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CrashStats

A412 accidents: crash map and statistics

Police recorded 5,907 collisions on the A412 from 1979 to 2025, with 7,788 casualties. Of those crashes, 90 were fatal and 1,139 serious, and 93 people were killed.

In 2025 there were 48 collisions on the A412, down 4% from 50 in 2024, with 65 casualties.

Live A412 closures, incidents and roadworks are checked every 5 minutes.

Collisions since 1979
5,907
162nd highest of 4,923 roads
Casualties
7,788
1.32 per collision
Fatal collisions
90
93 people killed
Serious collisions
1,139
1,306 seriously injured
Collisions in 2025
48
Down 4% on 2024
Casualties in 2025
65
Up 12% on 2024

Crash severity on the A412

On the A412, 1.5% of collisions were fatal and 19% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal901.5%
  • Serious1,13919%
  • Slight4,67879%

Where the A412 ranks among 4,923 roads

Most collisions
162nd
Most casualties
175th
Most fatal collisions
240th
Most serious collisions
160th

A412 accidents by year

Collisions on the A412 peaked at 214 in 1984 and were down to 48 in 2025.

Collisions and casualties on the A412, 1979 to 2025

  • Collisions
  • Collisions in 2025: 48
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20254865
20245058
20235668
20225065
20215160
20204351
20194364
20183948
20177085
20166582
201579100
201486116
20137191
20127795
201181100
201093127
200996128
200896135
200783123
2006116146
2005124176
2004117149
2003135180
2002142184
2001160227
2000146213
1999181242
1998193268
1997177259
1996190278
1995168248
1994162223
1993157208
1992130175
1991139180
1990166210
1989195243
1988186231
1987164213
1986159200
1985180225
1984214273
1983198249
1982184239
1981180218
1980156212
1979211258

When crashes happen on the A412

Friday has the most collisions on the A412 (1,026), and 3pm to 6pm is the busiest time of day (1,389).

Collisions by day of the week

  • Monday806 (14%)
  • Tuesday865 (15%)
  • Wednesday877 (15%)
  • Thursday956 (16%)
  • Friday1,026 (17%)
  • Saturday778 (13%)
  • Sunday599 (10%)

Collisions by time of day

  • Midnight to 3am214 (3.6%)
  • 3am to 6am99 (1.7%)
  • 6am to 9am819 (14%)
  • 9am to noon784 (13%)
  • Noon to 3pm995 (17%)
  • 3pm to 6pm1,389 (24%)
  • 6pm to 9pm994 (17%)
  • 9pm to midnight613 (10%)

Collisions by month

  • January466 (7.9%)
  • February439 (7.4%)
  • March480 (8.1%)
  • April444 (7.5%)
  • May479 (8.1%)
  • June517 (8.8%)
  • July492 (8.3%)
  • August445 (7.5%)
  • September522 (8.8%)
  • October548 (9.3%)
  • November557 (9.4%)
  • December518 (8.8%)

Light conditions at the time

  • Daylight4,093 (69%)
  • Dark, street lights lit1,640 (28%)
  • Dark, lighting unknown68 (1.2%)
  • Dark, no street lighting67 (1.1%)
  • Dark, street lights unlit36 (0.6%)
  • Not recorded3 (0.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A412 crashes

On the A412, 69% of collisions happened where the speed limit was 30 mph and 65% on a dry road surface.

Speed limit at the scene

  • 20 mph7 (0.1%)
  • 30 mph4,070 (69%)
  • 40 mph797 (13%)
  • 50 mph162 (2.7%)
  • 60 mph509 (8.6%)
  • 70 mph361 (6.1%)
  • Not recorded1 (under 0.1%)

Weather at the time

  • Fine, no high winds4,685 (79%)
  • Raining, no high winds850 (14%)
  • Fine with high winds54 (0.9%)
  • Raining with high winds49 (0.8%)
  • Other193 (3.3%)
  • Not recorded76 (1.3%)

Road surface

  • Dry3,828 (65%)
  • Wet or damp1,959 (33%)
  • Frost or ice74 (1.3%)
  • Snow18 (0.3%)
  • Other8 (0.1%)
  • Not recorded20 (0.3%)

Type of road

  • Single carriageway3,570 (60%)
  • Dual carriageway1,754 (30%)
  • Roundabout506 (8.6%)
  • One way street or slip road60 (1%)
  • Not recorded17 (0.3%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A412 crashes

Car occupants make up 59% of the people killed or injured on the A412, followed by motorcyclists (14%).

Casualties by road user

  • Car occupant4,615 (59%)
  • Motorcyclist1,067 (14%)
  • Pedestrian871 (11%)
  • Cyclist768 (9.9%)
  • Van occupant170 (2.2%)
  • Bus or coach occupant118 (1.5%)
  • Other177 (2.3%)
  • Not recorded2 (under 0.1%)

Vehicles involved

  • Car8,290 (72%)
  • Motorcycle1,116 (9.7%)
  • Pedal cycle781 (6.8%)
  • Van or goods vehicle up to 3.5 tonnes502 (4.4%)
  • Goods vehicle over 3.5 tonnes414 (3.6%)
  • Bus or coach172 (1.5%)
  • Other210 (1.8%)
  • Not recorded13 (0.1%)

Casualties by age

  • 0 to 5121 (1.6%)
  • 6 to 10187 (2.4%)
  • 11 to 15392 (5%)
  • 16 to 201,466 (19%)
  • 21 to 251,191 (15%)
  • 26 to 351,652 (21%)
  • 36 to 451,065 (14%)
  • 46 to 55686 (8.8%)
  • 56 to 65490 (6.3%)
  • 66 to 75288 (3.7%)
  • Over 75184 (2.4%)
  • Not recorded66 (0.8%)

Drivers, passengers and pedestrians

  • Driver or rider5,176 (66%)
  • Passenger1,741 (22%)
  • Pedestrian871 (11%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A412

Map of the 25 most recent crashes on the A412

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

  • 25 crashes
  • Serious
  • Slight

A412 crashes by council area

Collisions on the A412 were recorded in 6 council areas. Watford has the most, with 2,591, followed by Three Rivers (1,529) and Buckinghamshire (1,226).

Collisions on the A412 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stWatford2,5913,30220473
2ndThree Rivers1,5292,04017319
3rdBuckinghamshire1,2261,70842263
4thSlough5296971072
5thSt Albans182519
6thKensington and Chelsea6701

A412 crashes by town

Collisions on the A412 were recorded in 10 towns and built-up areas, led by Watford, Watford (2,536) and Rickmansworth (1,028).

Recent crashes on the A412

These are the 25 most recent collisions on the A412, from 12 July to 21 December 2025.

Severity