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CrashStats

WD23 road accidents: crash map and statistics

Police recorded 3,402 road traffic collisions in the WD23 postcode district, Hertsmere, from 1979 to 2025, and 4,454 people were killed or injured in them. Of those collisions, 34 were fatal and 543 were serious.

In 2025 police recorded 40 collisions, up 25% on 2024 (32).

Collisions since 1979
3,402
1,131st highest of 2,813 postcode districts
Casualties
4,454
1.31 per collision
Fatal collisions
34
38 people killed
Serious collisions
543
619 seriously injured
Collisions in 2025
40
Up 25% on 2024
Casualties in 2025
59
Up 34% on 2024

Road collision statistics for WD23

Collisions by severity, 1979 to 2025

  • Fatal341%
  • Serious54316%
  • Slight2,82583%

What the data shows

  • WD23 had 396 collisions from 2016 to 2025, 28% fewer than the 548 from 2006 to 2015.
  • 17% of collisions in WD23 were fatal or serious, against 20% across Great Britain.
  • 446 children under 16 were killed or injured in WD23, 10% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 36% of collisions in WD23.

Where WD23 ranks among 2,813 postcode districts

Most collisions
1,131st
Most casualties
1,166th
Most fatal collisions
1,719th
Most serious collisions
1,371st

Collisions by day of the week

  • Monday486 (14%)
  • Tuesday528 (16%)
  • Wednesday484 (14%)
  • Thursday550 (16%)
  • Friday554 (16%)
  • Saturday423 (12%)
  • Sunday377 (11%)

Light conditions

  • Daylight2,452 (72%)
  • Dark, street lights lit881 (26%)
  • Dark, lighting unknown28 (0.8%)
  • Dark, street lights unlit22 (0.6%)
  • Dark, no street lighting19 (0.6%)

Type of road

  • Single carriageway2,778 (82%)
  • Dual carriageway389 (11%)
  • Roundabout159 (4.7%)
  • One way street or slip road62 (1.8%)
  • Not recorded14 (0.4%)

Speed limit at the scene

  • 20 mph21 (0.6%)
  • 30 mph2,594 (76%)
  • 40 mph172 (5.1%)
  • 50 mph16 (0.5%)
  • 60 mph325 (9.6%)
  • 70 mph274 (8.1%)

Weather at the time

  • Fine, no high winds2,678 (79%)
  • Raining, no high winds533 (16%)
  • Fine with high winds37 (1.1%)
  • Raining with high winds32 (0.9%)
  • Snowing, no high winds21 (0.6%)
  • Fog or mist19 (0.6%)
  • Snowing with high winds3 (0.1%)
  • Other61 (1.8%)
  • Not recorded18 (0.5%)

Who was hurt

  • Car occupant2,845 (64%)
  • Motorcyclist514 (12%)
  • Pedestrian461 (10%)
  • Cyclist343 (7.7%)
  • Van occupant149 (3.3%)
  • Bus or coach occupant66 (1.5%)
  • Goods vehicle occupant (over 3.5 tonnes)21 (0.5%)
  • Minibus occupant20 (0.4%)
  • Taxi or private hire car occupant20 (0.4%)
  • Other vehicle occupant10 (0.2%)
  • Other2 (under 0.1%)
  • Not recorded3 (0.1%)

Source: Department for Transport, STATS19 road safety data

WD23 road accidents by year

Collisions and casualties in WD23, 1979 to 2025

Collisions in WD23 peaked at 163 in 1982; 2025 had 40.

  • Collisions
  • Collisions in 2025: 40
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20254059
20243244
20233037
20224867
20214150
20202731
20193541
20184670
20174656
20165160
20155683
20145468
20135165
20124362
20116178
20105986
20095064
20085266
20075463
20066885
20056295
20046481
200367108
200289120
200181109
200073121
199979103
199895129
19977492
199685106
199598118
1994105144
1993104123
1992114157
1991101132
1990133175
1989108136
1988129166
1987123161
1986114136
1985125153
1984147181
1983124168
1982163204
198100
198000
197911

Map of recent crashes in WD23

Map of the 24 most recent crashes in WD23

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in WD23

The 24 most recent collisions in WD23 happened between 10 June and 28 December 2025.

Severity

Crashes by road in WD23

The A411 has the most collisions in WD23, 720 of 3,402 (21%), followed by the A41 (366).

Collisions in WD23 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA4117209053134
2ndA41366551643
3rdA4008298406348
4thA4140261319235
5thM12494051046
6thB462215295033
7thA40985104210
8thA40883301

Council areas covering WD23

Collisions in WD23 were recorded in 6 council areas. Hertsmere has 3,191 of 3,402 (94%).

Collisions in WD23 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stHertsmere3,1914,19032511
2ndWatford9412208
3rdBarnet7089015
4thHarrow364124
5thNorth Hertfordshire4403
6thThree Rivers3301

Towns in WD23

Collisions in WD23 were recorded in 2 towns, led by Bushey (2,150) and Watford, Watford (43).