Skip to main content
CrashStats

A4129 accidents: crash map and statistics

Police recorded 466 collisions on the A4129 from 1979 to 2025, with 670 casualties. Of those crashes, 11 were fatal and 83 serious, and 12 people were killed.

In 2025 there were 5 collisions on the A4129, up 67% from 3 in 2024, with 6 casualties.

Collisions since 1979
466
2,076th highest of 4,923 roads
Casualties
670
1.44 per collision
Fatal collisions
11
12 people killed
Serious collisions
83
106 seriously injured
Collisions in 2025
5
Up 67% on 2024
Casualties in 2025
6
Down 14% on 2024

Crash severity on the A4129

On the A4129, 2.4% of collisions were fatal and 18% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal112.4%
  • Serious8318%
  • Slight37280%

Where the A4129 ranks among 4,923 roads

Most collisions
2,076th
Most casualties
1,982nd
Most fatal collisions
1,595th
Most serious collisions
2,219th

A4129 accidents by year

Collisions on the A4129 peaked at 20 in 2001 and were down to 5 in 2025.

Collisions and casualties on the A4129, 1979 to 2025

  • Collisions
  • Collisions in 2025: 5
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202556
202437
202389
2022612
202133
202033
201969
2018717
201766
201646
201579
201446
201347
2012611
20111116
2010913
20091318
2008913
20071119
20061119
200578
200446
20031417
20021322
20012027
20001424
19991928
19981417
19971525
19961523
19951519
19941621
19931523
19921010
19911012
199079
19891117
1988710
19871219
19861320
1985910
1984811
19831114
19821114
19811626
19801112
19791317

When crashes happen on the A4129

Friday has the most collisions on the A4129 (78), and 3pm to 6pm is the busiest time of day (109).

Collisions by day of the week

  • Monday70 (15%)
  • Tuesday64 (14%)
  • Wednesday63 (14%)
  • Thursday72 (15%)
  • Friday78 (17%)
  • Saturday59 (13%)
  • Sunday60 (13%)

Collisions by time of day

  • Midnight to 3am12 (2.6%)
  • 3am to 6am7 (1.5%)
  • 6am to 9am94 (20%)
  • 9am to noon69 (15%)
  • Noon to 3pm66 (14%)
  • 3pm to 6pm109 (23%)
  • 6pm to 9pm75 (16%)
  • 9pm to midnight34 (7.3%)

Collisions by month

  • January40 (8.6%)
  • February32 (6.9%)
  • March42 (9%)
  • April47 (10%)
  • May40 (8.6%)
  • June35 (7.5%)
  • July36 (7.7%)
  • August30 (6.4%)
  • September35 (7.5%)
  • October40 (8.6%)
  • November42 (9%)
  • December47 (10%)

Light conditions at the time

  • Daylight350 (75%)
  • Dark, no street lighting59 (13%)
  • Dark, street lights lit48 (10%)
  • Dark, lighting unknown8 (1.7%)
  • Dark, street lights unlit1 (0.2%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4129 crashes

On the A4129, 45% of collisions happened where the speed limit was 60 mph and 60% on a dry road surface.

Speed limit at the scene

  • 30 mph108 (23%)
  • 40 mph96 (21%)
  • 50 mph54 (12%)
  • 60 mph208 (45%)

Weather at the time

  • Fine, no high winds363 (78%)
  • Raining, no high winds55 (12%)
  • Fine with high winds14 (3%)
  • Raining with high winds9 (1.9%)
  • Other22 (4.7%)
  • Not recorded3 (0.6%)

Road surface

  • Dry280 (60%)
  • Wet or damp166 (36%)
  • Frost or ice11 (2.4%)
  • Snow4 (0.9%)
  • Flood over 3cm deep1 (0.2%)
  • Not recorded4 (0.9%)

Type of road

  • Single carriageway406 (87%)
  • Roundabout54 (12%)
  • Dual carriageway3 (0.6%)
  • Not recorded3 (0.6%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4129 crashes

Car occupants make up 76% of the people killed or injured on the A4129, followed by motorcyclists (9.7%).

Casualties by road user

  • Car occupant508 (76%)
  • Motorcyclist65 (9.7%)
  • Cyclist43 (6.4%)
  • Pedestrian25 (3.7%)
  • Van occupant24 (3.6%)
  • Bus or coach occupant2 (0.3%)
  • Goods vehicle occupant (over 3.5 tonnes)1 (0.1%)
  • Other2 (0.3%)

Vehicles involved

  • Car738 (78%)
  • Motorcycle63 (6.7%)
  • Van or goods vehicle up to 3.5 tonnes55 (5.8%)
  • Pedal cycle47 (5%)
  • Goods vehicle over 3.5 tonnes22 (2.3%)
  • Other vehicle9 (1%)
  • Bus or coach5 (0.5%)
  • Other6 (0.6%)

Casualties by age

  • 0 to 510 (1.5%)
  • 6 to 1018 (2.7%)
  • 11 to 1516 (2.4%)
  • 16 to 20124 (19%)
  • 21 to 2574 (11%)
  • 26 to 35126 (19%)
  • 36 to 45103 (15%)
  • 46 to 5574 (11%)
  • 56 to 6553 (7.9%)
  • 66 to 7529 (4.3%)
  • Over 7525 (3.7%)
  • Not recorded18 (2.7%)

Drivers, passengers and pedestrians

  • Driver or rider504 (75%)
  • Passenger141 (21%)
  • Pedestrian25 (3.7%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4129

Map of the 25 most recent crashes on the A4129

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

A4129 crashes by council area

Collisions on the A4129 were recorded in 2 council areas. Buckinghamshire has the most, with 282, followed by South Oxfordshire (182).

Collisions on the A4129 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stBuckinghamshire282386755
2ndSouth Oxfordshire182281427

A4129 crashes by town

Collisions on the A4129 were recorded in 2 towns and built-up areas, led by Thame (60) and Princes Risborough (35).

Recent crashes on the A4129

These are the 25 most recent collisions on the A4129, from 6 June 2021 to 11 December 2025.

Severity