Skip to main content
CrashStats

B4020 accidents: crash map and statistics

Police recorded 334 collisions on the B4020 from 1979 to 2025, with 459 casualties. Of those crashes, 7 were fatal and 88 serious, and 7 people were killed.

In 2025 there was 1 collision on the B4020, down 50% from 2 in 2024, with 1 casualty.

Collisions since 1979
334
2,544th highest of 4,923 roads
Casualties
459
1.37 per collision
Fatal collisions
7
7 people killed
Serious collisions
88
105 seriously injured
Collisions in 2025
1
Down 50% on 2024
Casualties in 2025
1
Down 50% on 2024

Crash severity on the B4020

On the B4020, 2.1% of collisions were fatal and 26% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal72.1%
  • Serious8826%
  • Slight23972%

Where the B4020 ranks among 4,923 roads

Most collisions
2,544th
Most casualties
2,532nd
Most fatal collisions
2,103rd
Most serious collisions
2,122nd

B4020 accidents by year

Collisions on the B4020 peaked at 19 in 1987 and were down to 1 in 2025.

Collisions and casualties on the B4020, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202422
202322
202279
202134
202046
201911
201855
201722
201656
201547
201433
201323
2012710
201135
201013
200945
200867
200748
2006916
200535
200467
2003713
2002814
200167
20001523
1999910
19981318
19971014
199647
1995911
199478
199335
199248
1991913
1990913
19891519
198877
19871923
19861112
19851112
1984910
19831220
19821520
19811829
19801113
1979913

When crashes happen on the B4020

Thursday has the most collisions on the B4020 (61), and 3pm to 6pm is the busiest time of day (74).

Collisions by day of the week

  • Monday51 (15%)
  • Tuesday48 (14%)
  • Wednesday30 (9%)
  • Thursday61 (18%)
  • Friday52 (16%)
  • Saturday58 (17%)
  • Sunday34 (10%)

Collisions by time of day

  • Midnight to 3am12 (3.6%)
  • 3am to 6am7 (2.1%)
  • 6am to 9am50 (15%)
  • 9am to noon35 (10%)
  • Noon to 3pm59 (18%)
  • 3pm to 6pm74 (22%)
  • 6pm to 9pm55 (16%)
  • 9pm to midnight42 (13%)

Collisions by month

  • January33 (9.9%)
  • February26 (7.8%)
  • March26 (7.8%)
  • April21 (6.3%)
  • May25 (7.5%)
  • June26 (7.8%)
  • July24 (7.2%)
  • August29 (8.7%)
  • September21 (6.3%)
  • October31 (9.3%)
  • November36 (11%)
  • December36 (11%)

Light conditions at the time

  • Daylight218 (65%)
  • Dark, no street lighting68 (20%)
  • Dark, street lights lit45 (13%)
  • Dark, street lights unlit2 (0.6%)
  • Dark, lighting unknown1 (0.3%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4020 crashes

On the B4020, 52% of collisions happened where the speed limit was 60 mph and 58% on a dry road surface.

Speed limit at the scene

  • 20 mph1 (0.3%)
  • 30 mph128 (38%)
  • 40 mph30 (9%)
  • 60 mph175 (52%)

Weather at the time

  • Fine, no high winds253 (76%)
  • Raining, no high winds50 (15%)
  • Fog or mist6 (1.8%)
  • Fine with high winds5 (1.5%)
  • Other19 (5.7%)
  • Not recorded1 (0.3%)

Road surface

  • Dry193 (58%)
  • Wet or damp130 (39%)
  • Frost or ice9 (2.7%)
  • Snow2 (0.6%)

Type of road

  • Single carriageway302 (90%)
  • Roundabout31 (9.3%)
  • One way street or slip road1 (0.3%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4020 crashes

Car occupants make up 63% of the people killed or injured on the B4020, followed by motorcyclists (16%).

Casualties by road user

  • Car occupant288 (63%)
  • Motorcyclist75 (16%)
  • Pedestrian42 (9.2%)
  • Cyclist41 (8.9%)
  • Van occupant8 (1.7%)
  • Goods vehicle occupant (over 3.5 tonnes)2 (0.4%)
  • Other vehicle occupant2 (0.4%)
  • Taxi or private hire car occupant1 (0.2%)

Vehicles involved

  • Car423 (72%)
  • Motorcycle73 (12%)
  • Pedal cycle43 (7.3%)
  • Van or goods vehicle up to 3.5 tonnes23 (3.9%)
  • Goods vehicle over 3.5 tonnes13 (2.2%)
  • Bus or coach4 (0.7%)
  • Other vehicle4 (0.7%)
  • Other6 (1%)

Casualties by age

  • 0 to 55 (1.1%)
  • 6 to 1015 (3.3%)
  • 11 to 1537 (8.1%)
  • 16 to 2085 (19%)
  • 21 to 2584 (18%)
  • 26 to 3578 (17%)
  • 36 to 4554 (12%)
  • 46 to 5529 (6.3%)
  • 56 to 6531 (6.8%)
  • 66 to 7516 (3.5%)
  • Over 758 (1.7%)
  • Not recorded17 (3.7%)

Drivers, passengers and pedestrians

  • Driver or rider320 (70%)
  • Passenger97 (21%)
  • Pedestrian42 (9.2%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4020

Map of the 25 most recent crashes on the B4020

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

  • 25 crashes
  • Serious
  • Slight

B4020 crashes by council area

Collisions on the B4020 were recorded in 2 council areas. West Oxfordshire has the most, with 330, followed by Ealing (3).

Collisions on the B4020 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stWest Oxfordshire330454787
2ndEaling3401

B4020 crashes by town

Collisions on the B4020 were recorded in 2 towns and built-up areas, led by Carterton (125) and Burford (5).

Recent crashes on the B4020

These are the 25 most recent collisions on the B4020, from 12 March 2018 to 28 November 2025.

Severity