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CrashStats

B401 accidents: crash map and statistics

Police recorded 508 collisions on the B401 from 1979 to 2025, with 530 casualties. Of those crashes, 4 were fatal and 77 serious, and 4 people were killed.

In 2025 there were 6 collisions on the B401, down 14% from 7 in 2024, with 6 casualties.

Collisions since 1979
508
1,943rd highest of 4,923 roads
Casualties
530
1.04 per collision
Fatal collisions
4
4 people killed
Serious collisions
77
79 seriously injured
Collisions in 2025
6
Down 14% on 2024
Casualties in 2025
6
Down 14% on 2024

Crash severity on the B401

On the B401, 0.8% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal40.8%
  • Serious7715%
  • Slight42784%

Where the B401 ranks among 4,923 roads

Most collisions
1,943rd
Most casualties
2,329th
Most fatal collisions
2,815th
Most serious collisions
2,343rd

B401 accidents by year

Collisions on the B401 peaked at 21 in 1989 and were down to 6 in 2025.

Collisions and casualties on the B401, 1979 to 2025

  • Collisions
  • Collisions in 2025: 6
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202566
202477
202366
20221011
2021710
202022
20191112
2018910
201766
201677
201511
201488
201366
20121313
201188
201022
200977
200866
200766
200633
200555
20041111
20031010
20021415
20011212
20001315
19991718
199811
1997910
199699
19951515
19941516
19931313
19921314
19911616
19901618
19892122
19882023
19871818
19862121
19851717
19841616
19831919
19821314
19811920
19801415
19791010

When crashes happen on the B401

Friday has the most collisions on the B401 (102), and noon to 3pm is the busiest time of day (119).

Collisions by day of the week

  • Monday64 (13%)
  • Tuesday80 (16%)
  • Wednesday89 (18%)
  • Thursday93 (18%)
  • Friday102 (20%)
  • Saturday53 (10%)
  • Sunday27 (5.3%)

Collisions by time of day

  • Midnight to 3am21 (4.1%)
  • 3am to 6am5 (1%)
  • 6am to 9am27 (5.3%)
  • 9am to noon83 (16%)
  • Noon to 3pm119 (23%)
  • 3pm to 6pm109 (21%)
  • 6pm to 9pm81 (16%)
  • 9pm to midnight63 (12%)

Collisions by month

  • January38 (7.5%)
  • February30 (5.9%)
  • March39 (7.7%)
  • April43 (8.5%)
  • May44 (8.7%)
  • June61 (12%)
  • July45 (8.9%)
  • August47 (9.3%)
  • September29 (5.7%)
  • October47 (9.3%)
  • November46 (9.1%)
  • December39 (7.7%)

Light conditions at the time

  • Daylight363 (71%)
  • Dark, street lights lit138 (27%)
  • Dark, lighting unknown4 (0.8%)
  • Dark, street lights unlit2 (0.4%)
  • Dark, no street lighting1 (0.2%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B401 crashes

On the B401, 92% of collisions happened where the speed limit was 30 mph and 79% on a dry road surface.

Speed limit at the scene

  • 20 mph40 (7.9%)
  • 30 mph468 (92%)

Weather at the time

  • Fine, no high winds387 (76%)
  • Raining, no high winds59 (12%)
  • Fine with high winds5 (1%)
  • Raining with high winds2 (0.4%)
  • Other45 (8.9%)
  • Not recorded10 (2%)

Road surface

  • Dry401 (79%)
  • Wet or damp100 (20%)
  • Snow2 (0.4%)
  • Frost or ice1 (0.2%)
  • Not recorded4 (0.8%)

Type of road

  • Single carriageway317 (62%)
  • One way street or slip road126 (25%)
  • Dual carriageway13 (2.6%)
  • Roundabout11 (2.2%)
  • Not recorded41 (8.1%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B401 crashes

Pedestrians make up 45% of the people killed or injured on the B401, followed by cyclists (28%).

Casualties by road user

  • Pedestrian236 (45%)
  • Cyclist146 (28%)
  • Motorcyclist73 (14%)
  • Car occupant43 (8.1%)
  • Taxi or private hire car occupant23 (4.3%)
  • Bus or coach occupant3 (0.6%)
  • Van occupant2 (0.4%)
  • Other4 (0.8%)

Vehicles involved

  • Car283 (37%)
  • Pedal cycle153 (20%)
  • Taxi or private hire car132 (17%)
  • Motorcycle102 (13%)
  • Van or goods vehicle up to 3.5 tonnes67 (8.7%)
  • Goods vehicle over 3.5 tonnes11 (1.4%)
  • Bus or coach9 (1.2%)
  • Other11 (1.4%)

Casualties by age

  • 0 to 52 (0.4%)
  • 6 to 105 (0.9%)
  • 11 to 156 (1.1%)
  • 16 to 2032 (6%)
  • 21 to 2583 (16%)
  • 26 to 35140 (26%)
  • 36 to 4582 (15%)
  • 46 to 5563 (12%)
  • 56 to 6528 (5.3%)
  • 66 to 7518 (3.4%)
  • Over 7510 (1.9%)
  • Not recorded61 (12%)

Drivers, passengers and pedestrians

  • Driver or rider255 (48%)
  • Pedestrian236 (45%)
  • Passenger39 (7.4%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B401

Map of the 25 most recent crashes on the B401

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

  • 25 crashes
  • Serious
  • Slight

B401 crashes by council area

Collisions on the B401 were recorded in 2 council areas. Westminster has the most, with 416, followed by Camden (91).

Collisions on the B401 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stWestminster416435363
2ndCamden9194114

B401 crashes by town

Collisions on the B401 were recorded in 2 towns and built-up areas, led by City of Westminster (324) and Camden (140).

Recent crashes on the B401

These are the 25 most recent collisions on the B401, from 3 August 2022 to 19 December 2025.

Severity