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CrashStats

A4008 accidents: crash map and statistics

Police recorded 1,317 collisions on the A4008 from 1979 to 2025, with 1,865 casualties. Of those crashes, 22 were fatal and 230 serious, and 25 people were killed.

In 2025 there were 19 collisions on the A4008, up 90% from 10 in 2024, with 25 casualties.

Live A4008 closures, incidents and roadworks are checked every 5 minutes.

Collisions since 1979
1,317
842nd highest of 4,923 roads
Casualties
1,865
1.42 per collision
Fatal collisions
22
25 people killed
Serious collisions
230
280 seriously injured
Collisions in 2025
19
Up 90% on 2024
Casualties in 2025
25
Up 92% on 2024

Crash severity on the A4008

On the A4008, 1.7% of collisions were fatal and 17% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal221.7%
  • Serious23017%
  • Slight1,06581%

Where the A4008 ranks among 4,923 roads

Most collisions
842nd
Most casualties
803rd
Most fatal collisions
902nd
Most serious collisions
933rd

A4008 accidents by year

Collisions on the A4008 peaked at 56 in 1980 and were down to 19 in 2025.

Collisions and casualties on the A4008, 1979 to 2025

  • Collisions
  • Collisions in 2025: 19
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251925
20241013
20231823
20221727
20211517
20201213
2019913
20181526
20171317
20161524
20152229
20142134
20131625
20122033
20111827
20102835
20091730
20081523
20071420
20062235
20052027
20042231
20032231
20023853
20013956
20003041
19994165
19982647
19973037
19964258
19953249
19942949
19933965
19924271
19913141
19904257
19894055
19884351
19873548
19863542
19853753
19844454
19834054
19823948
19814158
19805674
19794661

When crashes happen on the A4008

Friday has the most collisions on the A4008 (224), and 3pm to 6pm is the busiest time of day (282).

Collisions by day of the week

  • Monday160 (12%)
  • Tuesday185 (14%)
  • Wednesday204 (15%)
  • Thursday194 (15%)
  • Friday224 (17%)
  • Saturday193 (15%)
  • Sunday157 (12%)

Collisions by time of day

  • Midnight to 3am51 (3.9%)
  • 3am to 6am32 (2.4%)
  • 6am to 9am190 (14%)
  • 9am to noon178 (14%)
  • Noon to 3pm234 (18%)
  • 3pm to 6pm282 (21%)
  • 6pm to 9pm227 (17%)
  • 9pm to midnight123 (9.3%)

Collisions by month

  • January124 (9.4%)
  • February87 (6.6%)
  • March111 (8.4%)
  • April122 (9.3%)
  • May112 (8.5%)
  • June119 (9%)
  • July91 (6.9%)
  • August98 (7.4%)
  • September114 (8.7%)
  • October103 (7.8%)
  • November120 (9.1%)
  • December116 (8.8%)

Light conditions at the time

  • Daylight924 (70%)
  • Dark, street lights lit371 (28%)
  • Dark, lighting unknown13 (1%)
  • Dark, street lights unlit5 (0.4%)
  • Dark, no street lighting4 (0.3%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4008 crashes

On the A4008, 52% of collisions happened where the speed limit was 30 mph and 63% on a dry road surface.

Speed limit at the scene

  • 20 mph2 (0.2%)
  • 30 mph685 (52%)
  • 40 mph374 (28%)
  • 50 mph17 (1.3%)
  • 60 mph189 (14%)
  • 70 mph50 (3.8%)

Weather at the time

  • Fine, no high winds943 (72%)
  • Raining, no high winds209 (16%)
  • Raining with high winds17 (1.3%)
  • Fog or mist14 (1.1%)
  • Other115 (8.7%)
  • Not recorded19 (1.4%)

Road surface

  • Dry832 (63%)
  • Wet or damp443 (34%)
  • Frost or ice25 (1.9%)
  • Snow9 (0.7%)
  • Flood over 3cm deep2 (0.2%)
  • Not recorded6 (0.5%)

Type of road

  • Single carriageway786 (60%)
  • Dual carriageway205 (16%)
  • Roundabout202 (15%)
  • One way street or slip road64 (4.9%)
  • Not recorded60 (4.6%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4008 crashes

Car occupants make up 71% of the people killed or injured on the A4008, followed by motorcyclists (12%).

Casualties by road user

  • Car occupant1,333 (71%)
  • Motorcyclist231 (12%)
  • Cyclist98 (5.3%)
  • Pedestrian87 (4.7%)
  • Van occupant62 (3.3%)
  • Goods vehicle occupant (over 3.5 tonnes)17 (0.9%)
  • Bus or coach occupant14 (0.8%)
  • Other23 (1.2%)

Vehicles involved

  • Car2,040 (78%)
  • Motorcycle225 (8.6%)
  • Van or goods vehicle up to 3.5 tonnes149 (5.7%)
  • Pedal cycle99 (3.8%)
  • Goods vehicle over 3.5 tonnes52 (2%)
  • Bus or coach26 (1%)
  • Other32 (1.2%)
  • Not recorded1 (under 0.1%)

Casualties by age

  • 0 to 534 (1.8%)
  • 6 to 1034 (1.8%)
  • 11 to 1576 (4.1%)
  • 16 to 20323 (17%)
  • 21 to 25310 (17%)
  • 26 to 35400 (21%)
  • 36 to 45226 (12%)
  • 46 to 55182 (9.8%)
  • 56 to 65121 (6.5%)
  • 66 to 7569 (3.7%)
  • Over 7537 (2%)
  • Not recorded53 (2.8%)

Drivers, passengers and pedestrians

  • Driver or rider1,270 (68%)
  • Passenger508 (27%)
  • Pedestrian87 (4.7%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4008

Map of the 25 most recent crashes on the A4008

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

  • 25 crashes
  • Serious
  • Slight

A4008 crashes by council area

Collisions on the A4008 were recorded in 6 council areas. Hertsmere has the most, with 518, followed by Watford (290) and Three Rivers (252).

Collisions on the A4008 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stHertsmere518716576
2ndWatford290401651
3rdThree Rivers252388365
4thHarrow240340836
5thBrent81102
6thBarnet7700

A4008 crashes by town

Collisions on the A4008 were recorded in 3 towns and built-up areas, led by Watford, Watford (329) and Bushey (155).

Recent crashes on the A4008

These are the 25 most recent collisions on the A4008, from 4 May 2024 to 6 December 2025.

Severity