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CrashStats

AL9 road accidents: crash map and statistics

Police recorded 3,308 road traffic collisions in the AL9 postcode district, Welwyn Hatfield, from 1979 to 2025, and 4,773 people were killed or injured in them. Of those collisions, 63 were fatal and 618 were serious.

In 2025 police recorded 25 collisions, down 34% on 2024 (38).

Collisions since 1979
3,308
1,185th highest of 2,813 postcode districts
Casualties
4,773
1.44 per collision
Fatal collisions
63
71 people killed
Serious collisions
618
764 seriously injured
Collisions in 2025
25
Down 34% on 2024
Casualties in 2025
39
Down 39% on 2024

Road collision statistics for AL9

Collisions by severity, 1979 to 2025

  • Fatal631.9%
  • Serious61819%
  • Slight2,62779%

What the data shows

  • AL9 had 420 collisions from 2016 to 2025, 33% fewer than the 631 from 2006 to 2015.
  • 21% of collisions in AL9 were fatal or serious, against 20% across Great Britain.
  • 276 children under 16 were killed or injured in AL9, 5.8% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 40% of collisions in AL9.

Where AL9 ranks among 2,813 postcode districts

Most collisions
1,185th
Most casualties
1,065th
Most fatal collisions
855th
Most serious collisions
1,154th

Collisions by day of the week

  • Monday463 (14%)
  • Tuesday523 (16%)
  • Wednesday522 (16%)
  • Thursday462 (14%)
  • Friday534 (16%)
  • Saturday414 (13%)
  • Sunday390 (12%)

Light conditions

  • Daylight2,371 (72%)
  • Dark, street lights lit545 (16%)
  • Dark, no street lighting343 (10%)
  • Dark, lighting unknown40 (1.2%)
  • Dark, street lights unlit9 (0.3%)

Type of road

  • Single carriageway2,201 (67%)
  • Dual carriageway674 (20%)
  • Roundabout283 (8.6%)
  • One way street or slip road142 (4.3%)
  • Not recorded8 (0.2%)

Speed limit at the scene

  • 20 mph9 (0.3%)
  • 30 mph524 (16%)
  • 40 mph226 (6.8%)
  • 50 mph286 (8.6%)
  • 60 mph1,457 (44%)
  • 70 mph806 (24%)

Weather at the time

  • Fine, no high winds2,593 (78%)
  • Raining, no high winds465 (14%)
  • Fine with high winds48 (1.5%)
  • Fog or mist46 (1.4%)
  • Raining with high winds39 (1.2%)
  • Snowing, no high winds22 (0.7%)
  • Snowing with high winds4 (0.1%)
  • Other62 (1.9%)
  • Not recorded29 (0.9%)

Who was hurt

  • Car occupant3,634 (76%)
  • Motorcyclist469 (9.8%)
  • Cyclist209 (4.4%)
  • Van occupant178 (3.7%)
  • Pedestrian146 (3.1%)
  • Goods vehicle occupant (over 3.5 tonnes)61 (1.3%)
  • Taxi or private hire car occupant25 (0.5%)
  • Other vehicle occupant19 (0.4%)
  • Minibus occupant13 (0.3%)
  • Bus or coach occupant12 (0.3%)
  • Other6 (0.1%)
  • Not recorded1 (under 0.1%)

Source: Department for Transport, STATS19 road safety data

AL9 road accidents by year

Collisions and casualties in AL9, 1979 to 2025

Collisions in AL9 peaked at 122 in 1997; 2025 had 25.

  • Collisions
  • Collisions in 2025: 25
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20252539
20243864
20233952
20223860
20213850
20203243
20193759
20185070
20174974
201674105
20154780
201475112
20134564
20125075
20114668
20105774
20095977
200873103
200794133
200685114
200590127
2004106147
200388129
200298130
2001104147
2000100154
1999108162
1998110177
1997122173
199692127
199595136
199473103
19936899
199277113
199174121
199087137
198977101
198869112
19875885
198686117
198575100
19845985
19835874
19826895
19816583
19806490
197986133

Map of recent crashes in AL9

Map of the 24 most recent crashes in AL9

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in AL9

The 24 most recent collisions in AL9 happened between 18 February and 15 December 2025.

Severity

Crashes by road in AL9

The A1000 has the most collisions in AL9, 971 of 3,308 (29%), followed by the A414 (594).

Collisions in AL9 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA10009711,44727187
2ndA4145947901091
3rdA1(M)3074401145
4thB158247355364
5thA178107110
6thA10016913117
7thA6129638717
8thB157426329
9thB197253616

Council areas covering AL9

Collisions in AL9 were recorded in 6 council areas. Welwyn Hatfield has 3,223 of 3,308 (97%).

Collisions in AL9 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stWelwyn Hatfield3,2234,64063600
2ndHertsmere4871010
3rdEast Hertfordshire203906
4thNorth Hertfordshire6701
5thHavering4400
6thBroxbourne3700

Towns in AL9

Collisions in AL9 were recorded in 3 towns, led by Brookmans Park (407) and Hatfield (297).