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CrashStats

AL4 road accidents: crash map and statistics

Police recorded 3,581 road traffic collisions in the AL4 postcode district, St Albans, from 1979 to 2025, and 5,078 people were killed or injured in them. Of those collisions, 73 were fatal and 709 were serious.

In 2025 police recorded 27 collisions, up 8% on 2024 (25).

Collisions since 1979
3,581
1,047th highest of 2,813 postcode districts
Casualties
5,078
1.42 per collision
Fatal collisions
73
78 people killed
Serious collisions
709
854 seriously injured
Collisions in 2025
27
Up 8% on 2024
Casualties in 2025
37
Up 3% on 2024

Road collision statistics for AL4

Collisions by severity, 1979 to 2025

  • Fatal732%
  • Serious70920%
  • Slight2,79978%

What the data shows

  • AL4 had 368 collisions from 2016 to 2025, 38% fewer than the 598 from 2006 to 2015.
  • 22% of collisions in AL4 were fatal or serious, against 20% across Great Britain.
  • 509 children under 16 were killed or injured in AL4, 10% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 42% of collisions in AL4.

Where AL4 ranks among 2,813 postcode districts

Most collisions
1,047th
Most casualties
974th
Most fatal collisions
622nd
Most serious collisions
938th

Collisions by day of the week

  • Monday494 (14%)
  • Tuesday552 (15%)
  • Wednesday542 (15%)
  • Thursday589 (16%)
  • Friday566 (16%)
  • Saturday474 (13%)
  • Sunday364 (10%)

Light conditions

  • Daylight2,536 (71%)
  • Dark, street lights lit655 (18%)
  • Dark, no street lighting330 (9.2%)
  • Dark, lighting unknown32 (0.9%)
  • Dark, street lights unlit28 (0.8%)

Type of road

  • Single carriageway2,694 (75%)
  • Dual carriageway439 (12%)
  • Roundabout380 (11%)
  • One way street or slip road59 (1.6%)
  • Not recorded9 (0.3%)

Speed limit at the scene

  • 20 mph13 (0.4%)
  • 30 mph1,380 (39%)
  • 40 mph542 (15%)
  • 50 mph161 (4.5%)
  • 60 mph999 (28%)
  • 70 mph486 (14%)

Weather at the time

  • Fine, no high winds2,814 (79%)
  • Raining, no high winds515 (14%)
  • Raining with high winds49 (1.4%)
  • Fine with high winds42 (1.2%)
  • Fog or mist38 (1.1%)
  • Snowing, no high winds21 (0.6%)
  • Snowing with high winds6 (0.2%)
  • Other71 (2%)
  • Not recorded25 (0.7%)

Who was hurt

  • Car occupant3,485 (69%)
  • Motorcyclist552 (11%)
  • Pedestrian360 (7.1%)
  • Cyclist344 (6.8%)
  • Van occupant131 (2.6%)
  • Bus or coach occupant75 (1.5%)
  • Goods vehicle occupant (over 3.5 tonnes)40 (0.8%)
  • Minibus occupant38 (0.7%)
  • Taxi or private hire car occupant31 (0.6%)
  • Other vehicle occupant11 (0.2%)
  • Other9 (0.2%)
  • Not recorded2 (under 0.1%)

Source: Department for Transport, STATS19 road safety data

AL4 road accidents by year

Collisions and casualties in AL4, 1979 to 2025

Collisions in AL4 peaked at 122 in 1979; 2025 had 27.

  • Collisions
  • Collisions in 2025: 27
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20252737
20242536
20232733
20223344
20213150
20202742
20194460
20184371
20174569
20166695
20155273
20144267
20134664
20124560
20115072
201064100
200972112
200880113
200778105
20066995
200593122
2004109156
2003105144
2002103151
200187140
2000115167
199998152
199899125
199796149
1996108150
199587131
199492117
199393134
199289121
1991101138
199092132
198973104
198879103
1987101124
198698142
1985102135
198498141
198388128
1982101149
198198139
198088119
1979122167

Map of recent crashes in AL4

Map of the 24 most recent crashes in AL4

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in AL4

The 24 most recent collisions in AL4 happened between 20 February and 19 December 2025.

Severity

Crashes by road in AL4

The A414 has the most collisions in AL4, 520 of 3,581 (15%), followed by the B651 (464).

Collisions in AL4 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA4145207421790
2ndB65146466111117
3rdA10573314941162
4thB653278455441
5thA100196141016
6thA1(M)84126114
7thA40577117727
8thA612972106329
9thB64266284017
10thA1264414
11thB556243419
12thB1977801
13thA10813510

Council areas covering AL4

Collisions in AL4 were recorded in 4 council areas. St Albans has 3,086 of 3,581 (86%).

Collisions in AL4 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stSt Albans3,0864,33559599
2ndWelwyn Hatfield4416641395
3rdHertsmere305018
4thNorth Hertfordshire212606

Towns in AL4

Collisions in AL4 were recorded in 5 towns, led by St Albans (855) and Wheathampstead (256).