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CrashStats

B377 accidents: crash map and statistics

Police recorded 881 collisions on the B377 from 1979 to 2025, with 1,140 casualties. Of those crashes, 8 were fatal and 133 serious, and 8 people were killed.

In 2025 there were 11 collisions on the B377, up 38% from 8 in 2024, with 11 casualties.

Collisions since 1979
881
1,222nd highest of 4,923 roads
Casualties
1,140
1.29 per collision
Fatal collisions
8
8 people killed
Serious collisions
133
147 seriously injured
Collisions in 2025
11
Up 38% on 2024
Casualties in 2025
11
Up 10% on 2024

Crash severity on the B377

On the B377, 0.9% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal80.9%
  • Serious13315%
  • Slight74084%

Where the B377 ranks among 4,923 roads

Most collisions
1,222nd
Most casualties
1,277th
Most fatal collisions
1,937th
Most serious collisions
1,517th

B377 accidents by year

Collisions on the B377 peaked at 39 in 1980 and were down to 11 in 2025.

Collisions and casualties on the B377, 1979 to 2025

  • Collisions
  • Collisions in 2025: 11
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251111
2024810
20231112
20221115
20211416
2020811
20191418
2018911
2017812
20161719
20151620
20141519
20131920
20121518
20111626
20101430
20092332
2008911
20071826
20062024
20051319
20041721
20031523
20021114
20011317
20002033
19991826
19981016
19972635
19962732
19951520
19941825
19931515
19921519
19912428
19902937
19892024
19882634
19872730
19862536
19853752
19842939
19832124
19822833
19813848
19803944
19792935

When crashes happen on the B377

Wednesday has the most collisions on the B377 (140), and 3pm to 6pm is the busiest time of day (201).

Collisions by day of the week

  • Monday131 (15%)
  • Tuesday135 (15%)
  • Wednesday140 (16%)
  • Thursday123 (14%)
  • Friday136 (15%)
  • Saturday124 (14%)
  • Sunday92 (10%)

Collisions by time of day

  • Midnight to 3am34 (3.9%)
  • 3am to 6am16 (1.8%)
  • 6am to 9am113 (13%)
  • 9am to noon106 (12%)
  • Noon to 3pm143 (16%)
  • 3pm to 6pm201 (23%)
  • 6pm to 9pm168 (19%)
  • 9pm to midnight100 (11%)

Collisions by month

  • January73 (8.3%)
  • February64 (7.3%)
  • March69 (7.8%)
  • April72 (8.2%)
  • May72 (8.2%)
  • June74 (8.4%)
  • July71 (8.1%)
  • August60 (6.8%)
  • September85 (9.6%)
  • October81 (9.2%)
  • November88 (10%)
  • December72 (8.2%)

Light conditions at the time

  • Daylight583 (66%)
  • Dark, street lights lit271 (31%)
  • Dark, lighting unknown17 (1.9%)
  • Dark, no street lighting5 (0.6%)
  • Dark, street lights unlit5 (0.6%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B377 crashes

On the B377, 88% of collisions happened where the speed limit was 30 mph and 71% on a dry road surface.

Speed limit at the scene

  • 20 mph2 (0.2%)
  • 30 mph772 (88%)
  • 40 mph93 (11%)
  • 50 mph3 (0.3%)
  • 60 mph10 (1.1%)
  • 70 mph1 (0.1%)

Weather at the time

  • Fine, no high winds629 (71%)
  • Raining, no high winds113 (13%)
  • Raining with high winds8 (0.9%)
  • Snowing, no high winds8 (0.9%)
  • Other104 (12%)
  • Not recorded19 (2.2%)

Road surface

  • Dry623 (71%)
  • Wet or damp231 (26%)
  • Frost or ice16 (1.8%)
  • Snow9 (1%)
  • Flood over 3cm deep1 (0.1%)
  • Not recorded1 (0.1%)

Type of road

  • Single carriageway660 (75%)
  • Roundabout136 (15%)
  • Dual carriageway16 (1.8%)
  • One way street or slip road9 (1%)
  • Not recorded60 (6.8%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B377 crashes

Car occupants make up 60% of the people killed or injured on the B377, followed by cyclists (14%).

Casualties by road user

  • Car occupant687 (60%)
  • Cyclist156 (14%)
  • Motorcyclist146 (13%)
  • Pedestrian100 (8.8%)
  • Van occupant31 (2.7%)
  • Bus or coach occupant7 (0.6%)
  • Other11 (1%)
  • Not recorded2 (0.2%)

Vehicles involved

  • Car1,201 (73%)
  • Pedal cycle158 (9.6%)
  • Motorcycle152 (9.3%)
  • Van or goods vehicle up to 3.5 tonnes84 (5.1%)
  • Goods vehicle over 3.5 tonnes18 (1.1%)
  • Other vehicle12 (0.7%)
  • Bus or coach9 (0.5%)
  • Other6 (0.4%)

Casualties by age

  • 0 to 511 (1%)
  • 6 to 1037 (3.2%)
  • 11 to 1560 (5.3%)
  • 16 to 20249 (22%)
  • 21 to 25144 (13%)
  • 26 to 35200 (18%)
  • 36 to 45133 (12%)
  • 46 to 55115 (10%)
  • 56 to 6558 (5.1%)
  • 66 to 7540 (3.5%)
  • Over 7537 (3.2%)
  • Not recorded56 (4.9%)

Drivers, passengers and pedestrians

  • Driver or rider786 (69%)
  • Passenger254 (22%)
  • Pedestrian100 (8.8%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B377

Map of the 25 most recent crashes on the B377

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

  • 25 crashes
  • Serious
  • Slight

B377 crashes by council area

Collisions on the B377 were recorded in 2 council areas. Spelthorne has the most, with 757, followed by Hounslow (124).

Collisions on the B377 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stSpelthorne7579695115
2ndHounslow124171318

B377 crashes by town

Collisions on the B377 were recorded in 4 towns and built-up areas, led by Ashford, Spelthorne (441) and Laleham (53).

Recent crashes on the B377

These are the 25 most recent collisions on the B377, from 23 April 2023 to 16 December 2025.

Severity