Serious
Van crash on the B400 in West Berkshire, 31 Mar 2025, 16:10
- Van or goods vehicle up to 3.5 tonnes and a pedal cycle
- 2 vehicles, 1 casualty
Ref 2025430156375
B400 accidents: crash map and statistics
Police recorded 68 collisions on the B400 from 1979 to 2025, with 69 casualties. Of those crashes, 2 were fatal and 10 serious, and 2 people were killed.
In 2025 there was 1 collision on the B400, up from none in 2024, with 1 casualty.
- Collisions since 1979
- 68
- 4,387th highest of 4,923 roads
- Casualties
- 69
- 1.01 per collision
- Fatal collisions
- 2
- 2 people killed
- Serious collisions
- 10
- 10 seriously injured
- Collisions in 2025
- 1
- Up from none in 2024
- Casualties in 2025
- 1
- Up from none in 2024
Crash severity on the B400
On the B400, 2.9% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.
Collisions by severity, 1979 to 2025
- Fatal22.9%
- Serious1015%
- Slight5682%
Where the B400 ranks among 4,923 roads
- Most collisions
- 4,387th
- Most casualties
- 4,593rd
- Most fatal collisions
- 3,485th
- Most serious collisions
- 4,617th
B400 accidents by year
Collisions on the B400 peaked at 7 in 2023 and were down to 1 in 2025.
Collisions and casualties on the B400, 1979 to 2025
- Collisions
- Collisions in 2025: 1
- Casualties
Source: Department for Transport, STATS19 road safety data
View as a tableHide the table
| Year | Collisions | Casualties |
|---|---|---|
| 2025 | 1 | 1 |
| 2024 | 0 | 0 |
| 2023 | 7 | 7 |
| 2022 | 0 | 0 |
| 2021 | 0 | 0 |
| 2020 | 0 | 0 |
| 2019 | 2 | 2 |
| 2018 | 2 | 2 |
| 2017 | 1 | 1 |
| 2016 | 1 | 1 |
| 2015 | 0 | 0 |
| 2014 | 0 | 0 |
| 2013 | 1 | 1 |
| 2012 | 1 | 1 |
| 2011 | 2 | 2 |
| 2010 | 0 | 0 |
| 2009 | 0 | 0 |
| 2008 | 0 | 0 |
| 2007 | 0 | 0 |
| 2006 | 2 | 2 |
| 2005 | 4 | 4 |
| 2004 | 1 | 1 |
| 2003 | 1 | 1 |
| 2002 | 0 | 0 |
| 2001 | 3 | 4 |
| 2000 | 0 | 0 |
| 1999 | 1 | 1 |
| 1998 | 2 | 2 |
| 1997 | 0 | 0 |
| 1996 | 1 | 1 |
| 1995 | 2 | 2 |
| 1994 | 0 | 0 |
| 1993 | 3 | 3 |
| 1992 | 0 | 0 |
| 1991 | 1 | 1 |
| 1990 | 1 | 1 |
| 1989 | 2 | 2 |
| 1988 | 4 | 4 |
| 1987 | 2 | 2 |
| 1986 | 2 | 2 |
| 1985 | 1 | 1 |
| 1984 | 5 | 5 |
| 1983 | 1 | 1 |
| 1982 | 1 | 1 |
| 1981 | 1 | 1 |
| 1980 | 4 | 4 |
| 1979 | 5 | 5 |
When crashes happen on the B400
Friday has the most collisions on the B400 (15), and 3pm to 6pm is the busiest time of day (17).
Collisions by day of the week
- Monday14 (21%)
- Tuesday11 (16%)
- Wednesday11 (16%)
- Thursday10 (15%)
- Friday15 (22%)
- Saturday4 (5.9%)
- Sunday3 (4.4%)
Collisions by time of day
- Midnight to 3am4 (5.9%)
- 3am to 6am0 (0%)
- 6am to 9am5 (7.4%)
- 9am to noon14 (21%)
- Noon to 3pm15 (22%)
- 3pm to 6pm17 (25%)
- 6pm to 9pm11 (16%)
- 9pm to midnight2 (2.9%)
Collisions by month
- January8 (12%)
- February6 (8.8%)
- March11 (16%)
- April8 (12%)
- May4 (5.9%)
- June5 (7.4%)
- July7 (10%)
- August4 (5.9%)
- September4 (5.9%)
- October5 (7.4%)
- November2 (2.9%)
- December4 (5.9%)
Light conditions at the time
- Daylight56 (82%)
- Dark, street lights lit12 (18%)
Source: Department for Transport, STATS19 road safety data
Road and weather conditions in B400 crashes
On the B400, 79% of collisions happened where the speed limit was 30 mph and 81% on a dry road surface.
