Skip to main content
CrashStats

B4009 accidents: crash map and statistics

Police recorded 2,077 collisions on the B4009 from 1979 to 2025, with 2,996 casualties. Of those crashes, 49 were fatal and 444 serious, and 50 people were killed.

In 2025 there were 13 collisions on the B4009, down 32% from 19 in 2024, with 16 casualties.

Collisions since 1979
2,077
559th highest of 4,923 roads
Casualties
2,996
1.44 per collision
Fatal collisions
49
50 people killed
Serious collisions
444
577 seriously injured
Collisions in 2025
13
Down 32% on 2024
Casualties in 2025
16
Down 41% on 2024

Crash severity on the B4009

On the B4009, 2.4% of collisions were fatal and 21% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal492.4%
  • Serious44421%
  • Slight1,58476%

Where the B4009 ranks among 4,923 roads

Most collisions
559th
Most casualties
537th
Most fatal collisions
422nd
Most serious collisions
483rd

B4009 accidents by year

Collisions on the B4009 peaked at 72 in 1997 and were down to 13 in 2025.

Collisions and casualties on the B4009, 1979 to 2025

  • Collisions
  • Collisions in 2025: 13
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251316
20241927
20231922
20221720
20211521
20201320
20191930
20181926
20172434
20163555
20153551
20143653
20133749
20124057
20114058
20103346
20093545
20084256
20075183
20065791
20054567
20046179
20036082
20025795
20015065
20004154
19996788
19986393
199772113
19965785
19956097
19945568
19936091
19926594
199168102
19905266
19893348
19886494
19874675
19865472
19854668
19845577
19834460
19825279
19815571
19804479
19795274

When crashes happen on the B4009

Friday has the most collisions on the B4009 (353), and 3pm to 6pm is the busiest time of day (461).

Collisions by day of the week

  • Monday264 (13%)
  • Tuesday284 (14%)
  • Wednesday311 (15%)
  • Thursday338 (16%)
  • Friday353 (17%)
  • Saturday267 (13%)
  • Sunday260 (13%)

Collisions by time of day

  • Midnight to 3am85 (4.1%)
  • 3am to 6am28 (1.3%)
  • 6am to 9am365 (18%)
  • 9am to noon263 (13%)
  • Noon to 3pm306 (15%)
  • 3pm to 6pm461 (22%)
  • 6pm to 9pm348 (17%)
  • 9pm to midnight221 (11%)

Collisions by month

  • January167 (8%)
  • February169 (8.1%)
  • March153 (7.4%)
  • April155 (7.5%)
  • May185 (8.9%)
  • June175 (8.4%)
  • July193 (9.3%)
  • August144 (6.9%)
  • September166 (8%)
  • October188 (9.1%)
  • November197 (9.5%)
  • December185 (8.9%)

Light conditions at the time

  • Daylight1,415 (68%)
  • Dark, no street lighting456 (22%)
  • Dark, street lights lit173 (8.3%)
  • Dark, lighting unknown22 (1.1%)
  • Dark, street lights unlit9 (0.4%)
  • Not recorded2 (0.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4009 crashes

On the B4009, 44% of collisions happened where the speed limit was 60 mph and 57% on a dry road surface.

Speed limit at the scene

  • 20 mph11 (0.5%)
  • 30 mph700 (34%)
  • 40 mph186 (9%)
  • 50 mph254 (12%)
  • 60 mph923 (44%)
  • Not recorded3 (0.1%)

Weather at the time

  • Fine, no high winds1,598 (77%)
  • Raining, no high winds268 (13%)
  • Fine with high winds37 (1.8%)
  • Raining with high winds34 (1.6%)
  • Other122 (5.9%)
  • Not recorded18 (0.9%)

Road surface

  • Dry1,194 (57%)
  • Wet or damp785 (38%)
  • Frost or ice68 (3.3%)
  • Snow16 (0.8%)
  • Other9 (0.4%)
  • Not recorded5 (0.2%)

Type of road

  • Single carriageway1,993 (96%)
  • Roundabout62 (3%)
  • Dual carriageway15 (0.7%)
  • One way street or slip road6 (0.3%)
  • Not recorded1 (under 0.1%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4009 crashes

Car occupants make up 73% of the people killed or injured on the B4009, followed by motorcyclists (11%).

Casualties by road user

  • Car occupant2,179 (73%)
  • Motorcyclist324 (11%)
  • Pedestrian187 (6.2%)
  • Cyclist164 (5.5%)
  • Van occupant77 (2.6%)
  • Bus or coach occupant20 (0.7%)
  • Goods vehicle occupant (over 3.5 tonnes)17 (0.6%)
  • Other28 (0.9%)

Vehicles involved

  • Car2,970 (76%)
  • Motorcycle329 (8.5%)
  • Van or goods vehicle up to 3.5 tonnes205 (5.3%)
  • Pedal cycle173 (4.4%)
  • Goods vehicle over 3.5 tonnes106 (2.7%)
  • Other vehicle39 (1%)
  • Other62 (1.6%)
  • Not recorded5 (0.1%)

Casualties by age

  • 0 to 556 (1.9%)
  • 6 to 1088 (2.9%)
  • 11 to 15152 (5.1%)
  • 16 to 20576 (19%)
  • 21 to 25352 (12%)
  • 26 to 35543 (18%)
  • 36 to 45430 (14%)
  • 46 to 55327 (11%)
  • 56 to 65193 (6.4%)
  • 66 to 75112 (3.7%)
  • Over 7579 (2.6%)
  • Not recorded88 (2.9%)

Drivers, passengers and pedestrians

  • Driver or rider2,103 (70%)
  • Passenger706 (24%)
  • Pedestrian187 (6.2%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4009

Map of the 25 most recent crashes on the B4009

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

  • 25 crashes
  • Serious
  • Slight

B4009 crashes by council area

Collisions on the B4009 were recorded in 3 council areas. South Oxfordshire has the most, with 1,054, followed by Buckinghamshire (537) and West Berkshire (484).

Collisions on the B4009 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stSouth Oxfordshire1,0541,55921241
2ndBuckinghamshire53776017108
3rdWest Berkshire4846721195

B4009 crashes by town

Collisions on the B4009 were recorded in 9 towns and built-up areas, led by Chinnor (184) and Hermitage (77).

Recent crashes on the B4009

These are the 25 most recent collisions on the B4009, from 26 May 2024 to 31 December 2025.

Severity