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CrashStats

WD4 road accidents: crash map and statistics

Police recorded 3,014 road traffic collisions in the WD4 postcode district, Three Rivers, from 1979 to 2025, and 4,366 people were killed or injured in them. Of those collisions, 37 were fatal and 574 were serious.

In 2025 police recorded 36 collisions, up 57% on 2024 (23).

Collisions since 1979
3,014
1,315th highest of 2,813 postcode districts
Casualties
4,366
1.45 per collision
Fatal collisions
37
39 people killed
Serious collisions
574
679 seriously injured
Collisions in 2025
36
Up 57% on 2024
Casualties in 2025
52
Up 63% on 2024

Road collision statistics for WD4

Collisions by severity, 1979 to 2025

  • Fatal371.2%
  • Serious57419%
  • Slight2,40380%

What the data shows

  • WD4 had 334 collisions from 2016 to 2025, 37% fewer than the 527 from 2006 to 2015.
  • 20% of collisions in WD4 were fatal or serious, against 20% across Great Britain.
  • 396 children under 16 were killed or injured in WD4, 9.1% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 39% of collisions in WD4.

Where WD4 ranks among 2,813 postcode districts

Most collisions
1,315th
Most casualties
1,201st
Most fatal collisions
1,608th
Most serious collisions
1,284th

Collisions by day of the week

  • Monday396 (13%)
  • Tuesday437 (14%)
  • Wednesday486 (16%)
  • Thursday447 (15%)
  • Friday502 (17%)
  • Saturday372 (12%)
  • Sunday374 (12%)

Light conditions

  • Daylight2,212 (73%)
  • Dark, street lights lit569 (19%)
  • Dark, no street lighting185 (6.1%)
  • Dark, lighting unknown33 (1.1%)
  • Dark, street lights unlit15 (0.5%)

Type of road

  • Single carriageway1,643 (55%)
  • Dual carriageway1,038 (34%)
  • Roundabout219 (7.3%)
  • One way street or slip road109 (3.6%)
  • Not recorded5 (0.2%)

Speed limit at the scene

  • 20 mph9 (0.3%)
  • 30 mph1,195 (40%)
  • 40 mph158 (5.2%)
  • 50 mph105 (3.5%)
  • 60 mph459 (15%)
  • 70 mph1,088 (36%)

Weather at the time

  • Fine, no high winds2,347 (78%)
  • Raining, no high winds446 (15%)
  • Fine with high winds38 (1.3%)
  • Fog or mist31 (1%)
  • Raining with high winds21 (0.7%)
  • Snowing, no high winds15 (0.5%)
  • Snowing with high winds6 (0.2%)
  • Other68 (2.3%)
  • Not recorded42 (1.4%)

Who was hurt

  • Car occupant3,173 (73%)
  • Motorcyclist486 (11%)
  • Pedestrian218 (5%)
  • Van occupant160 (3.7%)
  • Cyclist152 (3.5%)
  • Goods vehicle occupant (over 3.5 tonnes)69 (1.6%)
  • Bus or coach occupant44 (1%)
  • Minibus occupant26 (0.6%)
  • Taxi or private hire car occupant25 (0.6%)
  • Other vehicle occupant8 (0.2%)
  • Other5 (0.1%)

Source: Department for Transport, STATS19 road safety data

WD4 road accidents by year

Collisions and casualties in WD4, 1979 to 2025

Collisions in WD4 peaked at 115 in 1999; 2025 had 36.

  • Collisions
  • Collisions in 2025: 36
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20253652
20242332
20232230
20223144
20213040
20201828
20193749
20184365
20174253
20165281
20154469
20143045
20133655
20124465
20115283
20105575
20094866
200865100
200780122
20067398
200582126
200479110
200372101
200276109
200186111
200089126
1999115162
1998100165
1997104144
199697136
1995107170
199471112
199371104
199276117
199169102
199085120
19897593
198871111
198780105
198674100
19856499
19846798
19836085
198266105
19816490
19807089
197983124

Map of recent crashes in WD4

Map of the 24 most recent crashes in WD4

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

  • 24 crashes
  • Fatal
  • Serious
  • Slight

Recent road crashes in WD4

The 24 most recent collisions in WD4 happened between 20 April and 29 December 2025.

Severity

Crashes by road in WD4

The A41 has the most collisions in WD4, 990 of 3,014 (33%), followed by the M25 (670).

Collisions in WD4 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA419901,50213195
2ndM25670985874
3rdA4251210316342
4thA405121703
5thB45053400

Council areas covering WD4

Collisions in WD4 were recorded in 4 council areas. Three Rivers has 1,681 of 3,014 (56%).

Collisions in WD4 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stThree Rivers1,6812,44919290
2ndDacorum1,3001,86917278
3rdWatford233613
4thSt Albans3300

Towns in WD4

Collisions in WD4 were recorded in 5 towns, led by Abbots Langley and Kings Langley (991) and Rucklers Lane (98).