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CrashStats

SG3 road accidents: crash map and statistics

Police recorded 1,005 road traffic collisions in the SG3 postcode district, North Hertfordshire, from 1979 to 2025, and 1,466 people were killed or injured in them. Of those collisions, 19 were fatal and 169 were serious.

In 2025 police recorded 9 collisions, down from 11 in 2024.

Collisions since 1979
1,005
2,201st of 2,813 postcode districts, highest first
Casualties
1,466
1.46 per collision
Fatal collisions
19
21 people killed
Serious collisions
169
204 seriously injured
Collisions in 2025
9
11 in 2024
Casualties in 2025
9
12 in 2024

Road collision statistics for SG3

Collisions by severity, 1979 to 2025

  • Fatal191.9%
  • Serious16917%
  • Slight81781%

What the data shows

  • SG3 had 125 collisions from 2016 to 2025, 41% fewer than the 211 from 2006 to 2015.
  • 19% of collisions in SG3 were fatal or serious, against 20% across Great Britain.
  • 120 children under 16 were killed or injured in SG3, 8.2% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 38% of collisions in SG3.

Where SG3 ranks among 2,813 postcode districts

Most collisions
2,201st
Most casualties
2,172nd
Most fatal collisions
2,186th
Most serious collisions
2,313th

Collisions by day of the week

  • Monday140 (14%)
  • Tuesday131 (13%)
  • Wednesday142 (14%)
  • Thursday157 (16%)
  • Friday172 (17%)
  • Saturday124 (12%)
  • Sunday139 (14%)

Light conditions

  • Daylight710 (71%)
  • Dark, no street lighting161 (16%)
  • Dark, street lights lit114 (11%)
  • Dark, lighting unknown14 (1.4%)
  • Dark, street lights unlit6 (0.6%)

Type of road

  • Single carriageway655 (65%)
  • Dual carriageway322 (32%)
  • Roundabout18 (1.8%)
  • One way street or slip road6 (0.6%)
  • Not recorded4 (0.4%)

Speed limit at the scene

  • 20 mph3 (0.3%)
  • 30 mph319 (32%)
  • 40 mph120 (12%)
  • 50 mph1 (0.1%)
  • 60 mph231 (23%)
  • 70 mph331 (33%)

Weather at the time

  • Fine, no high winds803 (80%)
  • Raining, no high winds115 (11%)
  • Fine with high winds20 (2%)
  • Fog or mist14 (1.4%)
  • Raining with high winds9 (0.9%)
  • Snowing, no high winds8 (0.8%)
  • Snowing with high winds6 (0.6%)
  • Other20 (2%)
  • Not recorded10 (1%)

Who was hurt

  • Car occupant1,043 (71%)
  • Motorcyclist159 (11%)
  • Pedestrian97 (6.6%)
  • Cyclist69 (4.7%)
  • Van occupant60 (4.1%)
  • Goods vehicle occupant (over 3.5 tonnes)16 (1.1%)
  • Minibus occupant8 (0.5%)
  • Other vehicle occupant6 (0.4%)
  • Bus or coach occupant4 (0.3%)
  • Taxi or private hire car occupant2 (0.1%)
  • Other2 (0.1%)

Source: Department for Transport, STATS19 road safety data

SG3 road accidents by year

Collisions and casualties in SG3, 1979 to 2025

Collisions in SG3 peaked at 32 in 2005; 2025 had 9.

  • Collisions
  • Collisions in 2025: 9
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202599
20241112
20231214
20221120
20211017
2020611
20191218
20181826
20171936
20161726
20152034
20142037
20132034
20123148
20111314
20102438
20091222
20081920
20072332
20062943
20053259
20042843
20033146
20022226
20012430
20002145
19992740
19983145
19972330
19962334
19952534
19943254
19931626
19921618
19912233
19902226
19892430
19883246
19872633
19862029
19851923
19842731
19831924
19823049
19812427
19802231
19793143

Map of recent crashes in SG3

Map of the 24 most recent crashes in SG3

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in SG3

The 24 most recent collisions in SG3 happened between 2 August 2023 and 1 December 2025.

Severity

Crashes by road in SG3

The B197 has the most collisions in SG3, 281 of 1,005 (28%), followed by the A1(M) (262).

Collisions in SG3 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stB197281384755
2ndA1(M)262436531
3rdA16110736

Council areas covering SG3

Collisions in SG3 were recorded in 4 council areas. North Hertfordshire has 642 of 1,005 (64%).

Collisions in SG3 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stNorth Hertfordshire6429221397
2ndWelwyn Hatfield158221334
3rdEast Hertfordshire128195226
4thStevenage77128112

Towns in SG3

Collisions in SG3 were recorded in 3 towns, led by Knebworth (226) and Woolmer Green (111).