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CrashStats

B404 accidents: crash map and statistics

Police recorded 329 collisions on the B404 from 1979 to 2025, with 355 casualties. Of those crashes, none were fatal and 31 were serious.

In 2025 there was 1 collision on the B404, level with 2024, with 1 casualty.

Collisions since 1979
329
2,562nd highest of 4,923 roads
Casualties
355
1.08 per collision
Fatal collisions
0
No one killed
Serious collisions
31
31 seriously injured
Collisions in 2025
1
Level with 2024
Casualties in 2025
1
Level with 2024

Crash severity on the B404

None of the 329 collisions on the B404 were fatal, and 9.4% were serious (18% across Great Britain).

Collisions by severity, 1979 to 2025

  • Fatal00%
  • Serious319.4%
  • Slight29891%

Where the B404 ranks among 4,923 roads

Most collisions
2,562nd
Most casualties
2,894th
Most fatal collisions
4,444th
Most serious collisions
3,580th

B404 accidents by year

Collisions on the B404 peaked at 19 in 1982 and were down to 1 in 2025.

Collisions and casualties on the B404, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202411
202322
202211
202133
202022
201944
201866
201733
201644
201588
201411
201333
201233
201155
201022
200922
200833
200744
200633
200568
200411
200344
2002710
20011010
20001518
199978
199866
19971212
19961111
199555
19941212
19931617
1992910
199177
19901617
198967
198877
198799
19861011
198599
198466
19831414
19821919
19811215
19801316
19791925

When crashes happen on the B404

Wednesday has the most collisions on the B404 (65), and 3pm to 6pm is the busiest time of day (76).

Collisions by day of the week

  • Monday51 (16%)
  • Tuesday54 (16%)
  • Wednesday65 (20%)
  • Thursday42 (13%)
  • Friday62 (19%)
  • Saturday31 (9.4%)
  • Sunday24 (7.3%)

Collisions by time of day

  • Midnight to 3am27 (8.2%)
  • 3am to 6am7 (2.1%)
  • 6am to 9am20 (6.1%)
  • 9am to noon40 (12%)
  • Noon to 3pm63 (19%)
  • 3pm to 6pm76 (23%)
  • 6pm to 9pm54 (16%)
  • 9pm to midnight42 (13%)

Collisions by month

  • January23 (7%)
  • February16 (4.9%)
  • March34 (10%)
  • April29 (8.8%)
  • May31 (9.4%)
  • June23 (7%)
  • July29 (8.8%)
  • August35 (11%)
  • September21 (6.4%)
  • October38 (12%)
  • November34 (10%)
  • December16 (4.9%)

Light conditions at the time

  • Daylight216 (66%)
  • Dark, street lights lit109 (33%)
  • Dark, lighting unknown3 (0.9%)
  • Dark, street lights unlit1 (0.3%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B404 crashes

On the B404, 96% of collisions happened where the speed limit was 30 mph and 79% on a dry road surface.

Speed limit at the scene

  • 20 mph10 (3%)
  • 30 mph317 (96%)
  • 40 mph2 (0.6%)

Weather at the time

  • Fine, no high winds238 (72%)
  • Raining, no high winds37 (11%)
  • Fine with high winds3 (0.9%)
  • Raining with high winds1 (0.3%)
  • Other44 (13%)
  • Not recorded6 (1.8%)

Road surface

  • Dry259 (79%)
  • Wet or damp67 (20%)
  • Not recorded3 (0.9%)

Type of road

  • One way street or slip road171 (52%)
  • Single carriageway109 (33%)
  • Roundabout15 (4.6%)
  • Dual carriageway7 (2.1%)
  • Not recorded27 (8.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B404 crashes

Pedestrians make up 50% of the people killed or injured on the B404, followed by motorcyclists (22%).

Casualties by road user

  • Pedestrian176 (50%)
  • Motorcyclist78 (22%)
  • Cyclist55 (15%)
  • Car occupant28 (7.9%)
  • Taxi or private hire car occupant12 (3.4%)
  • Van occupant3 (0.8%)
  • Bus or coach occupant2 (0.6%)
  • Other vehicle occupant1 (0.3%)

Vehicles involved

  • Car190 (39%)
  • Motorcycle104 (21%)
  • Taxi or private hire car68 (14%)
  • Pedal cycle60 (12%)
  • Van or goods vehicle up to 3.5 tonnes45 (9.2%)
  • Other vehicle11 (2.3%)
  • Goods vehicle over 3.5 tonnes5 (1%)
  • Other5 (1%)

Casualties by age

  • 6 to 101 (0.3%)
  • 11 to 153 (0.8%)
  • 16 to 2033 (9.3%)
  • 21 to 2565 (18%)
  • 26 to 35110 (31%)
  • 36 to 4555 (15%)
  • 46 to 5520 (5.6%)
  • 56 to 6523 (6.5%)
  • 66 to 7510 (2.8%)
  • Over 752 (0.6%)
  • Not recorded33 (9.3%)

Drivers, passengers and pedestrians

  • Pedestrian176 (50%)
  • Driver or rider154 (43%)
  • Passenger25 (7%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B404

Map of the 25 most recent crashes on the B404

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

  • 25 crashes
  • Serious
  • Slight

B404 crashes by council area

Collisions on the B404 were recorded in 4 council areas. Westminster has the most, with 262, followed by Camden (55) and Hillingdon (5).

Collisions on the B404 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stWestminster262282027
2ndCamden556002
3rdHillingdon5500
4thHarrow4502

B404 crashes by town

Collisions on the B404 were recorded in 2 towns and built-up areas, led by City of Westminster (206) and Camden (74).

Recent crashes on the B404

These are the 25 most recent collisions on the B404, from 18 October 2016 to 3 May 2025.

Severity