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CrashStats

A4156 accidents: crash map and statistics

Police recorded 135 collisions on the A4156 from 1979 to 2024, with 157 casualties. Of those crashes, 2 were fatal and 23 serious, and 2 people were killed.

No collisions were recorded on the A4156 in 2025, after 3 in 2024.

Collisions since 1979
135
3,721st highest of 4,923 roads
Casualties
157
1.16 per collision
Fatal collisions
2
2 people killed
Serious collisions
23
23 seriously injured
Collisions in 2025
0
3 in 2024
Casualties in 2025
0
3 in 2024

Crash severity on the A4156

On the A4156, 1.5% of collisions were fatal and 17% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2024

  • Fatal21.5%
  • Serious2317%
  • Slight11081%

Where the A4156 ranks among 4,923 roads

Most collisions
3,721st
Most casualties
3,875th
Most fatal collisions
3,485th
Most serious collisions
3,899th

A4156 accidents by year

Collisions on the A4156 peaked at 8 in 1988; none were recorded in 2025.

Collisions and casualties on the A4156, 1979 to 2025

  • Collisions
  • Collisions in 2025
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202500
202433
202300
202211
202122
202011
201912
201800
201700
201623
201522
201433
201311
201222
201111
201011
200911
200833
200744
200611
200533
200445
200334
200233
200156
200022
199933
199856
1997511
199644
199522
199423
199333
199245
199167
199033
198944
1988813
198766
198644
198522
198466
198311
198277
198157
198022
197944

When crashes happen on the A4156

Friday has the most collisions on the A4156 (28), and 3pm to 6pm is the busiest time of day (35).

Collisions by day of the week

  • Monday16 (12%)
  • Tuesday23 (17%)
  • Wednesday22 (16%)
  • Thursday22 (16%)
  • Friday28 (21%)
  • Saturday13 (9.6%)
  • Sunday11 (8.1%)

Collisions by time of day

  • Midnight to 3am3 (2.2%)
  • 3am to 6am2 (1.5%)
  • 6am to 9am19 (14%)
  • 9am to noon23 (17%)
  • Noon to 3pm24 (18%)
  • 3pm to 6pm35 (26%)
  • 6pm to 9pm17 (13%)
  • 9pm to midnight12 (8.9%)

Collisions by month

  • January16 (12%)
  • February9 (6.7%)
  • March14 (10%)
  • April10 (7.4%)
  • May11 (8.1%)
  • June11 (8.1%)
  • July5 (3.7%)
  • August6 (4.4%)
  • September12 (8.9%)
  • October13 (9.6%)
  • November13 (9.6%)
  • December15 (11%)

Light conditions at the time

  • Daylight100 (74%)
  • Dark, street lights lit33 (24%)
  • Dark, lighting unknown1 (0.7%)
  • Dark, no street lighting1 (0.7%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4156 crashes

On the A4156, 98% of collisions happened where the speed limit was 30 mph and 67% on a dry road surface.

Speed limit at the scene

  • 30 mph132 (98%)
  • 40 mph1 (0.7%)
  • 60 mph2 (1.5%)

Weather at the time

  • Fine, no high winds113 (84%)
  • Raining, no high winds14 (10%)
  • Fog or mist3 (2.2%)
  • Fine with high winds1 (0.7%)
  • Raining with high winds1 (0.7%)
  • Other3 (2.2%)

Road surface

  • Dry91 (67%)
  • Wet or damp43 (32%)
  • Frost or ice1 (0.7%)

Type of road

  • Single carriageway72 (53%)
  • Roundabout42 (31%)
  • Dual carriageway21 (16%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4156 crashes

Car occupants make up 46% of the people killed or injured on the A4156, followed by pedestrians (24%).

Casualties by road user

  • Car occupant72 (46%)
  • Pedestrian37 (24%)
  • Cyclist24 (15%)
  • Motorcyclist17 (11%)
  • Van occupant4 (2.5%)
  • Bus or coach occupant2 (1.3%)
  • Taxi or private hire car occupant1 (0.6%)

Vehicles involved

  • Car177 (72%)
  • Pedal cycle24 (9.8%)
  • Motorcycle17 (6.9%)
  • Van or goods vehicle up to 3.5 tonnes13 (5.3%)
  • Bus or coach6 (2.4%)
  • Goods vehicle over 3.5 tonnes4 (1.6%)
  • Other2 (0.8%)
  • Not recorded3 (1.2%)

Casualties by age

  • 0 to 57 (4.5%)
  • 6 to 102 (1.3%)
  • 11 to 1512 (7.6%)
  • 16 to 2034 (22%)
  • 21 to 2520 (13%)
  • 26 to 3524 (15%)
  • 36 to 4514 (8.9%)
  • 46 to 5511 (7%)
  • 56 to 6511 (7%)
  • 66 to 7511 (7%)
  • Over 757 (4.5%)
  • Not recorded4 (2.5%)

Drivers, passengers and pedestrians

  • Driver or rider90 (57%)
  • Pedestrian37 (24%)
  • Passenger30 (19%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4156

Map of the 25 most recent crashes on the A4156

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

  • 25 crashes
  • Serious
  • Slight

A4156 crashes by council area

Of the 135 collisions on the A4156, 132 were in Buckinghamshire.

Collisions on the A4156 in each area, 1979 to 2024
RankAreaCollisionsCasualtiesFatalSerious
1stBuckinghamshire132153223

A4156 crashes by town

Of the 135 collisions on the A4156, 132 were in the built-up area of Aylesbury.

Recent crashes on the A4156

These are the 25 most recent collisions on the A4156, from 6 December 2007 to 23 October 2024.

Severity