503 (8.4%)
  • Pedal cycle404 (6.8%)
  • Van or goods vehicle up to 3.5 tonnes351 (5.9%)
  • Bus or coach146 (2.4%)
  • Goods vehicle over 3.5 tonnes131 (2.2%)
  • Taxi or private hire car48 (0.8%)
  • Other43 (0.7%)

Casualties by age

  • 0 to 591 (2.2%)
  • 6 to 10112 (2.7%)
  • 11 to 15174 (4.2%)
  • 16 to 20600 (14%)
  • 21 to 25592 (14%)
  • 26 to 35875 (21%)
  • 36 to 45564 (14%)
  • 46 to 55443 (11%)
  • 56 to 65231 (5.6%)
  • 66 to 75126 (3%)
  • Over 75102 (2.5%)
  • Not recorded248 (6%)

Drivers, passengers and pedestrians

  • Driver or rider2,677 (64%)
  • Passenger979 (24%)
  • Pedestrian502 (12%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A408

Map of the 25 most recent crashes on the A408

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

  • 25 crashes
  • Serious
  • Slight

A408 crashes by council area

Collisions on the A408 were recorded in 3 council areas. Hillingdon has the most, with 3,243, followed by Hounslow (4) and Isle of Anglesey (3).

Collisions on the A408 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stHillingdon3,2434,14228464
2ndHounslow4400
3rdIsle of Anglesey3301

A408 crashes by town

Collisions on the A408 were recorded in 2 towns and built-up areas, led by Hillingdon (2,489) and Waltham Forest (5).

Recent crashes on the A408

These are the 25 most recent collisions on the A408, from 27 April to 29 December 2025.

Severity