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CrashStats

Hertsmere road accidents in 2021: crash map and statistics

Police recorded 215 road traffic collisions in Hertsmere in 2021, and 295 people were killed or injured in them. Of those collisions, 4 were fatal and 34 were serious.

Collisions were up 14% on 2020 (189), and casualties rose from 278.

Across all years from 1979 to 2025, police recorded 20,104 collisions in Hertsmere.

Collisions in 2021
215
Up 14% on 2020
Casualties in 2021
295
Up 6% on 2020
Fatal collisions
4
1.9% of collisions
Serious collisions
34
16% of collisions

Crash severity in Hertsmere in 2021

1.9% of collisions in Hertsmere in 2021 were fatal and 16% serious, against 1.4% and 16% in Hertsmere from 1979 to 2025.

Collisions by worst injury

  • Fatal41.9%
  • Serious3416%
  • Slight17782%

People hurt, by injury

  • Fatal41.4%
  • Serious3713%
  • Slight25486%

Hertsmere road accidents by year

Collisions and casualties in Hertsmere, 1979 to 2025

Collisions peaked at 646 in 1979. 2021 is highlighted, with 215, up 14% on 2020.

  • Collisions
  • Collisions in 2021: 215
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
2025223317
2024249349
2023234316
2022263381
2021215295
2020189278
2019231298
2018272394
2017308422
2016349517
2015364510
2014337577
2013308438
2012310449
2011342487
2010355509
2009348494
2008340484
2007396619
2006429621
2005429622
2004468681
2003459700
2002505778
2001499771
2000506747
1999539719
1998502684
1997531703
1996520656
1995568750
1994502645
1993480661
1992497688
1991479644
1990586777
1989569731
1988510690
1987540716
1986544683
1985528671
1984565717
1983452586
1982496668
1981540711
1980582799
1979646903

When and where crashes happen in Hertsmere in 2021

Collisions by day of the week

  • Monday31 (14%)
  • Tuesday28 (13%)
  • Wednesday25 (12%)
  • Thursday43 (20%)
  • Friday33 (15%)
  • Saturday29 (13%)
  • Sunday26 (12%)

Collisions by time of day

  • 00:00 to 02:5913 (6%)
  • 03:00 to 05:597 (3.3%)
  • 06:00 to 08:5939 (18%)
  • 09:00 to 11:5920 (9.3%)
  • 12:00 to 14:5941 (19%)
  • 15:00 to 17:5942 (20%)
  • 18:00 to 20:5936 (17%)
  • 21:00 to 23:5917 (7.9%)

Collisions by month

  • January14 (6.5%)
  • February12 (5.6%)
  • March14 (6.5%)
  • April21 (9.8%)
  • May14 (6.5%)
  • June22 (10%)
  • July14 (6.5%)
  • August11 (5.1%)
  • September20 (9.3%)
  • October30 (14%)
  • November29 (13%)
  • December14 (6.5%)

Light conditions

  • Daylight143 (67%)
  • Dark, street lights lit53 (25%)
  • Dark, no street lighting15 (7%)
  • Dark, lighting unknown2 (0.9%)
  • Dark, street lights unlit2 (0.9%)

Weather at the time

  • Fine, no high winds174 (81%)
  • Raining, no high winds32 (15%)
  • Fine with high winds1 (0.5%)
  • Fog or mist1 (0.5%)
  • Raining with high winds1 (0.5%)
  • Snowing, no high winds1 (0.5%)
  • Other3 (1.4%)
  • Not recorded2 (0.9%)

Road surface

  • Dry142 (66%)
  • Wet or damp59 (27%)
  • Frost or ice4 (1.9%)
  • Snow1 (0.5%)
  • Not recorded9 (4.2%)

Speed limit at the scene

  • 20 mph8 (3.7%)
  • 30 mph103 (48%)
  • 40 mph17 (7.9%)
  • 50 mph5 (2.3%)
  • 60 mph29 (13%)
  • 70 mph53 (25%)

