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CrashStats

B440 accidents: crash map and statistics

Police recorded 50 collisions on the B440 from 2017 to 2025, with 74 casualties. Of those crashes, 1 was fatal and 15 serious, and 1 person was killed.

In 2025 there were 9 collisions on the B440, up 29% from 7 in 2024, with 15 casualties.

Collisions since 2017
50
4,603rd highest of 4,923 roads
Casualties
74
1.48 per collision
Fatal collisions
1
1 person killed
Serious collisions
15
15 seriously injured
Collisions in 2025
9
Up 29% on 2024
Casualties in 2025
15
Up 50% on 2024

Crash severity on the B440

On the B440, 2% of collisions were fatal and 30% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 2017 to 2025

  • Fatal12%
  • Serious1530%
  • Slight3468%

Where the B440 ranks among 4,923 roads

Most collisions
4,603rd
Most casualties
4,538th
Most fatal collisions
3,933rd
Most serious collisions
4,304th

B440 accidents by year

2025 had the most collisions of any year on the B440, with 9.

Collisions and casualties on the B440, 2017 to 2025

  • Collisions
  • Collisions in 2025
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
2025915
2024710
2023610
202223
202169
202067
2019915
201844
201711

When crashes happen on the B440

Monday has the most collisions on the B440 (8), and 3pm to 6pm is the busiest time of day (10).

Collisions by day of the week

  • Monday8 (16%)
  • Tuesday7 (14%)
  • Wednesday8 (16%)
  • Thursday8 (16%)
  • Friday6 (12%)
  • Saturday6 (12%)
  • Sunday7 (14%)

Collisions by time of day

  • Midnight to 3am4 (8%)
  • 3am to 6am3 (6%)
  • 6am to 9am6 (12%)
  • 9am to noon8 (16%)
  • Noon to 3pm8 (16%)
  • 3pm to 6pm10 (20%)
  • 6pm to 9pm7 (14%)
  • 9pm to midnight4 (8%)

Collisions by month

  • January2 (4%)
  • February1 (2%)
  • March2 (4%)
  • April4 (8%)
  • May5 (10%)
  • June5 (10%)
  • July5 (10%)
  • August7 (14%)
  • September6 (12%)
  • October5 (10%)
  • November5 (10%)
  • December3 (6%)

Light conditions at the time

  • Daylight36 (72%)
  • Dark, no street lighting11 (22%)
  • Dark, street lights lit2 (4%)
  • Dark, lighting unknown1 (2%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B440 crashes

On the B440, 38% of collisions happened where the speed limit was 60 mph and 74% on a dry road surface.

Speed limit at the scene

  • 30 mph15 (30%)
  • 40 mph10 (20%)
  • 50 mph6 (12%)
  • 60 mph19 (38%)

Weather at the time

  • Fine, no high winds44 (88%)
  • Raining, no high winds4 (8%)
  • Fog or mist1 (2%)
  • Raining with high winds1 (2%)

Road surface

  • Dry37 (74%)
  • Wet or damp13 (26%)

Type of road

  • Single carriageway43 (86%)
  • Roundabout6 (12%)
  • Dual carriageway1 (2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B440 crashes

Car occupants make up 66% of the people killed or injured on the B440, followed by motorcyclists (11%).

Casualties by road user

  • Car occupant49 (66%)
  • Motorcyclist8 (11%)
  • Van occupant7 (9.5%)
  • Cyclist6 (8.1%)
  • Bus or coach occupant2 (2.7%)
  • E-scooter or powered transporter user1 (1.4%)
  • Pedestrian1 (1.4%)

Vehicles involved

  • Car71 (70%)
  • Van or goods vehicle up to 3.5 tonnes12 (12%)
  • Motorcycle9 (8.8%)
  • Pedal cycle6 (5.9%)
  • Bus or coach1 (1%)
  • Goods vehicle over 3.5 tonnes1 (1%)
  • Other vehicle1 (1%)
  • Not recorded1 (1%)

Casualties by age

  • 0 to 51 (1.4%)
  • 11 to 151 (1.4%)
  • 16 to 2012 (16%)
  • 21 to 2510 (14%)
  • 26 to 3510 (14%)
  • 36 to 458 (11%)
  • 46 to 5512 (16%)
  • 56 to 6514 (19%)
  • 66 to 752 (2.7%)
  • Over 752 (2.7%)
  • Not recorded2 (2.7%)

Drivers, passengers and pedestrians

  • Driver or rider64 (86%)
  • Passenger9 (12%)
  • Pedestrian1 (1.4%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B440

Map of the 25 most recent crashes on the B440

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B440 crashes by council area

Collisions on the B440 were recorded in 3 council areas. Dacorum has the most, with 25, followed by Buckinghamshire (13) and Central Bedfordshire (12).

Collisions on the B440 in each area, 2017 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stDacorum253819
2ndBuckinghamshire131803
3rdCentral Bedfordshire121803

Recent crashes on the B440

These are the 25 most recent collisions on the B440, from 26 July 2021 to 15 December 2025.

Severity