Skip to main content
CrashStats

A4125 accidents: crash map and statistics

Police recorded 939 collisions on the A4125 from 1979 to 2025, with 1,398 casualties. Of those crashes, 8 were fatal and 182 serious, and 8 people were killed.

In 2025 there were 5 collisions on the A4125, down 38% from 8 in 2024, with 7 casualties.

Collisions since 1979
939
1,154th highest of 4,923 roads
Casualties
1,398
1.49 per collision
Fatal collisions
8
8 people killed
Serious collisions
182
230 seriously injured
Collisions in 2025
5
Down 38% on 2024
Casualties in 2025
7
Down 22% on 2024

Crash severity on the A4125

On the A4125, 0.9% of collisions were fatal and 19% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal80.9%
  • Serious18219%
  • Slight74980%

Where the A4125 ranks among 4,923 roads

Most collisions
1,154th
Most casualties
1,058th
Most fatal collisions
1,937th
Most serious collisions
1,155th

A4125 accidents by year

Collisions on the A4125 peaked at 41 in 1996 and were down to 5 in 2025.

Collisions and casualties on the A4125, 1979 to 2025

  • Collisions
  • Collisions in 2025: 5
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202557
202489
20231416
202279
20211012
20201013
201966
2018711
20171519
20161419
20151421
20141424
20131111
20121419
20111523
20102128
20091630
20081620
20071825
20061930
20051420
20041925
20031930
20023549
20013653
20003456
19992641
19982943
19973149
19964179
19953454
19943660
19931823
19922032
19912232
19901318
19891522
19881423
19871724
19862837
19853452
19843553
19832024
19822135
19811927
19802641
19792944

When crashes happen on the A4125

Friday has the most collisions on the A4125 (153), and 3pm to 6pm is the busiest time of day (226).

Collisions by day of the week

  • Monday137 (15%)
  • Tuesday129 (14%)
  • Wednesday150 (16%)
  • Thursday125 (13%)
  • Friday153 (16%)
  • Saturday132 (14%)
  • Sunday113 (12%)

Collisions by time of day

  • Midnight to 3am34 (3.6%)
  • 3am to 6am13 (1.4%)
  • 6am to 9am155 (17%)
  • 9am to noon141 (15%)
  • Noon to 3pm159 (17%)
  • 3pm to 6pm226 (24%)
  • 6pm to 9pm137 (15%)
  • 9pm to midnight74 (7.9%)

Collisions by month

  • January97 (10%)
  • February78 (8.3%)
  • March69 (7.3%)
  • April61 (6.5%)
  • May70 (7.5%)
  • June75 (8%)
  • July66 (7%)
  • August76 (8.1%)
  • September82 (8.7%)
  • October90 (9.6%)
  • November96 (10%)
  • December79 (8.4%)

Light conditions at the time

  • Daylight674 (72%)
  • Dark, street lights lit249 (27%)
  • Dark, lighting unknown8 (0.9%)
  • Dark, street lights unlit8 (0.9%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4125 crashes

On the A4125, 70% of collisions happened where the speed limit was 30 mph and 57% on a dry road surface.

Speed limit at the scene

  • 20 mph2 (0.2%)
  • 30 mph656 (70%)
  • 40 mph277 (29%)
  • 50 mph1 (0.1%)
  • 60 mph2 (0.2%)
  • 70 mph1 (0.1%)

Weather at the time

  • Fine, no high winds713 (76%)
  • Raining, no high winds158 (17%)
  • Fine with high winds12 (1.3%)
  • Raining with high winds12 (1.3%)
  • Other30 (3.2%)
  • Not recorded14 (1.5%)

Road surface

  • Dry535 (57%)
  • Wet or damp373 (40%)
  • Frost or ice22 (2.3%)
  • Snow5 (0.5%)
  • Flood over 3cm deep1 (0.1%)
  • Not recorded3 (0.3%)

Type of road

  • Single carriageway896 (95%)
  • Roundabout22 (2.3%)
  • Dual carriageway14 (1.5%)
  • One way street or slip road3 (0.3%)
  • Not recorded4 (0.4%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4125 crashes

Car occupants make up 74% of the people killed or injured on the A4125, followed by motorcyclists (10%).

Casualties by road user

  • Car occupant1,034 (74%)
  • Motorcyclist144 (10%)
  • Pedestrian78 (5.6%)
  • Cyclist64 (4.6%)
  • Van occupant34 (2.4%)
  • Bus or coach occupant18 (1.3%)
  • Goods vehicle occupant (over 3.5 tonnes)11 (0.8%)
  • Other15 (1.1%)

Vehicles involved

  • Car1,459 (80%)
  • Motorcycle148 (8.1%)
  • Van or goods vehicle up to 3.5 tonnes79 (4.3%)
  • Pedal cycle65 (3.5%)
  • Goods vehicle over 3.5 tonnes33 (1.8%)
  • Bus or coach23 (1.3%)
  • Taxi or private hire car14 (0.8%)
  • Other12 (0.7%)

Casualties by age

  • 0 to 534 (2.4%)
  • 6 to 1039 (2.8%)
  • 11 to 1566 (4.7%)
  • 16 to 20245 (18%)
  • 21 to 25199 (14%)
  • 26 to 35267 (19%)
  • 36 to 45214 (15%)
  • 46 to 55142 (10%)
  • 56 to 6583 (5.9%)
  • 66 to 7557 (4.1%)
  • Over 7536 (2.6%)
  • Not recorded16 (1.1%)

Drivers, passengers and pedestrians

  • Driver or rider931 (67%)
  • Passenger389 (28%)
  • Pedestrian78 (5.6%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4125

Map of the 25 most recent crashes on the A4125

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

A4125 crashes by council area

Collisions on the A4125 were recorded in 4 council areas. Three Rivers has the most, with 513, followed by Watford (315) and Hillingdon (105).

Collisions on the A4125 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stThree Rivers5137967109
2ndWatford315461159
3rdHillingdon105132013
4thDacorum4701

A4125 crashes by town

Collisions on the A4125 were recorded in 4 towns and built-up areas, led by Watford, Watford (350) and Eastbury, Three Rivers (116).

Recent crashes on the A4125

These are the 25 most recent collisions on the A4125, from 27 April 2023 to 31 August 2025.

Severity