Type of road

  • Single carriageway128 (60%)
  • Dual carriageway54 (25%)
  • Roundabout21 (9.8%)
  • One way street or slip road11 (5.1%)
  • Not recorded1 (0.5%)

Source: Department for Transport, STATS19 road safety data

Who was hurt in road crashes in Hertsmere in 2021

Casualties by road user

  • Car occupant209 (71%)
  • Motorcyclist23 (7.8%)
  • Pedestrian23 (7.8%)
  • Cyclist20 (6.8%)
  • Van occupant15 (5.1%)
  • Minibus occupant2 (0.7%)
  • Goods vehicle occupant (weight unknown)1 (0.3%)
  • Not recorded2 (0.7%)

Casualties by age

  • 0 to 55 (1.7%)
  • 6 to 104 (1.4%)
  • 11 to 156 (2%)
  • 16 to 2029 (9.8%)
  • 21 to 2539 (13%)
  • 26 to 3572 (24%)
  • 36 to 4552 (18%)
  • 46 to 5540 (14%)
  • 56 to 6515 (5.1%)
  • 66 to 7513 (4.4%)
  • Over 7512 (4.1%)
  • Not recorded8 (2.7%)

Drivers, passengers and pedestrians

  • Driver or rider205 (69%)
  • Passenger67 (23%)
  • Pedestrian23 (7.8%)

Vehicles involved

  • Car318 (74%)
  • Van or goods vehicle up to 3.5 tonnes37 (8.6%)
  • Motorcycle24 (5.6%)
  • Pedal cycle20 (4.7%)
  • Goods vehicle, weight unknown9 (2.1%)
  • Goods vehicle over 3.5 tonnes8 (1.9%)
  • Other vehicle7 (1.6%)
  • Personal powered transporter (e-scooter or similar)2 (0.5%)
  • Bus or coach1 (0.2%)
  • Minibus1 (0.2%)
  • Not recorded1 (0.2%)

Source: Department for Transport, STATS19 road safety data

Crash map for Hertsmere in 2021

Map of the last 24 crashes of 2021 and the 10 busiest accident hotspots in Hertsmere

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

  • 24 crashes
  • Fatal
  • Serious
  • Slight

Accident hotspots (10)

How Hertsmere ranked among 350 areas in 2021

Of the 350 areas in England, Scotland and Wales, Hertsmere had the 162nd most road collisions in 2021.

Collisions
162nd
highest of 350 areas
Casualties
151st
highest of 350 areas
Fatal collisions
117th
highest of 350 areas
Serious collisions
254th
of 350 areas, highest first

Accident hotspots in Hertsmere in 2021

Potters Bar Oakmere, Hertsmere, EN6 5ES area was the busiest accident hotspot in Hertsmere in 2021, with 19 collisions, 3 of them serious.

Roads in Hertsmere with the most crashes in 2021

The M25 had the most collisions in Hertsmere in 2021: 26, including 3 serious.

Roads ranked by collisions in Hertsmere, 2021
RankRoadCollisionsCasualtiesFatalSerious
1stM25264103
2ndA1142512
3rdA41121300
4thA411101503
5thB537891001
6thM191800
7thA40088900
8thB55681203
9thA10817901
10thA518371000
11thB4627902
12thA1(M)6810
13thA10006703
14thA1116710
15thA51355600
16thA41403302
17thA10052300
18thA4091301

Towns in Hertsmere: crashes in 2021

Borehamwood had the most collisions of any town in Hertsmere in 2021: 33.

Postcode districts in Hertsmere: crashes in 2021

EN6 had the most collisions of any postcode district in Hertsmere in 2021: 57.

Latest crashes in Hertsmere in 2021

Of the last 24 crashes in Hertsmere in 2021, 2 were fatal and 2 were serious. The last was on 28 December 2021.

Severity

Hertsmere road accidents in other years