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CrashStats

AL7 road accidents: crash map and statistics

Police recorded 3,283 road traffic collisions in the AL7 postcode district, Welwyn Hatfield, from 1979 to 2025, and 4,225 people were killed or injured in them. Of those collisions, 35 were fatal and 609 were serious.

In 2025 police recorded 23 collisions, down 30% on 2024 (33).

Collisions since 1979
3,283
1,195th highest of 2,813 postcode districts
Casualties
4,225
1.29 per collision
Fatal collisions
35
37 people killed
Serious collisions
609
693 seriously injured
Collisions in 2025
23
Down 30% on 2024
Casualties in 2025
27
Down 39% on 2024

Road collision statistics for AL7

Collisions by severity, 1979 to 2025

  • Fatal351.1%
  • Serious60919%
  • Slight2,63980%

What the data shows

  • AL7 had 357 collisions from 2016 to 2025, 35% fewer than the 549 from 2006 to 2015.
  • 20% of collisions in AL7 were fatal or serious, against 20% across Great Britain.
  • 609 children under 16 were killed or injured in AL7, 14% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 38% of collisions in AL7.

Where AL7 ranks among 2,813 postcode districts

Most collisions
1,195th
Most casualties
1,231st
Most fatal collisions
1,679th
Most serious collisions
1,181st

Collisions by day of the week

  • Monday477 (15%)
  • Tuesday499 (15%)
  • Wednesday494 (15%)
  • Thursday565 (17%)
  • Friday549 (17%)
  • Saturday384 (12%)
  • Sunday315 (9.6%)

Light conditions

  • Daylight2,368 (72%)
  • Dark, street lights lit767 (23%)
  • Dark, no street lighting67 (2%)
  • Dark, street lights unlit45 (1.4%)
  • Dark, lighting unknown36 (1.1%)

Type of road

  • Single carriageway2,728 (83%)
  • Roundabout371 (11%)
  • One way street or slip road102 (3.1%)
  • Dual carriageway70 (2.1%)
  • Not recorded12 (0.4%)

Speed limit at the scene

  • 20 mph13 (0.4%)
  • 30 mph2,407 (73%)
  • 40 mph541 (16%)
  • 50 mph7 (0.2%)
  • 60 mph295 (9%)
  • 70 mph20 (0.6%)

Weather at the time

  • Fine, no high winds2,616 (80%)
  • Raining, no high winds454 (14%)
  • Fine with high winds39 (1.2%)
  • Raining with high winds27 (0.8%)
  • Fog or mist24 (0.7%)
  • Snowing, no high winds22 (0.7%)
  • Snowing with high winds3 (0.1%)
  • Other58 (1.8%)
  • Not recorded40 (1.2%)

Who was hurt

  • Car occupant2,286 (54%)
  • Motorcyclist654 (15%)
  • Cyclist584 (14%)
  • Pedestrian540 (13%)
  • Van occupant67 (1.6%)
  • Bus or coach occupant33 (0.8%)
  • Taxi or private hire car occupant26 (0.6%)
  • Other vehicle occupant16 (0.4%)
  • Goods vehicle occupant (over 3.5 tonnes)9 (0.2%)
  • Minibus occupant5 (0.1%)
  • Other4 (0.1%)
  • Not recorded1 (under 0.1%)

Source: Department for Transport, STATS19 road safety data

AL7 road accidents by year

Collisions and casualties in AL7, 1979 to 2025

Collisions in AL7 peaked at 107 in 1997; 2025 had 23.

  • Collisions
  • Collisions in 2025: 23
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20252327
20243344
20233949
20224558
20211923
20202639
20193850
20183852
20173953
20165780
20155565
20145279
20134144
20125569
20114762
20104863
20094458
20085169
20077289
200684111
20057389
20046682
20037796
200283113
200187130
20007195
199992121
199879114
1997107142
199690131
199586107
199489114
199399125
199295115
19917285
1990100124
198999125
198886106
198784108
198691106
198592107
198495112
1983100119
198294117
198179101
198099127
197992130

Map of recent crashes in AL7

Map of the 24 most recent crashes in AL7

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in AL7

The 24 most recent collisions in AL7 happened between 18 November 2024 and 13 December 2025.

Severity

Crashes by road in AL7

The A1000 has the most collisions in AL7, 660 of 3,283 (20%), followed by the B195 (341).

Collisions in AL7 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA10006608394123
2ndB195341499263
3rdB1000155237229
4thA6129181805
5thA414173134

Council areas covering AL7

Collisions in AL7 were recorded in 2 council areas. Welwyn Hatfield has 3,225 of 3,283 (98%).

Collisions in AL7 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stWelwyn Hatfield3,2254,12834598
2ndEast Hertfordshire5693111

Town in AL7

Of the 3,283 collisions in AL7, 2,606 (79%) were in Welwyn Garden City.