Skip to main content
CrashStats

Dacorum road accidents in 2021: crash map and statistics

Police recorded 171 road traffic collisions in Dacorum in 2021, and 227 people were killed or injured in them. Of those collisions, 2 were fatal and 39 were serious.

Collisions were up 20% on 2020 (143), and casualties rose from 189.

Across all years from 1979 to 2025, police recorded 20,193 collisions in Dacorum.

Collisions in 2021
171
Up 20% on 2020
Casualties in 2021
227
Up 20% on 2020
Fatal collisions
2
1.2% of collisions
Serious collisions
39
23% of collisions

Crash severity in Dacorum in 2021

1.2% of collisions in Dacorum in 2021 were fatal and 23% serious, against 1.3% and 20% in Dacorum from 1979 to 2025.

Collisions by worst injury

  • Fatal21.2%
  • Serious3923%
  • Slight13076%

People hurt, by injury

  • Fatal20.9%
  • Serious4018%
  • Slight18581%

Dacorum road accidents by year

Collisions and casualties in Dacorum, 1979 to 2025

Collisions peaked at 670 in 2000. 2021 is highlighted, with 171, up 20% on 2020.

  • Collisions
  • Collisions in 2021: 171
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
2025161207
2024160205
2023193273
2022187262
2021171227
2020143189
2019201267
2018194259
2017238327
2016234325
2015233323
2014239344
2013238307
2012285382
2011329437
2010325445
2009308454
2008363507
2007403586
2006431622
2005434638
2004459712
2003475725
2002515776
2001591890
2000670999
1999592866
1998610907
1997611887
1996587944
1995561835
1994540719
1993555817
1992543769
1991500678
1990610860
1989611827
1988590816
1987592810
1986622826
1985527732
1984544773
1983519679
1982546760
1981564757
1980621845
1979568780

When and where crashes happen in Dacorum in 2021

Collisions by day of the week

  • Monday27 (16%)
  • Tuesday31 (18%)
  • Wednesday18 (11%)
  • Thursday23 (13%)
  • Friday29 (17%)
  • Saturday20 (12%)
  • Sunday23 (13%)

Collisions by time of day

  • 00:00 to 02:597 (4.1%)
  • 03:00 to 05:590 (0%)
  • 06:00 to 08:5933 (19%)
  • 09:00 to 11:5919 (11%)
  • 12:00 to 14:5929 (17%)
  • 15:00 to 17:5943 (25%)
  • 18:00 to 20:5930 (18%)
  • 21:00 to 23:5910 (5.8%)

Collisions by month

  • January10 (5.8%)
  • February14 (8.2%)
  • March14 (8.2%)
  • April15 (8.8%)
  • May11 (6.4%)
  • June16 (9.4%)
  • July15 (8.8%)
  • August10 (5.8%)
  • September7 (4.1%)
  • October30 (18%)
  • November18 (11%)
  • December11 (6.4%)

Light conditions

  • Daylight123 (72%)
  • Dark, street lights lit37 (22%)
  • Dark, no street lighting8 (4.7%)
  • Dark, lighting unknown2 (1.2%)
  • Dark, street lights unlit1 (0.6%)

Weather at the time

  • Fine, no high winds143 (84%)
  • Raining, no high winds19 (11%)
  • Snowing, no high winds2 (1.2%)
  • Fine with high winds1 (0.6%)
  • Fog or mist1 (0.6%)
  • Other3 (1.8%)
  • Not recorded2 (1.2%)

Road surface

  • Dry121 (71%)
  • Wet or damp39 (23%)
  • Frost or ice3 (1.8%)
  • Snow1 (0.6%)
  • Not recorded7 (4.1%)

Speed limit at the scene

  • 20 mph3 (1.8%)
  • 30 mph95 (56%)
  • 40 mph23 (13%)
  • 50 mph11 (6.4%)
  • 60 mph13 (7.6%)
  • 70 mph26 (15%)

Type of road

  • Single carriageway119 (70%)
  • Dual carriageway37 (22%)
  • Roundabout10 (5.8%)
  • One way street or slip road4 (2.3%)
  • Not recorded1 (0.6%)

Source: Department for Transport, STATS19 road safety data

Who was hurt in road crashes in Dacorum in 2021

Casualties by road user

  • Car occupant135 (59%)
  • Pedestrian31 (14%)
  • Cyclist22 (9.7%)
  • Motorcyclist15 (6.6%)
  • Van occupant15 (6.6%)
  • Goods vehicle occupant (over 3.5 tonnes)4 (1.8%)
  • Goods vehicle occupant (weight unknown)2 (0.9%)
  • E-scooter or powered transporter user1 (0.4%)
  • Not recorded2 (0.9%)

Casualties by age

  • 0 to 54 (1.8%)
  • 6 to 107 (3.1%)
  • 11 to 1517 (7.5%)
  • 16 to 2023 (10%)
  • 21 to 2529 (13%)
  • 26 to 3547 (21%)
  • 36 to 4536 (16%)
  • 46 to 5532 (14%)
  • 56 to 6513 (5.7%)
  • 66 to 758 (3.5%)
  • Over 756 (2.6%)
  • Not recorded5 (2.2%)

Drivers, passengers and pedestrians

  • Driver or rider158 (70%)
  • Passenger38 (17%)
  • Pedestrian31 (14%)

Vehicles involved

  • Car228 (71%)
  • Van or goods vehicle up to 3.5 tonnes29 (9.1%)
  • Pedal cycle22 (6.9%)
  • Motorcycle17 (5.3%)
  • Goods vehicle over 3.5 tonnes9 (2.8%)
  • Goods vehicle, weight unknown7 (2.2%)
  • Other vehicle3 (0.9%)
  • Bus or coach2 (0.6%)
  • Personal powered transporter (e-scooter or similar)2 (0.6%)
  • Not recorded1 (0.3%)

Source: Department for Transport, STATS19 road safety data

Crash map for Dacorum in 2021

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

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 Dacorum ranked among 350 areas in 2021

Of the 350 areas in England, Scotland and Wales, Dacorum had fewer road collisions than 217 of them in 2021.

Collisions
218th
of 350 areas, highest first
Casualties
215th
of 350 areas, highest first
Fatal collisions
212th
of 350 areas, highest first
Serious collisions
223rd
of 350 areas, highest first

Accident hotspots in Dacorum in 2021

Adeyfield West, Dacorum, HP2 4BH area and Hemel Hempstead Town, Dacorum, HP1 1BG area were among the busiest accident hotspots in Dacorum in 2021, with 12 collisions each.

Roads in Dacorum with the most crashes in 2021

The A41, A414 and A4251 had the most collisions in Dacorum in 2021, with 14 each.

Roads ranked by collisions in Dacorum, 2021
RankRoadCollisionsCasualtiesFatalSerious
1stA41141813
2ndA414142102
3rdA4251141913
4thA4147111602
5thM192003
6thA51834600
7thB4874402
8thA41463301
9thB45053500
10thB45063400
11thB4883300
12thA4162201
13thM252300
14thB4401301
15thB4861200

Towns in Dacorum: crashes in 2021

Hemel Hempstead had the most collisions of any town in Dacorum in 2021: 88.

Postcode districts in Dacorum: crashes in 2021

HP2 had the most collisions of any postcode district in Dacorum in 2021: 47.

Latest crashes in Dacorum in 2021

Of the last 24 crashes in Dacorum in 2021, 1 was fatal and 3 were serious. The last was on 26 December 2021.

Severity

Dacorum road accidents in other years