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CrashStats

B156 accidents: crash map and statistics

Police recorded 1,163 collisions on the B156 from 1983 to 2025, with 1,562 casualties. Of those crashes, 8 were fatal and 176 serious, and 8 people were killed.

In 2025 there were 11 collisions on the B156, down 35% from 17 in 2024, with 13 casualties.

Collisions since 1983
1,163
941st highest of 4,923 roads
Casualties
1,562
1.34 per collision
Fatal collisions
8
8 people killed
Serious collisions
176
192 seriously injured
Collisions in 2025
11
Down 35% on 2024
Casualties in 2025
13
Down 46% on 2024

Crash severity on the B156

On the B156, 0.7% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1983 to 2025

  • Fatal80.7%
  • Serious17615%
  • Slight97984%

Where the B156 ranks among 4,923 roads

Most collisions
941st
Most casualties
956th
Most fatal collisions
1,937th
Most serious collisions
1,180th

B156 accidents by year

Collisions on the B156 peaked at 54 in 1989 and were down to 11 in 2025.

Collisions and casualties on the B156, 1983 to 2025

  • Collisions
  • Collisions in 2025: 11
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251113
20241724
20231924
20221423
20211011
2020910
20191119
2018814
20172021
20161520
20152129
20143349
20131723
20122435
20111727
20101823
20091726
20082026
20073747
20062125
20053358
20043050
20033241
20023451
20013045
20003947
19992632
19982737
19973040
19963447
19952629
19943538
19933236
19923445
19913346
19903950
19895474
19884352
19874056
19864457
19853137
19844465
19833440

When crashes happen on the B156

Friday has the most collisions on the B156 (209), and 3pm to 6pm is the busiest time of day (272).

Collisions by day of the week

  • Monday141 (12%)
  • Tuesday182 (16%)
  • Wednesday170 (15%)
  • Thursday160 (14%)
  • Friday209 (18%)
  • Saturday168 (14%)
  • Sunday133 (11%)

Collisions by time of day

  • Midnight to 3am47 (4%)
  • 3am to 6am14 (1.2%)
  • 6am to 9am150 (13%)
  • 9am to noon155 (13%)
  • Noon to 3pm196 (17%)
  • 3pm to 6pm272 (23%)
  • 6pm to 9pm208 (18%)
  • 9pm to midnight121 (10%)

Collisions by month

  • January110 (9.5%)
  • February91 (7.8%)
  • March108 (9.3%)
  • April88 (7.6%)
  • May101 (8.7%)
  • June96 (8.3%)
  • July94 (8.1%)
  • August76 (6.5%)
  • September100 (8.6%)
  • October97 (8.3%)
  • November101 (8.7%)
  • December101 (8.7%)

Light conditions at the time

  • Daylight808 (69%)
  • Dark, street lights lit302 (26%)
  • Dark, no street lighting37 (3.2%)
  • Dark, lighting unknown9 (0.8%)
  • Dark, street lights unlit7 (0.6%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B156 crashes

On the B156, 83% of collisions happened where the speed limit was 30 mph and 65% on a dry road surface.

Speed limit at the scene

  • 20 mph1 (0.1%)
  • 30 mph965 (83%)
  • 40 mph85 (7.3%)
  • 60 mph111 (9.5%)
  • 70 mph1 (0.1%)

Weather at the time

  • Fine, no high winds907 (78%)
  • Raining, no high winds179 (15%)
  • Fine with high winds14 (1.2%)
  • Fog or mist10 (0.9%)
  • Other43 (3.7%)
  • Not recorded10 (0.9%)

Road surface

  • Dry758 (65%)
  • Wet or damp369 (32%)
  • Frost or ice27 (2.3%)
  • Flood over 3cm deep3 (0.3%)
  • Snow3 (0.3%)
  • Not recorded3 (0.3%)

Type of road

  • Single carriageway1,031 (89%)
  • Roundabout118 (10%)
  • Dual carriageway8 (0.7%)
  • One way street or slip road6 (0.5%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B156 crashes

Car occupants make up 69% of the people killed or injured on the B156, followed by pedestrians (10%).

Casualties by road user

  • Car occupant1,078 (69%)
  • Pedestrian156 (10%)
  • Motorcyclist144 (9.2%)
  • Cyclist90 (5.8%)
  • Van occupant40 (2.6%)
  • Bus or coach occupant28 (1.8%)
  • Other vehicle occupant8 (0.5%)
  • Other18 (1.2%)

Vehicles involved

  • Car1,760 (80%)
  • Motorcycle150 (6.8%)
  • Van or goods vehicle up to 3.5 tonnes109 (4.9%)
  • Pedal cycle94 (4.2%)
  • Bus or coach32 (1.4%)
  • Goods vehicle over 3.5 tonnes32 (1.4%)
  • Other33 (1.5%)
  • Not recorded2 (0.1%)

Casualties by age

  • 0 to 521 (1.3%)
  • 6 to 1037 (2.4%)
  • 11 to 1589 (5.7%)
  • 16 to 20300 (19%)
  • 21 to 25218 (14%)
  • 26 to 35258 (17%)
  • 36 to 45199 (13%)
  • 46 to 55157 (10%)
  • 56 to 65123 (7.9%)
  • 66 to 7557 (3.6%)
  • Over 7550 (3.2%)
  • Not recorded53 (3.4%)

Drivers, passengers and pedestrians

  • Driver or rider1,043 (67%)
  • Passenger363 (23%)
  • Pedestrian156 (10%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B156

Map of the 25 most recent crashes on the B156

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

  • 25 crashes
  • Serious
  • Slight

B156 crashes by council area

Collisions on the B156 were recorded in 4 council areas. Broxbourne has the most, with 772, followed by Welwyn Hatfield (292) and Hertsmere (94).

Collisions on the B156 in each area, 1983 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stBroxbourne7721,017697
2ndWelwyn Hatfield292397167
3rdHertsmere94139112
4thEast Hertfordshire5900

B156 crashes by town

Collisions on the B156 were recorded in 5 towns and built-up areas, led by Cheshunt (434) and Goff's Oak (172).

Recent crashes on the B156

These are the 25 most recent collisions on the B156, from 20 March 2024 to 15 September 2025.

Severity