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CrashStats

B3378 accidents: crash map and statistics

Police recorded 135 collisions on the B3378 from 1979 to 2025, with 162 casualties. Of those crashes, 1 was fatal and 21 serious, and 1 person was killed.

In 2025 there was 1 collision on the B3378, up from none in 2024, with 1 casualty.

Collisions since 1979
135
3,721st highest of 4,923 roads
Casualties
162
1.20 per collision
Fatal collisions
1
1 person killed
Serious collisions
21
21 seriously injured
Collisions in 2025
1
Up from none in 2024
Casualties in 2025
1
Up from none in 2024

Crash severity on the B3378

On the B3378, 0.7% of collisions were fatal and 16% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal10.7%
  • Serious2116%
  • Slight11384%

Where the B3378 ranks among 4,923 roads

Most collisions
3,721st
Most casualties
3,852nd
Most fatal collisions
3,933rd
Most serious collisions
3,992nd

B3378 accidents by year

Collisions on the B3378 peaked at 11 in 1984 and were down to 1 in 2025.

Collisions and casualties on the B3378, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202400
202300
202211
202133
202023
201900
201833
201700
201611
201500
201434
201344
201223
201122
201012
200911
200800
200711
200667
200534
200411
200312
200233
200135
200056
199924
199800
199711
199622
199534
199411
199311
199211
199111
199011
198922
198868
198700
198644
19851011
19841112
198344
198277
19811013
19801117
19791011

When crashes happen on the B3378

Wednesday has the most collisions on the B3378 (31), and noon to 3pm is the busiest time of day (27).

Collisions by day of the week

  • Monday15 (11%)
  • Tuesday19 (14%)
  • Wednesday31 (23%)
  • Thursday23 (17%)
  • Friday20 (15%)
  • Saturday16 (12%)
  • Sunday11 (8.1%)

Collisions by time of day

  • Midnight to 3am7 (5.2%)
  • 3am to 6am1 (0.7%)
  • 6am to 9am21 (16%)
  • 9am to noon15 (11%)
  • Noon to 3pm27 (20%)
  • 3pm to 6pm27 (20%)
  • 6pm to 9pm22 (16%)
  • 9pm to midnight15 (11%)

Collisions by month

  • January8 (5.9%)
  • February11 (8.1%)
  • March13 (9.6%)
  • April15 (11%)
  • May8 (5.9%)
  • June15 (11%)
  • July10 (7.4%)
  • August14 (10%)
  • September9 (6.7%)
  • October13 (9.6%)
  • November15 (11%)
  • December4 (3%)

Light conditions at the time

  • Daylight98 (73%)
  • Dark, street lights lit35 (26%)
  • Dark, lighting unknown2 (1.5%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B3378 crashes

On the B3378, 79% of collisions happened where the speed limit was 30 mph and 74% on a dry road surface.

Speed limit at the scene

  • 30 mph107 (79%)
  • 40 mph8 (5.9%)
  • 50 mph4 (3%)
  • 60 mph10 (7.4%)
  • 70 mph6 (4.4%)

Weather at the time

  • Fine, no high winds90 (67%)
  • Raining, no high winds12 (8.9%)
  • Fine with high winds4 (3%)
  • Raining with high winds3 (2.2%)
  • Other26 (19%)

Road surface

  • Dry100 (74%)
  • Wet or damp27 (20%)
  • Frost or ice5 (3.7%)
  • Flood over 3cm deep2 (1.5%)
  • Not recorded1 (0.7%)

Type of road

  • Single carriageway99 (73%)
  • Dual carriageway16 (12%)
  • Roundabout11 (8.1%)
  • One way street or slip road2 (1.5%)
  • Not recorded7 (5.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B3378 crashes

Car occupants make up 53% of the people killed or injured on the B3378, followed by motorcyclists (18%).

Casualties by road user

  • Car occupant86 (53%)
  • Motorcyclist29 (18%)
  • Cyclist14 (8.6%)
  • Pedestrian14 (8.6%)
  • Van occupant9 (5.6%)
  • Goods vehicle occupant (over 3.5 tonnes)5 (3.1%)
  • Bus or coach occupant4 (2.5%)
  • Minibus occupant1 (0.6%)

Vehicles involved

  • Car164 (65%)
  • Motorcycle30 (12%)
  • Van or goods vehicle up to 3.5 tonnes25 (9.9%)
  • Pedal cycle14 (5.5%)
  • Goods vehicle over 3.5 tonnes10 (4%)
  • Bus or coach8 (3.2%)
  • Goods vehicle, weight unknown1 (0.4%)
  • Minibus1 (0.4%)

Casualties by age

  • 0 to 55 (3.1%)
  • 6 to 105 (3.1%)
  • 11 to 155 (3.1%)
  • 16 to 2027 (17%)
  • 21 to 2519 (12%)
  • 26 to 3537 (23%)
  • 36 to 4523 (14%)
  • 46 to 5521 (13%)
  • 56 to 659 (5.6%)
  • 66 to 754 (2.5%)
  • Over 752 (1.2%)
  • Not recorded5 (3.1%)

Drivers, passengers and pedestrians

  • Driver or rider118 (73%)
  • Passenger30 (19%)
  • Pedestrian14 (8.6%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B3378

Map of the 25 most recent crashes on the B3378

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

  • 25 crashes
  • Serious
  • Slight

B3378 crashes by council area

Collisions on the B3378 were recorded in 4 council areas. Hillingdon has the most, with 98, followed by Spelthorne (23) and Slough (9).

Collisions on the B3378 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stHillingdon98116112
2ndSpelthorne233006
3rdSlough91001
4thBuckinghamshire4502

B3378 crashes by town

Collisions on the B3378 were recorded in 4 towns and built-up areas, led by Hillingdon (44) and Poyle (14).

Recent crashes on the B3378

These are the 25 most recent collisions on the B3378, from 15 November 2007 to 19 July 2025.

Severity