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CrashStats

A400 accidents: crash map and statistics

Police recorded 10,102 collisions on the A400 from 1979 to 2025, with 11,343 casualties. Of those crashes, 60 were fatal and 1,540 serious, and 60 people were killed.

In 2025 there were 109 collisions on the A400, up 7% from 102 in 2024, with 127 casualties.

Collisions since 1979
10,102
77th highest of 4,923 roads
Casualties
11,343
1.12 per collision
Fatal collisions
60
60 people killed
Serious collisions
1,540
1,609 seriously injured
Collisions in 2025
109
Up 7% on 2024
Casualties in 2025
127
Up 10% on 2024

Crash severity on the A400

On the A400, 0.6% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal600.6%
  • Serious1,54015%
  • Slight8,50284%

Where the A400 ranks among 4,923 roads

Most collisions
77th
Most casualties
108th
Most fatal collisions
353rd
Most serious collisions
106th

A400 accidents by year

Collisions on the A400 peaked at 357 in 1979 and were down to 109 in 2025.

Collisions and casualties on the A400, 1979 to 2025

  • Collisions
  • Collisions in 2025: 109
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
2025109127
2024102115
202395101
2022101104
2021104111
202097101
2019132146
2018134150
2017125135
2016138152
2015167201
2014164177
2013116125
2012115134
2011149168
2010158171
2009139150
2008143169
2007152174
2006140157
2005184202
2004191217
2003232263
2002232268
2001290329
2000255290
1999291331
1998257293
1997237263
1996274293
1995295340
1994245271
1993321362
1992260308
1991263293
1990273291
1989290306
1988285327
1987269293
1986294323
1985298322
1984305347
1983313347
1982350408
1981315378
1980346388
1979357422

When crashes happen on the A400

Friday has the most collisions on the A400 (1,653), and 3pm to 6pm is the busiest time of day (2,079).

Collisions by day of the week

  • Monday1,465 (15%)
  • Tuesday1,481 (15%)
  • Wednesday1,582 (16%)
  • Thursday1,637 (16%)
  • Friday1,653 (16%)
  • Saturday1,278 (13%)
  • Sunday1,006 (10%)

Collisions by time of day

  • Midnight to 3am721 (7.1%)
  • 3am to 6am306 (3%)
  • 6am to 9am828 (8.2%)
  • 9am to noon1,514 (15%)
  • Noon to 3pm1,820 (18%)
  • 3pm to 6pm2,079 (21%)
  • 6pm to 9pm1,602 (16%)
  • 9pm to midnight1,232 (12%)

Collisions by month

  • January722 (7.1%)
  • February773 (7.7%)
  • March880 (8.7%)
  • April711 (7%)
  • May837 (8.3%)
  • June846 (8.4%)
  • July940 (9.3%)
  • August831 (8.2%)
  • September892 (8.8%)
  • October997 (9.9%)
  • November876 (8.7%)
  • December797 (7.9%)

Light conditions at the time

  • Daylight6,592 (65%)
  • Dark, street lights lit3,379 (33%)
  • Dark, lighting unknown103 (1%)
  • Dark, street lights unlit20 (0.2%)
  • Dark, no street lighting8 (0.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A400 crashes

On the A400, 92% of collisions happened where the speed limit was 30 mph and 79% on a dry road surface.

Speed limit at the scene

  • 20 mph786 (7.8%)
  • 30 mph9,292 (92%)
  • 40 mph21 (0.2%)
  • 50 mph1 (under 0.1%)
  • 60 mph1 (under 0.1%)
  • 70 mph1 (under 0.1%)

Weather at the time

  • Fine, no high winds7,599 (75%)
  • Raining, no high winds1,179 (12%)
  • Fine with high winds64 (0.6%)
  • Raining with high winds46 (0.5%)
  • Other984 (9.7%)
  • Not recorded230 (2.3%)

Road surface

  • Dry8,004 (79%)
  • Wet or damp1,998 (20%)
  • Frost or ice31 (0.3%)
  • Snow23 (0.2%)
  • Other5 (under 0.1%)
  • Not recorded41 (0.4%)

Type of road

  • Single carriageway6,134 (61%)
  • One way street or slip road2,747 (27%)
  • Dual carriageway672 (6.7%)
  • Roundabout57 (0.6%)
  • Not recorded492 (4.9%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A400 crashes

Pedestrians make up 36% of the people killed or injured on the A400, followed by motorcyclists (19%).

Casualties by road user

  • Pedestrian4,061 (36%)
  • Motorcyclist2,175 (19%)
  • Car occupant1,998 (18%)
  • Cyclist1,755 (15%)
  • Bus or coach occupant847 (7.5%)
  • Taxi or private hire car occupant284 (2.5%)
  • Other211 (1.9%)
  • Not recorded12 (0.1%)

Vehicles involved

  • Car7,175 (46%)
  • Motorcycle2,797 (18%)
  • Pedal cycle1,896 (12%)
  • Bus or coach1,420 (9.1%)
  • Van or goods vehicle up to 3.5 tonnes979 (6.3%)
  • Taxi or private hire car923 (5.9%)
  • Other430 (2.8%)
  • Not recorded1 (under 0.1%)

Casualties by age

  • 0 to 5114 (1%)
  • 6 to 10151 (1.3%)
  • 11 to 15295 (2.6%)
  • 16 to 201,181 (10%)
  • 21 to 251,982 (17%)
  • 26 to 353,037 (27%)
  • 36 to 451,518 (13%)
  • 46 to 551,006 (8.9%)
  • 56 to 65589 (5.2%)
  • 66 to 75372 (3.3%)
  • Over 75225 (2%)
  • Not recorded873 (7.7%)

Drivers, passengers and pedestrians

  • Driver or rider5,359 (47%)
  • Pedestrian4,061 (36%)
  • Passenger1,923 (17%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A400

Map of the 25 most recent crashes on the A400

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

  • 25 crashes
  • Serious
  • Slight

A400 crashes by council area

Collisions on the A400 were recorded in 3 council areas. Camden has the most, with 7,255, followed by Westminster (1,789) and Islington (1,039).

Collisions on the A400 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCamden7,2558,206481,084
2ndWestminster1,7891,9708290
3rdIslington1,0391,1434163

A400 crashes by town

Collisions on the A400 were recorded in 3 towns and built-up areas, led by Camden (6,920) and City of Westminster (1,269).

Recent crashes on the A400

These are the 25 most recent collisions on the A400, from 19 October to 27 December 2025.

Severity