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CrashStats

B378 accidents: crash map and statistics

Police recorded 1,234 collisions on the B378 from 1979 to 2025, with 1,503 casualties. Of those crashes, 6 were fatal and 185 serious, and 7 people were killed.

In 2025 there were 13 collisions on the B378, up 18% from 11 in 2024, with 15 casualties.

Collisions since 1979
1,234
889th highest of 4,923 roads
Casualties
1,503
1.22 per collision
Fatal collisions
6
7 people killed
Serious collisions
185
193 seriously injured
Collisions in 2025
13
Up 18% on 2024
Casualties in 2025
15
Up 7% on 2024

Crash severity on the B378

On the B378, 0.5% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal60.5%
  • Serious18515%
  • Slight1,04385%

Where the B378 ranks among 4,923 roads

Most collisions
889th
Most casualties
991st
Most fatal collisions
2,299th
Most serious collisions
1,137th

B378 accidents by year

Collisions on the B378 peaked at 54 in 1984 and were down to 13 in 2025.

Collisions and casualties on the B378, 1979 to 2025

  • Collisions
  • Collisions in 2025: 13
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251315
20241114
20231922
20221116
20211213
20201415
20191112
20181113
20171420
20162326
20152934
20141422
20131623
20122427
20112531
20102127
20092332
20082837
20072434
20062531
20053341
20042024
20033036
20023038
20012530
20001516
19992122
19982323
19973543
19962328
19952536
19943138
19932128
19922426
19912529
19902023
19892937
19883740
19873035
19864450
19854758
19845458
19834856
19824048
19814456
19803948
19795372

When crashes happen on the B378

Friday has the most collisions on the B378 (230), and 3pm to 6pm is the busiest time of day (296).

Collisions by day of the week

  • Monday183 (15%)
  • Tuesday207 (17%)
  • Wednesday149 (12%)
  • Thursday201 (16%)
  • Friday230 (19%)
  • Saturday156 (13%)
  • Sunday108 (8.8%)

Collisions by time of day

  • Midnight to 3am38 (3.1%)
  • 3am to 6am11 (0.9%)
  • 6am to 9am165 (13%)
  • 9am to noon179 (15%)
  • Noon to 3pm220 (18%)
  • 3pm to 6pm296 (24%)
  • 6pm to 9pm221 (18%)
  • 9pm to midnight104 (8.4%)

Collisions by month

  • January88 (7.1%)
  • February95 (7.7%)
  • March118 (9.6%)
  • April86 (7%)
  • May104 (8.4%)
  • June107 (8.7%)
  • July91 (7.4%)
  • August79 (6.4%)
  • September105 (8.5%)
  • October121 (9.8%)
  • November135 (11%)
  • December105 (8.5%)

Light conditions at the time

  • Daylight866 (70%)
  • Dark, street lights lit338 (27%)
  • Dark, lighting unknown21 (1.7%)
  • Dark, street lights unlit8 (0.6%)
  • Dark, no street lighting1 (0.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B378 crashes

On the B378, 97% of collisions happened where the speed limit was 30 mph and 72% on a dry road surface.

Speed limit at the scene

  • 20 mph5 (0.4%)
  • 30 mph1,196 (97%)
  • 40 mph27 (2.2%)
  • 50 mph1 (0.1%)
  • 60 mph5 (0.4%)

Weather at the time

  • Fine, no high winds874 (71%)
  • Raining, no high winds157 (13%)
  • Fine with high winds24 (1.9%)
  • Raining with high winds12 (1%)
  • Other147 (12%)
  • Not recorded20 (1.6%)

Road surface

  • Dry889 (72%)
  • Wet or damp326 (26%)
  • Frost or ice10 (0.8%)
  • Snow7 (0.6%)
  • Not recorded2 (0.2%)

Type of road

  • Single carriageway1,022 (83%)
  • Dual carriageway84 (6.8%)
  • Roundabout38 (3.1%)
  • One way street or slip road16 (1.3%)
  • Not recorded74 (6%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B378 crashes

Car occupants make up 47% of the people killed or injured on the B378, followed by pedestrians (18%).

Casualties by road user

  • Car occupant708 (47%)
  • Pedestrian270 (18%)
  • Motorcyclist235 (16%)
  • Cyclist219 (15%)
  • Van occupant32 (2.1%)
  • Bus or coach occupant25 (1.7%)
  • Other12 (0.8%)
  • Not recorded2 (0.1%)

Vehicles involved

  • Car1,498 (69%)
  • Motorcycle252 (12%)
  • Pedal cycle229 (11%)
  • Van or goods vehicle up to 3.5 tonnes104 (4.8%)
  • Bus or coach36 (1.7%)
  • Other vehicle26 (1.2%)
  • Goods vehicle over 3.5 tonnes20 (0.9%)
  • Other7 (0.3%)

Casualties by age

  • 0 to 526 (1.7%)
  • 6 to 1051 (3.4%)
  • 11 to 15137 (9.1%)
  • 16 to 20342 (23%)
  • 21 to 25172 (11%)
  • 26 to 35224 (15%)
  • 36 to 45165 (11%)
  • 46 to 55122 (8.1%)
  • 56 to 6588 (5.9%)
  • 66 to 7551 (3.4%)
  • Over 7548 (3.2%)
  • Not recorded77 (5.1%)

Drivers, passengers and pedestrians

  • Driver or rider987 (66%)
  • Pedestrian270 (18%)
  • Passenger246 (16%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B378

Map of the 25 most recent crashes on the B378

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

  • 25 crashes
  • Serious
  • Slight

B378 crashes by council area

Of the 1,234 collisions on the B378, 1,232 were in Spelthorne.

Collisions on the B378 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stSpelthorne1,2321,5016184

B378 crashes by town

Collisions on the B378 were recorded in 3 towns and built-up areas, led by Ashford, Spelthorne (769) and Stanwell (130).

Recent crashes on the B378

These are the 25 most recent collisions on the B378, from 9 December 2023 to 17 December 2025.

Severity