Speed limit at the scene
- 20 mph10 (15%)
- 30 mph54 (79%)
- 40 mph2 (2.9%)
- 60 mph2 (2.9%)
Weather at the time
- Fine, no high winds45 (66%)
- Raining, no high winds6 (8.8%)
- Fine with high winds1 (1.5%)
- Other11 (16%)
- Not recorded5 (7.4%)
Road surface
- Dry55 (81%)
- Wet or damp9 (13%)
- Snow1 (1.5%)
- Not recorded3 (4.4%)
Type of road
- One way street or slip road32 (47%)
- Single carriageway31 (46%)
- Dual carriageway2 (2.9%)
- Not recorded3 (4.4%)
Source: Department for Transport, STATS19 road safety data
People hurt and vehicles involved in B400 crashes
Pedestrians make up 38% of the people killed or injured on the B400, followed by motorcyclists (28%).
Casualties by road user
- Pedestrian26 (38%)
- Motorcyclist19 (28%)
- Car occupant9 (13%)
- Cyclist8 (12%)
- Bus or coach occupant5 (7.2%)
- Taxi or private hire car occupant1 (1.4%)
- Van occupant1 (1.4%)
Vehicles involved
- Car33 (34%)
- Motorcycle22 (22%)
- Taxi or private hire car13 (13%)
- Van or goods vehicle up to 3.5 tonnes11 (11%)
- Pedal cycle10 (10%)
- Bus or coach6 (6.1%)
- Goods vehicle over 3.5 tonnes3 (3.1%)
Casualties by age
- 0 to 51 (1.4%)
- 16 to 205 (7.2%)
- 21 to 2510 (14%)
- 26 to 3524 (35%)
- 36 to 4513 (19%)
- 46 to 556 (8.7%)
- 56 to 653 (4.3%)
- Over 752 (2.9%)
- Not recorded5 (7.2%)
Drivers, passengers and pedestrians
- Driver or rider33 (48%)
- Pedestrian26 (38%)
- Passenger10 (14%)
Source: Department for Transport, STATS19 road safety data
Map of recent crashes on the B400
Map of the 24 most recent crashes on the B400
Use the arrow keys to move the map and the plus and minus keys to zoom.
- 24 crashes
- Fatal
- Serious
- Slight
B400 crashes by council area
Collisions on the B400 were recorded in 3 council areas. City of London has the most, with 24, followed by Westminster (23) and Camden (16).
| Rank | Area | Collisions | Casualties | Fatal | Serious |
|---|---|---|---|---|---|
| 1st | City of London | 24 | 25 | 1 | 4 |
| 2nd | Westminster | 23 | 23 | 0 | 2 |
| 3rd | Camden | 16 | 16 | 0 | 1 |
B400 crashes by town
Collisions on the B400 were recorded in 2 towns and built-up areas, led by Camden (45) and City of Westminster (7).
Recent crashes on the B400
These are the 25 most recent collisions on the B400, from 24 September 2004 to 31 March 2025.
