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CrashStats

B857 accidents: crash map and statistics

Police recorded 430 collisions on the B857 from 1979 to 2024, with 551 casualties. Of those crashes, 6 were fatal and 101 serious, and 6 people were killed.

No collisions were recorded on the B857 in 2025, after 5 in 2024.

Collisions since 1979
430
2,190th highest of 4,923 roads
Casualties
551
1.28 per collision
Fatal collisions
6
6 people killed
Serious collisions
101
111 seriously injured
Collisions in 2025
0
5 in 2024
Casualties in 2025
0
6 in 2024

Crash severity on the B857

On the B857, 1.4% of collisions were fatal and 23% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2024

  • Fatal61.4%
  • Serious10123%
  • Slight32375%

Where the B857 ranks among 4,923 roads

Most collisions
2,190th
Most casualties
2,271st
Most fatal collisions
2,299th
Most serious collisions
1,898th

B857 accidents by year

Collisions on the B857 peaked at 22 in 1980; none were recorded in 2025.

Collisions and casualties on the B857, 1979 to 2025

  • Collisions
  • Collisions in 2025
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202500
202456
202333
202223
202111
202045
201946
201822
201767
201666
201589
201444
201358
201267
201178
201078
2009911
200867
2007610
200679
2005916
200479
20031320
20021014
2001810
2000916
19991216
19981418
19971418
1996917
19951115
19941314
19931011
1992812
19911012
19901620
19891112
19881012
19871516
1986910
19851217
19841518
198377
19822131
19811519
19802226
19792225

When crashes happen on the B857

Thursday has the most collisions on the B857 (80), and 3pm to 6pm is the busiest time of day (126).

Collisions by day of the week

  • Monday59 (14%)
  • Tuesday61 (14%)
  • Wednesday58 (13%)
  • Thursday80 (19%)
  • Friday68 (16%)
  • Saturday68 (16%)
  • Sunday36 (8.4%)

Collisions by time of day

  • Midnight to 3am13 (3%)
  • 3am to 6am1 (0.2%)
  • 6am to 9am35 (8.1%)
  • 9am to noon50 (12%)
  • Noon to 3pm86 (20%)
  • 3pm to 6pm126 (29%)
  • 6pm to 9pm72 (17%)
  • 9pm to midnight47 (11%)

Collisions by month

  • January29 (6.7%)
  • February44 (10%)
  • March40 (9.3%)
  • April20 (4.7%)
  • May37 (8.6%)
  • June33 (7.7%)
  • July22 (5.1%)
  • August44 (10%)
  • September55 (13%)
  • October36 (8.4%)
  • November29 (6.7%)
  • December41 (9.5%)

Light conditions at the time

  • Daylight294 (68%)
  • Dark, street lights lit124 (29%)
  • Dark, no street lighting6 (1.4%)
  • Dark, lighting unknown3 (0.7%)
  • Dark, street lights unlit3 (0.7%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B857 crashes

On the B857, 96% of collisions happened where the speed limit was 30 mph and 57% on a dry road surface.

Speed limit at the scene

  • 30 mph411 (96%)
  • 40 mph4 (0.9%)
  • 50 mph1 (0.2%)
  • 60 mph14 (3.3%)

Weather at the time

  • Fine, no high winds320 (74%)
  • Raining, no high winds75 (17%)
  • Raining with high winds13 (3%)
  • Fine with high winds5 (1.2%)
  • Snowing, no high winds4 (0.9%)
  • Other13 (3%)

Road surface

  • Dry247 (57%)
  • Wet or damp171 (40%)
  • Frost or ice6 (1.4%)
  • Snow6 (1.4%)

Type of road

  • Single carriageway382 (89%)
  • Roundabout31 (7.2%)
  • Dual carriageway15 (3.5%)
  • One way street or slip road2 (0.5%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B857 crashes

Car occupants make up 49% of the people killed or injured on the B857, followed by pedestrians (33%).

Casualties by road user

  • Car occupant270 (49%)
  • Pedestrian184 (33%)
  • Motorcyclist29 (5.3%)
  • Cyclist27 (4.9%)
  • Bus or coach occupant15 (2.7%)
  • Taxi or private hire car occupant13 (2.4%)
  • Van occupant7 (1.3%)
  • Other6 (1.1%)

Vehicles involved

  • Car538 (78%)
  • Motorcycle35 (5.1%)
  • Pedal cycle27 (3.9%)
  • Bus or coach23 (3.3%)
  • Van or goods vehicle up to 3.5 tonnes23 (3.3%)
  • Taxi or private hire car21 (3%)
  • Other vehicle10 (1.5%)
  • Other12 (1.7%)

Casualties by age

  • 0 to 57 (1.3%)
  • 6 to 1047 (8.5%)
  • 11 to 1566 (12%)
  • 16 to 2076 (14%)
  • 21 to 2567 (12%)
  • 26 to 3572 (13%)
  • 36 to 4569 (13%)
  • 46 to 5548 (8.7%)
  • 56 to 6537 (6.7%)
  • 66 to 7528 (5.1%)
  • Over 7534 (6.2%)

Drivers, passengers and pedestrians

  • Driver or rider216 (39%)
  • Pedestrian184 (33%)
  • Passenger151 (27%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B857

Map of the 25 most recent crashes on the B857

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B857 crashes by council area

Of the 430 collisions on the B857, 424 were in West Dunbartonshire.

Collisions on the B857 in each area, 1979 to 2024
RankAreaCollisionsCasualtiesFatalSerious
1stWest Dunbartonshire4245426100

B857 crashes by town

Collisions on the B857 were recorded in 2 towns and built-up areas, led by Alexandria (267) and Bonhill and Renton (83).

Recent crashes on the B857

These are the 25 most recent collisions on the B857, from 27 April 2017 to 19 December 2024.

Severity