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CrashStats

B4506 accidents: crash map and statistics

Police recorded 291 collisions on the B4506 from 1979 to 2025, with 445 casualties. Of those crashes, 7 were fatal and 76 serious, and 7 people were killed.

In 2025 there was 1 collision on the B4506, up from none in 2024, with 1 casualty.

Collisions since 1979
291
2,740th highest of 4,923 roads
Casualties
445
1.53 per collision
Fatal collisions
7
7 people killed
Serious collisions
76
97 seriously injured
Collisions in 2025
1
Up from none in 2024
Casualties in 2025
1
Up from none in 2024

Crash severity on the B4506

On the B4506, 2.4% of collisions were fatal and 26% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal72.4%
  • Serious7626%
  • Slight20871%

Where the B4506 ranks among 4,923 roads

Most collisions
2,740th
Most casualties
2,573rd
Most fatal collisions
2,103rd
Most serious collisions
2,368th

B4506 accidents by year

Collisions on the B4506 peaked at 15 in 1990 and were down to 1 in 2025.

Collisions and casualties on the B4506, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202400
202322
202224
202134
202056
201923
201844
201711
201667
201522
201435
201334
201269
201122
201069
2009712
200859
200747
200644
200579
2004611
2003815
2002913
200167
200068
199923
19981116
1997612
1996815
1995910
1994815
1993911
19921024
1991916
19901517
19891422
1988711
1987815
19861017
198545
1984814
19831012
1982610
19811016
1980610
19791116

When crashes happen on the B4506

Friday has the most collisions on the B4506 (54), and 9am to noon is the busiest time of day (59).

Collisions by day of the week

  • Monday35 (12%)
  • Tuesday46 (16%)
  • Wednesday38 (13%)
  • Thursday34 (12%)
  • Friday54 (19%)
  • Saturday44 (15%)
  • Sunday40 (14%)

Collisions by time of day

  • Midnight to 3am13 (4.5%)
  • 3am to 6am1 (0.3%)
  • 6am to 9am50 (17%)
  • 9am to noon59 (20%)
  • Noon to 3pm40 (14%)
  • 3pm to 6pm51 (18%)
  • 6pm to 9pm47 (16%)
  • 9pm to midnight30 (10%)

Collisions by month

  • January27 (9.3%)
  • February12 (4.1%)
  • March21 (7.2%)
  • April16 (5.5%)
  • May27 (9.3%)
  • June34 (12%)
  • July30 (10%)
  • August26 (8.9%)
  • September29 (10%)
  • October23 (7.9%)
  • November34 (12%)
  • December12 (4.1%)

Light conditions at the time

  • Daylight216 (74%)
  • Dark, no street lighting60 (21%)
  • Dark, street lights lit12 (4.1%)
  • Dark, lighting unknown2 (0.7%)
  • Dark, street lights unlit1 (0.3%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4506 crashes

On the B4506, 72% of collisions happened where the speed limit was 60 mph and 56% on a dry road surface.

Speed limit at the scene

  • 30 mph43 (15%)
  • 40 mph25 (8.6%)
  • 50 mph10 (3.4%)
  • 60 mph210 (72%)
  • 70 mph3 (1%)

Weather at the time

  • Fine, no high winds230 (79%)
  • Raining, no high winds41 (14%)
  • Snowing, no high winds5 (1.7%)
  • Fine with high winds4 (1.4%)
  • Other9 (3.1%)
  • Not recorded2 (0.7%)

Road surface

  • Dry163 (56%)
  • Wet or damp113 (39%)
  • Frost or ice12 (4.1%)
  • Snow3 (1%)

Type of road

  • Single carriageway291 (100%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4506 crashes

Car occupants make up 75% of the people killed or injured on the B4506, followed by motorcyclists (9.7%).

Casualties by road user

  • Car occupant335 (75%)
  • Motorcyclist43 (9.7%)
  • Pedestrian16 (3.6%)
  • Van occupant15 (3.4%)
  • Minibus occupant14 (3.1%)
  • Cyclist12 (2.7%)
  • Goods vehicle occupant (over 3.5 tonnes)10 (2.2%)

Vehicles involved

  • Car405 (77%)
  • Motorcycle39 (7.4%)
  • Van or goods vehicle up to 3.5 tonnes33 (6.3%)
  • Goods vehicle over 3.5 tonnes29 (5.5%)
  • Pedal cycle12 (2.3%)
  • Bus or coach2 (0.4%)
  • Other4 (0.8%)
  • Not recorded1 (0.2%)

Casualties by age

  • 0 to 55 (1.1%)
  • 6 to 1010 (2.2%)
  • 11 to 1515 (3.4%)
  • 16 to 2096 (22%)
  • 21 to 2564 (14%)
  • 26 to 3593 (21%)
  • 36 to 4565 (15%)
  • 46 to 5542 (9.4%)
  • 56 to 6519 (4.3%)
  • 66 to 7516 (3.6%)
  • Over 7516 (3.6%)
  • Not recorded4 (0.9%)

Drivers, passengers and pedestrians

  • Driver or rider296 (67%)
  • Passenger133 (30%)
  • Pedestrian16 (3.6%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4506

Map of the 25 most recent crashes on the B4506

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

  • 25 crashes
  • Serious
  • Slight

B4506 crashes by council area

Collisions on the B4506 were recorded in 3 council areas. Dacorum has the most, with 187, followed by Buckinghamshire (65) and Central Bedfordshire (38).

Collisions on the B4506 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stDacorum187300459
2ndBuckinghamshire6586014
3rdCentral Bedfordshire385833

B4506 crashes by town

Of the 291 collisions on the B4506, 13 were in the built-up area of Berkhamsted.

Recent crashes on the B4506

These are the 25 most recent collisions on the B4506, from 27 May 2016 to 24 November 2025.

Severity