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CrashStats

CM21 road accidents: crash map and statistics

Police recorded 1,270 road traffic collisions in the CM21 postcode district, East Hertfordshire, from 1979 to 2025, and 1,797 people were killed or injured in them. Of those collisions, 20 were fatal and 264 were serious.

In 2025 police recorded 13 collisions, up from 11 in 2024.

Collisions since 1979
1,270
2,080th of 2,813 postcode districts, highest first
Casualties
1,797
1.41 per collision
Fatal collisions
20
22 people killed
Serious collisions
264
316 seriously injured
Collisions in 2025
13
11 in 2024
Casualties in 2025
18
18 in 2024

Road collision statistics for CM21

Collisions by severity, 1979 to 2025

  • Fatal201.6%
  • Serious26421%
  • Slight98678%

What the data shows

  • CM21 had 144 collisions from 2016 to 2025, 18% fewer than the 175 from 2006 to 2015.
  • 22% of collisions in CM21 were fatal or serious, against 20% across Great Britain.
  • 158 children under 16 were killed or injured in CM21, 8.9% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 40% of collisions in CM21.

Where CM21 ranks among 2,813 postcode districts

Most collisions
2,080th
Most casualties
2,070th
Most fatal collisions
2,159th
Most serious collisions
2,096th

Collisions by day of the week

  • Monday176 (14%)
  • Tuesday173 (14%)
  • Wednesday182 (14%)
  • Thursday178 (14%)
  • Friday213 (17%)
  • Saturday207 (16%)
  • Sunday141 (11%)

Light conditions

  • Daylight898 (71%)
  • Dark, street lights lit246 (19%)
  • Dark, no street lighting91 (7.2%)
  • Dark, lighting unknown23 (1.8%)
  • Dark, street lights unlit12 (0.9%)

Type of road

  • Single carriageway1,166 (92%)
  • Dual carriageway75 (5.9%)
  • Roundabout17 (1.3%)
  • One way street or slip road11 (0.9%)
  • Not recorded1 (0.1%)

Speed limit at the scene

  • 20 mph5 (0.4%)
  • 30 mph634 (50%)
  • 40 mph177 (14%)
  • 50 mph43 (3.4%)
  • 60 mph347 (27%)
  • 70 mph64 (5%)

Weather at the time

  • Fine, no high winds972 (77%)
  • Raining, no high winds181 (14%)
  • Fine with high winds17 (1.3%)
  • Raining with high winds16 (1.3%)
  • Fog or mist15 (1.2%)
  • Snowing, no high winds8 (0.6%)
  • Snowing with high winds1 (0.1%)
  • Other39 (3.1%)
  • Not recorded21 (1.7%)

Who was hurt

  • Car occupant1,228 (68%)
  • Motorcyclist202 (11%)
  • Pedestrian156 (8.7%)
  • Cyclist111 (6.2%)
  • Van occupant47 (2.6%)
  • Goods vehicle occupant (over 3.5 tonnes)20 (1.1%)
  • Taxi or private hire car occupant9 (0.5%)
  • Bus or coach occupant8 (0.4%)
  • Other vehicle occupant8 (0.4%)
  • Minibus occupant5 (0.3%)
  • Other3 (0.2%)

Source: Department for Transport, STATS19 road safety data

CM21 road accidents by year

Collisions and casualties in CM21, 1979 to 2025

Collisions in CM21 peaked at 47 in 1998; 2025 had 13.

  • Collisions
  • Collisions in 2025: 13
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251318
20241118
20231216
20221721
20211217
20201015
20192130
20181928
20171113
20161825
20151719
20142127
20131218
20121834
20111322
20101520
20092230
20081522
20071826
20062434
20052737
20043148
20033134
20023747
20013245
20004059
19993345
19984767
19973753
19964255
19954263
19943044
19933849
19924563
19912948
19904767
19892632
19884160
19873244
19863859
19854483
19843850
19833039
19823040
19812942
19803141
19792430

Map of recent crashes in CM21

Map of the 24 most recent crashes in CM21

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in CM21

The 24 most recent collisions in CM21 happened between 8 January 2024 and 12 December 2025.

Severity

Crashes by road in CM21

The A1184 has the most collisions in CM21, 616 of 1,270 (49%), followed by the M11 (57).

Collisions in CM21 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA11846168969118
2ndM115791010

Council areas covering CM21

Collisions in CM21 were recorded in 5 council areas. East Hertfordshire has 1,103 of 1,270 (87%).

Collisions in CM21 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stEast Hertfordshire1,1031,55418227
2ndEpping Forest123175129
3rdUttlesford365818
4thHarlow4400
5thHertsmere3400

Town in CM21

Of the 1,270 collisions in CM21, 771 (61%) were in Sawbridgeworth.