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CrashStats

B478 accidents: crash map and statistics

Police recorded 173 collisions on the B478 from 1979 to 2025, with 225 casualties. Of those crashes, 2 were fatal and 30 serious, and 2 people were killed.

In 2025 there was 1 collision on the B478, down 50% from 2 in 2024, with 1 casualty.

Collisions since 1979
173
3,420th highest of 4,923 roads
Casualties
225
1.30 per collision
Fatal collisions
2
2 people killed
Serious collisions
30
39 seriously injured
Collisions in 2025
1
Down 50% on 2024
Casualties in 2025
1
Down 50% on 2024

Crash severity on the B478

On the B478, 1.2% of collisions were fatal and 17% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal21.2%
  • Serious3017%
  • Slight14182%

Where the B478 ranks among 4,923 roads

Most collisions
3,420th
Most casualties
3,480th
Most fatal collisions
3,485th
Most serious collisions
3,619th

B478 accidents by year

Collisions on the B478 peaked at 10 in 1984 and were down to 1 in 2025.

Collisions and casualties on the B478, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202422
202357
202222
202100
202034
201922
201800
201736
201644
201500
201400
201311
201238
201122
201047
200911
200800
2007910
200611
200533
200444
200357
200233
200124
200066
199922
199845
199722
199634
199511
199422
199323
199213
199155
199067
198978
198855
1987613
198678
198555
19841013
1983914
1982711
198179
1980810
1979810

When crashes happen on the B478

Friday has the most collisions on the B478 (30), and 3pm to 6pm is the busiest time of day (41).

Collisions by day of the week

  • Monday18 (10%)
  • Tuesday23 (13%)
  • Wednesday25 (14%)
  • Thursday25 (14%)
  • Friday30 (17%)
  • Saturday28 (16%)
  • Sunday24 (14%)

Collisions by time of day

  • Midnight to 3am9 (5.2%)
  • 3am to 6am6 (3.5%)
  • 6am to 9am28 (16%)
  • 9am to noon16 (9.2%)
  • Noon to 3pm22 (13%)
  • 3pm to 6pm41 (24%)
  • 6pm to 9pm27 (16%)
  • 9pm to midnight24 (14%)

Collisions by month

  • January9 (5.2%)
  • February15 (8.7%)
  • March14 (8.1%)
  • April16 (9.2%)
  • May16 (9.2%)
  • June19 (11%)
  • July19 (11%)
  • August12 (6.9%)
  • September10 (5.8%)
  • October11 (6.4%)
  • November21 (12%)
  • December11 (6.4%)

Light conditions at the time

  • Daylight115 (66%)
  • Dark, no street lighting45 (26%)
  • Dark, street lights lit12 (6.9%)
  • Dark, street lights unlit1 (0.6%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B478 crashes

On the B478, 56% of collisions happened where the speed limit was 30 mph and 67% on a dry road surface.

Speed limit at the scene

  • 20 mph8 (4.6%)
  • 30 mph97 (56%)
  • 40 mph14 (8.1%)
  • 60 mph54 (31%)

Weather at the time

  • Fine, no high winds139 (80%)
  • Raining, no high winds19 (11%)
  • Raining with high winds4 (2.3%)
  • Fog or mist2 (1.2%)
  • Other9 (5.2%)

Road surface

  • Dry116 (67%)
  • Wet or damp55 (32%)
  • Frost or ice2 (1.2%)

Type of road

  • Single carriageway167 (97%)
  • Roundabout6 (3.5%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B478 crashes

Car occupants make up 61% of the people killed or injured on the B478, followed by motorcyclists (18%).

Casualties by road user

  • Car occupant137 (61%)
  • Motorcyclist40 (18%)
  • Cyclist19 (8.4%)
  • Pedestrian14 (6.2%)
  • Van occupant6 (2.7%)
  • Taxi or private hire car occupant4 (1.8%)
  • Bus or coach occupant3 (1.3%)
  • Other2 (0.9%)

Vehicles involved

  • Car239 (73%)
  • Motorcycle38 (12%)
  • Pedal cycle19 (5.8%)
  • Van or goods vehicle up to 3.5 tonnes18 (5.5%)
  • Goods vehicle over 3.5 tonnes4 (1.2%)
  • Other vehicle2 (0.6%)
  • Other4 (1.2%)
  • Not recorded2 (0.6%)

Casualties by age

  • 6 to 104 (1.8%)
  • 11 to 155 (2.2%)
  • 16 to 2041 (18%)
  • 21 to 2532 (14%)
  • 26 to 3548 (21%)
  • 36 to 4534 (15%)
  • 46 to 5524 (11%)
  • 56 to 6517 (7.6%)
  • 66 to 7514 (6.2%)
  • Over 754 (1.8%)
  • Not recorded2 (0.9%)

Drivers, passengers and pedestrians

  • Driver or rider157 (70%)
  • Passenger54 (24%)
  • Pedestrian14 (6.2%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B478

Map of the 25 most recent crashes on the B478

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B478 crashes by council area

Collisions on the B478 were recorded in 2 council areas. South Oxfordshire has the most, with 106, followed by Wokingham (65).

Collisions on the B478 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stSouth Oxfordshire106138118
2ndWokingham6581111

B478 crashes by town

Of the 173 collisions on the B478, 51 were in the built-up area of Sonning.

Recent crashes on the B478

These are the 25 most recent collisions on the B478, from 5 March 2012 to 28 June 2025.

Severity