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CrashStats

B4011 accidents: crash map and statistics

Police recorded 597 collisions on the B4011 from 1979 to 2025, with 863 casualties. Of those crashes, 24 were fatal and 160 serious, and 26 people were killed.

In 2025 there were 7 collisions on the B4011, level with 2024, with 7 casualties.

Collisions since 1979
597
1,698th highest of 4,923 roads
Casualties
863
1.45 per collision
Fatal collisions
24
26 people killed
Serious collisions
160
205 seriously injured
Collisions in 2025
7
Level with 2024
Casualties in 2025
7
Down 36% on 2024

Crash severity on the B4011

On the B4011, 4% of collisions were fatal and 27% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal244%
  • Serious16027%
  • Slight41369%

Where the B4011 ranks among 4,923 roads

Most collisions
1,698th
Most casualties
1,617th
Most fatal collisions
836th
Most serious collisions
1,297th

B4011 accidents by year

Collisions on the B4011 peaked at 31 in 1990 and were down to 7 in 2025.

Collisions and casualties on the B4011, 1979 to 2025

  • Collisions
  • Collisions in 2025: 7
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202577
2024711
202333
202233
202144
2020713
201944
201869
201734
201699
20151017
20141320
201359
20121113
20111212
2010911
20091724
200867
20071317
20061931
20051219
20041928
20032230
20021719
20012338
20002027
19991621
19982029
19971012
19961625
19951121
19941935
19931118
19921727
19911116
19903144
19892024
19881622
19871730
19861825
19851011
19841931
19831522
19821329
198167
19801316
197979

When crashes happen on the B4011

Saturday has the most collisions on the B4011 (104), and 3pm to 6pm is the busiest time of day (119).

Collisions by day of the week

  • Monday72 (12%)
  • Tuesday84 (14%)
  • Wednesday77 (13%)
  • Thursday86 (14%)
  • Friday96 (16%)
  • Saturday104 (17%)
  • Sunday78 (13%)

Collisions by time of day

  • Midnight to 3am19 (3.2%)
  • 3am to 6am13 (2.2%)
  • 6am to 9am105 (18%)
  • 9am to noon97 (16%)
  • Noon to 3pm77 (13%)
  • 3pm to 6pm119 (20%)
  • 6pm to 9pm109 (18%)
  • 9pm to midnight58 (9.7%)

Collisions by month

  • January42 (7%)
  • February42 (7%)
  • March57 (9.5%)
  • April41 (6.9%)
  • May55 (9.2%)
  • June31 (5.2%)
  • July49 (8.2%)
  • August53 (8.9%)
  • September53 (8.9%)
  • October66 (11%)
  • November51 (8.5%)
  • December57 (9.5%)

Light conditions at the time

  • Daylight424 (71%)
  • Dark, no street lighting145 (24%)
  • Dark, street lights lit21 (3.5%)
  • Dark, lighting unknown6 (1%)
  • Not recorded1 (0.2%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4011 crashes

On the B4011, 73% of collisions happened where the speed limit was 60 mph and 58% on a dry road surface.

Speed limit at the scene

  • 30 mph92 (15%)
  • 40 mph4 (0.7%)
  • 50 mph68 (11%)
  • 60 mph433 (73%)

Weather at the time

  • Fine, no high winds477 (80%)
  • Raining, no high winds65 (11%)
  • Fine with high winds14 (2.3%)
  • Fog or mist10 (1.7%)
  • Raining with high winds9 (1.5%)
  • Other22 (3.7%)

Road surface

  • Dry346 (58%)
  • Wet or damp207 (35%)
  • Frost or ice35 (5.9%)
  • Flood over 3cm deep4 (0.7%)
  • Snow4 (0.7%)
  • Not recorded1 (0.2%)

Type of road

  • Single carriageway585 (98%)
  • Roundabout4 (0.7%)
  • Dual carriageway3 (0.5%)
  • One way street or slip road1 (0.2%)
  • Not recorded4 (0.7%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4011 crashes

Car occupants make up 73% of the people killed or injured on the B4011, followed by motorcyclists (14%).

Casualties by road user

  • Car occupant627 (73%)
  • Motorcyclist120 (14%)
  • Van occupant27 (3.1%)
  • Pedestrian26 (3%)
  • Cyclist24 (2.8%)
  • Goods vehicle occupant (over 3.5 tonnes)14 (1.6%)
  • Other24 (2.8%)
  • Not recorded1 (0.1%)

Vehicles involved

  • Car745 (74%)
  • Motorcycle116 (12%)
  • Van or goods vehicle up to 3.5 tonnes47 (4.7%)
  • Goods vehicle over 3.5 tonnes38 (3.8%)
  • Pedal cycle25 (2.5%)
  • Other vehicle20 (2%)
  • Other12 (1.2%)
  • Not recorded2 (0.2%)

Casualties by age

  • 0 to 512 (1.4%)
  • 6 to 1020 (2.3%)
  • 11 to 1520 (2.3%)
  • 16 to 20161 (19%)
  • 21 to 25144 (17%)
  • 26 to 35206 (24%)
  • 36 to 45110 (13%)
  • 46 to 5579 (9.2%)
  • 56 to 6551 (5.9%)
  • 66 to 7525 (2.9%)
  • Over 7522 (2.5%)
  • Not recorded13 (1.5%)

Drivers, passengers and pedestrians

  • Driver or rider644 (75%)
  • Passenger193 (22%)
  • Pedestrian26 (3%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4011

Map of the 25 most recent crashes on the B4011

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B4011 crashes by council area

Collisions on the B4011 were recorded in 3 council areas. Buckinghamshire has the most, with 365, followed by Cherwell (217) and South Oxfordshire (15).

Collisions on the B4011 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stBuckinghamshire3655081298
2ndCherwell2173371261
3rdSouth Oxfordshire151801

B4011 crashes by town

Of the 597 collisions on the B4011, 64 were in the built-up area of Long Crendon.

Recent crashes on the B4011

These are the 25 most recent collisions on the B4011, from 8 December 2020 to 28 November 2025.

Severity