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CrashStats

B157 accidents: crash map and statistics

Police recorded 221 collisions on the B157 from 1979 to 2025, with 327 casualties. Of those crashes, 4 were fatal and 45 serious, and 4 people were killed.

In 2025 there were 3 collisions on the B157, down 40% from 5 in 2024, with 4 casualties.

Collisions since 1979
221
3,113th highest of 4,923 roads
Casualties
327
1.48 per collision
Fatal collisions
4
4 people killed
Serious collisions
45
56 seriously injured
Collisions in 2025
3
Down 40% on 2024
Casualties in 2025
4
Down 50% on 2024

Crash severity on the B157

On the B157, 1.8% of collisions were fatal and 20% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal41.8%
  • Serious4520%
  • Slight17278%

Where the B157 ranks among 4,923 roads

Most collisions
3,113th
Most casualties
3,006th
Most fatal collisions
2,815th
Most serious collisions
3,115th

B157 accidents by year

Collisions on the B157 peaked at 13 in 1983 and were down to 3 in 2025.

Collisions and casualties on the B157, 1979 to 2025

  • Collisions
  • Collisions in 2025: 3
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202534
202458
202311
202269
202100
202022
201945
201838
201725
201657
201557
201422
201311
201223
201112
201014
200968
200833
200735
200646
200569
200445
200357
200246
2001810
200033
199944
19981123
199722
199656
199557
199448
199344
199244
199136
199033
198958
19881011
1987814
1986913
198522
19841118
19831324
1982912
1981811
198045
1979812

When crashes happen on the B157

Saturday has the most collisions on the B157 (43), and noon to 3pm is the busiest time of day (42).

Collisions by day of the week

  • Monday23 (10%)
  • Tuesday33 (15%)
  • Wednesday18 (8.1%)
  • Thursday23 (10%)
  • Friday38 (17%)
  • Saturday43 (19%)
  • Sunday43 (19%)

Collisions by time of day

  • Midnight to 3am23 (10%)
  • 3am to 6am9 (4.1%)
  • 6am to 9am33 (15%)
  • 9am to noon27 (12%)
  • Noon to 3pm42 (19%)
  • 3pm to 6pm29 (13%)
  • 6pm to 9pm25 (11%)
  • 9pm to midnight33 (15%)

Collisions by month

  • January24 (11%)
  • February7 (3.2%)
  • March19 (8.6%)
  • April17 (7.7%)
  • May9 (4.1%)
  • June13 (5.9%)
  • July23 (10%)
  • August20 (9%)
  • September18 (8.1%)
  • October18 (8.1%)
  • November30 (14%)
  • December23 (10%)

Light conditions at the time

  • Daylight132 (60%)
  • Dark, no street lighting45 (20%)
  • Dark, street lights lit40 (18%)
  • Dark, lighting unknown2 (0.9%)
  • Dark, street lights unlit2 (0.9%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B157 crashes

On the B157, 40% of collisions happened where the speed limit was 30 mph and 48% on a dry road surface.

Speed limit at the scene

  • 30 mph88 (40%)
  • 40 mph42 (19%)
  • 50 mph3 (1.4%)
  • 60 mph84 (38%)
  • 70 mph4 (1.8%)

Weather at the time

  • Fine, no high winds153 (69%)
  • Raining, no high winds41 (19%)
  • Fog or mist6 (2.7%)
  • Fine with high winds3 (1.4%)
  • Other17 (7.7%)
  • Not recorded1 (0.5%)

Road surface

  • Dry107 (48%)
  • Wet or damp100 (45%)
  • Frost or ice10 (4.5%)
  • Snow4 (1.8%)

Type of road

  • Single carriageway205 (93%)
  • Dual carriageway1 (0.5%)
  • Not recorded15 (6.8%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B157 crashes

Car occupants make up 87% of the people killed or injured on the B157, followed by motorcyclists (5.5%).

Casualties by road user

  • Car occupant283 (87%)
  • Motorcyclist18 (5.5%)
  • Cyclist9 (2.8%)
  • Van occupant9 (2.8%)
  • Taxi or private hire car occupant3 (0.9%)
  • Goods vehicle occupant (over 3.5 tonnes)2 (0.6%)
  • Pedestrian2 (0.6%)
  • Other vehicle occupant1 (0.3%)

Vehicles involved

  • Car333 (83%)
  • Van or goods vehicle up to 3.5 tonnes26 (6.5%)
  • Motorcycle19 (4.8%)
  • Pedal cycle9 (2.3%)
  • Goods vehicle over 3.5 tonnes7 (1.8%)
  • Other vehicle2 (0.5%)
  • Agricultural vehicle1 (0.3%)
  • Other2 (0.5%)

Casualties by age

  • 0 to 53 (0.9%)
  • 6 to 106 (1.8%)
  • 11 to 155 (1.5%)
  • 16 to 2082 (25%)
  • 21 to 2551 (16%)
  • 26 to 3541 (13%)
  • 36 to 4555 (17%)
  • 46 to 5532 (9.8%)
  • 56 to 6523 (7%)
  • 66 to 7512 (3.7%)
  • Over 7510 (3.1%)
  • Not recorded7 (2.1%)

Drivers, passengers and pedestrians

  • Driver or rider235 (72%)
  • Passenger90 (28%)
  • Pedestrian2 (0.6%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B157

Map of the 25 most recent crashes on the B157

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

  • 25 crashes
  • Serious
  • Slight

B157 crashes by council area

Collisions on the B157 were recorded in 3 council areas. Welwyn Hatfield has the most, with 194, followed by Broxbourne (21) and Hertsmere (3).

Collisions on the B157 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stWelwyn Hatfield194292440
2ndBroxbourne212905
3rdHertsmere3300

B157 crashes by town

Collisions on the B157 were recorded in 2 towns and built-up areas, led by Cuffley (94) and Brookmans Park (43).

Recent crashes on the B157

These are the 25 most recent collisions on the B157, from 1 December 2017 to 22 September 2025.

Severity