Severity
- Slight
Mercedes Sprinter crash on the B400 in Westminster, 13 Nov 2023, 16:00
- Mercedes Sprinter and Yamaha YP
- 2 vehicles, 1 casualty
Ref 2023010477731
- Slight
Nissan Leaf crash on the B400 in Westminster, 23 Oct 2023, 18:28
- Nissan Leaf, a pedal cycle and BMW 5 Series
- 3 vehicles, 1 casualty
Ref 2023010473754
- Serious
Yamaha YP crash on the B400 in Westminster, 28 Jun 2023, 07:15
- 1 vehicle, 1 casualty
Ref 2023010451912
- Slight
London Taxis Int. TX4 crash on the B400 in Westminster, 28 Apr 2023, 18:45
- London Taxis Int. TX4 and a motorcycle 125cc and under
- 2 vehicles, 1 casualty
Ref 2023010440479
- Slight
Bicycle crash on the B400 in Westminster, 4 Apr 2023, 07:59
- 1 vehicle, 1 casualty
Ref 2023010435815
- Slight
Honda SH 125 crash on the B400 in Westminster, 28 Feb 2023, 18:45
- Honda SH 125 and London Taxis Int. TX4
- 2 vehicles, 1 casualty
Ref 2023010440483
- Slight
Bicycle crash on the B400 in Westminster, 14 Feb 2023, 06:50
- Pedal cycle and a car
- 2 vehicles, 1 casualty
Ref 2023010433347
- Slight
Bicycle crash on the B400 in Camden, 21 Oct 2019, 15:40
- 1 vehicle, 1 casualty
Ref 2019010213141
- Slight
Bicycle crash on the B400 in Westminster, 7 May 2019, 11:40
- Pedal cycle and a goods vehicle 7.5 tonnes and over
- 2 vehicles, 1 casualty
Ref 2019010862734
- Serious
Fiat Ducato crash on the B400 in Swindon, 24 Sep 2018, 12:04
- 1 vehicle, 1 casualty
Ref 2018549027018
- Slight
Toyota Prius+ crash on the B400 in Camden, 21 Apr 2018, 22:30
- Toyota Prius+ and Honda CB600 Hornet
- 2 vehicles, 1 casualty
Ref 2018010103208
- Slight
Bicycle crash on the B400 in Camden, 2 Mar 2017, 18:30
- 1 vehicle, 1 casualty
Ref 2017010023435
- Slight
Yamaha YP 125 crash on the B400 in the City of London, 7 Jul 2016, 12:00
- Yamaha YP 125 and Ford Galaxy
- 2 vehicles, 1 casualty
Ref 2016480096137
- Slight
Van crash on the B400 in the City of London, 2 May 2013, 15:05
- 1 vehicle, 1 casualty
Ref 201301CP00097
- Fatal
Ford Galaxy crash on the B400 in the City of London, 6 Oct 2012, 00:15
- 1 vehicle, 1 casualty
Ref 201201CP00377
- Slight
Car crash on the B400 in the City of London, 9 Sep 2011, 13:40
- 1 vehicle, 1 casualty
Ref 201101CP00261
- Slight
Honda CBF600N crash on the B400 in the City of London, 26 Jan 2011, 09:49
- 1 vehicle, 1 casualty
Ref 201101CW10009
- Serious
Motorcycle crash on the B400 in the City of London, 10 Mar 2006, 11:00
- Motorcycle over 500cc and a taxi or private hire car
- 2 vehicles, 1 casualty
Ref 200601CP00050
- Slight
Mercedes E Class crash on the B400 in the City of London, 3 Mar 2006, 02:30
- Mercedes E Class and Ford Mondeo
- 2 vehicles, 1 casualty
Ref 200601EO40275
- Serious
Mini Cooper crash on the B400 in the City of London, 25 Aug 2005, 18:21
- Mini Cooper and a motorcycle over 500cc
- 2 vehicles, 1 casualty
Ref 200501CP00186
- Fatal
Kawasaki ZX750 crash on the B400 in West Berkshire, 10 Jul 2005, 16:08
- Kawasaki ZX750 and a car
- 2 vehicles, 1 casualty
Ref 200543W004075
- Slight
Ford Mondeo crash on the B400 in Carmarthenshire, 28 May 2005, 15:42
- Ford Mondeo and Vauxhall Corsa
- 2 vehicles, 1 casualty
Ref 200563AC22205
- Slight
Mercedes crash on the B400 in the City of London, 4 Mar 2005, 16:41
- 1 vehicle, 1 casualty
Ref 200501EO40176
- Slight
Iveco-Ford crash on the B400 in Westminster, 24 Sep 2004, 08:40
- Iveco-Ford and a pedal cycle
- 2 vehicles, 1 casualty
Ref 200401CP00231