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CrashStats

A406 accidents: crash map and statistics

Police recorded 23,966 collisions on the A406 from 1979 to 2025, with 32,200 casualties. Of those crashes, 333 were fatal and 2,984 serious, and 356 people were killed.

In 2025 there were 385 collisions on the A406, down 3% from 395 in 2024, with 482 casualties.

Collisions since 1979
23,966
24th highest of 4,923 roads
Casualties
32,200
1.34 per collision
Fatal collisions
333
356 people killed
Serious collisions
2,984
3,426 seriously injured
Collisions in 2025
385
Down 3% on 2024
Casualties in 2025
482
Down 8% on 2024

Crash severity on the A406

On the A406, 1.4% of collisions were fatal and 12% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal3331.4%
  • Serious2,98412%
  • Slight20,64986%

Where the A406 ranks among 4,923 roads

Most collisions
24th
Most casualties
26th
Most fatal collisions
47th
Most serious collisions
42nd

A406 accidents by year

Collisions on the A406 peaked at 665 in 2002 and were down to 385 in 2025.

Collisions and casualties on the A406, 1979 to 2025

  • Collisions
  • Collisions in 2025: 385
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
2025385482
2024395525
2023385497
2022421571
2021447622
2020382511
2019439584
2018422590
2017489679
2016408576
2015420572
2014455649
2013418569
2012428604
2011423566
2010453637
2009373511
2008358489
2007417555
2006444590
2005493660
2004447599
2003547759
2002665918
2001622869
2000643877
1999581813
1998588796
1997529686
1996585769
1995549741
1994585801
1993591786
1992589803
1991606779
1990630816
1989618773
1988561743
1987504660
1986613801
1985619825
1984577741
1983600787
1982577750
1981542760
1980557713
1979586796

When crashes happen on the A406

Friday has the most collisions on the A406 (3,675), and 3pm to 6pm is the busiest time of day (4,838).

Collisions by day of the week

  • Monday3,395 (14%)
  • Tuesday3,356 (14%)
  • Wednesday3,432 (14%)
  • Thursday3,355 (14%)
  • Friday3,675 (15%)
  • Saturday3,525 (15%)
  • Sunday3,228 (13%)

Collisions by time of day

  • Midnight to 3am1,299 (5.4%)
  • 3am to 6am719 (3%)
  • 6am to 9am2,931 (12%)
  • 9am to noon3,234 (13%)
  • Noon to 3pm4,050 (17%)
  • 3pm to 6pm4,838 (20%)
  • 6pm to 9pm4,114 (17%)
  • 9pm to midnight2,781 (12%)

Collisions by month

  • January1,886 (7.9%)
  • February1,753 (7.3%)
  • March1,939 (8.1%)
  • April1,822 (7.6%)
  • May1,985 (8.3%)
  • June2,005 (8.4%)
  • July2,070 (8.6%)
  • August1,966 (8.2%)
  • September2,113 (8.8%)
  • October2,161 (9%)
  • November2,151 (9%)
  • December2,115 (8.8%)

Light conditions at the time

  • Daylight15,718 (66%)
  • Dark, street lights lit7,952 (33%)
  • Dark, lighting unknown198 (0.8%)
  • Dark, street lights unlit78 (0.3%)
  • Dark, no street lighting20 (0.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A406 crashes

On the A406, 39% of collisions happened where the speed limit was 40 mph and 74% on a dry road surface.

Speed limit at the scene

  • 20 mph139 (0.6%)
  • 30 mph8,963 (37%)
  • 40 mph9,250 (39%)
  • 50 mph5,198 (22%)
  • 60 mph169 (0.7%)
  • 70 mph247 (1%)

Weather at the time

  • Fine, no high winds18,276 (76%)
  • Raining, no high winds3,244 (14%)
  • Fine with high winds184 (0.8%)
  • Raining with high winds158 (0.7%)
  • Other1,770 (7.4%)
  • Not recorded334 (1.4%)

Road surface

  • Dry17,649 (74%)
  • Wet or damp5,858 (24%)
  • Frost or ice160 (0.7%)
  • Snow76 (0.3%)
  • Other46 (0.2%)
  • Not recorded177 (0.7%)

Type of road

  • Dual carriageway14,653 (61%)
  • Single carriageway5,706 (24%)
  • Roundabout1,904 (7.9%)
  • One way street or slip road1,199 (5%)
  • Not recorded504 (2.1%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A406 crashes

Car occupants make up 72% of the people killed or injured on the A406, followed by motorcyclists (12%).

Casualties by road user

  • Car occupant23,152 (72%)
  • Motorcyclist3,792 (12%)
  • Pedestrian1,855 (5.8%)
  • Van occupant1,374 (4.3%)
  • Cyclist720 (2.2%)
  • Bus or coach occupant455 (1.4%)
  • Other848 (2.6%)
  • Not recorded4 (under 0.1%)

Vehicles involved

  • Car36,947 (76%)
  • Motorcycle3,850 (7.9%)
  • Van or goods vehicle up to 3.5 tonnes3,440 (7%)
  • Goods vehicle over 3.5 tonnes2,515 (5.1%)
  • Pedal cycle729 (1.5%)
  • Bus or coach588 (1.2%)
  • Other838 (1.7%)
  • Not recorded4 (under 0.1%)

Casualties by age

  • 0 to 5416 (1.3%)
  • 6 to 10532 (1.7%)
  • 11 to 15725 (2.3%)
  • 16 to 202,997 (9.3%)
  • 21 to 255,141 (16%)
  • 26 to 358,705 (27%)
  • 36 to 455,448 (17%)
  • 46 to 553,369 (10%)
  • 56 to 651,792 (5.6%)
  • 66 to 75761 (2.4%)
  • Over 75356 (1.1%)
  • Not recorded1,958 (6.1%)

Drivers, passengers and pedestrians

  • Driver or rider21,176 (66%)
  • Passenger9,169 (28%)
  • Pedestrian1,855 (5.8%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A406

Map of the 25 most recent crashes on the A406

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

A406 crashes by council area

Collisions on the A406 were recorded in 9 council areas. Enfield has the most, with 5,441, followed by Barnet (4,836) and Ealing (3,414).

Collisions on the A406 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stEnfield5,4417,19787688
2ndBarnet4,8366,49875576
3rdEaling3,4144,36540435
4thBrent3,3124,38556472
5thRedbridge2,7103,78531289
6thWaltham Forest2,1012,96129258
7thNewham1,3461,9215155
8thHounslow5617421082
9thBarking and Dagenham230318026

A406 crashes by town

Collisions on the A406 were recorded in 9 towns and built-up areas, led by Enfield (4,522) and Barnet (3,056).

Recent crashes on the A406

These are the 25 most recent collisions on the A406, from 5 December to 31 December 2025.

Severity