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CrashStats

A4155 accidents: crash map and statistics

Police recorded 3,422 collisions on the A4155 from 1979 to 2025, with 4,425 casualties. Of those crashes, 54 were fatal and 542 serious, and 55 people were killed.

In 2025 there were 27 collisions on the A4155, up 108% from 13 in 2024, with 33 casualties.

Collisions since 1979
3,422
331st highest of 4,923 roads
Casualties
4,425
1.29 per collision
Fatal collisions
54
55 people killed
Serious collisions
542
617 seriously injured
Collisions in 2025
27
Up 108% on 2024
Casualties in 2025
33
Up 136% on 2024

Crash severity on the A4155

On the A4155, 1.6% of collisions were fatal and 16% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal541.6%
  • Serious54216%
  • Slight2,82683%

Where the A4155 ranks among 4,923 roads

Most collisions
331st
Most casualties
343rd
Most fatal collisions
387th
Most serious collisions
381st

A4155 accidents by year

Collisions on the A4155 peaked at 139 in 1985 and were down to 27 in 2025.

Collisions and casualties on the A4155, 1979 to 2025

  • Collisions
  • Collisions in 2025: 27
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20252733
20241314
20231819
20223236
20212529
20201720
20191717
20182127
20172737
20162641
20153843
20144255
20133949
20125564
20115263
20105781
20094867
20085465
20074861
20066280
20055474
20047185
20037798
200287117
200186117
200079103
199998131
1998100128
199788116
1996106151
199595137
199494124
199382102
1992110147
199186108
1990120159
1989126165
1988116152
1987108143
1986121146
1985139179
1984126161
1983106135
1982124158
1981104131
198092113
1979109144

When crashes happen on the A4155

Friday has the most collisions on the A4155 (621), and 3pm to 6pm is the busiest time of day (733).

Collisions by day of the week

  • Monday492 (14%)
  • Tuesday470 (14%)
  • Wednesday495 (14%)
  • Thursday502 (15%)
  • Friday621 (18%)
  • Saturday486 (14%)
  • Sunday356 (10%)

Collisions by time of day

  • Midnight to 3am146 (4.3%)
  • 3am to 6am39 (1.1%)
  • 6am to 9am419 (12%)
  • 9am to noon520 (15%)
  • Noon to 3pm645 (19%)
  • 3pm to 6pm733 (21%)
  • 6pm to 9pm531 (16%)
  • 9pm to midnight389 (11%)

Collisions by month

  • January296 (8.6%)
  • February244 (7.1%)
  • March261 (7.6%)
  • April284 (8.3%)
  • May277 (8.1%)
  • June291 (8.5%)
  • July302 (8.8%)
  • August279 (8.2%)
  • September276 (8.1%)
  • October300 (8.8%)
  • November315 (9.2%)
  • December297 (8.7%)

Light conditions at the time

  • Daylight2,409 (70%)
  • Dark, street lights lit686 (20%)
  • Dark, no street lighting297 (8.7%)
  • Dark, lighting unknown21 (0.6%)
  • Dark, street lights unlit7 (0.2%)
  • Not recorded2 (0.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4155 crashes

On the A4155, 65% of collisions happened where the speed limit was 30 mph and 66% on a dry road surface.

Speed limit at the scene

  • 20 mph9 (0.3%)
  • 30 mph2,234 (65%)
  • 40 mph238 (7%)
  • 50 mph185 (5.4%)
  • 60 mph739 (22%)
  • 70 mph17 (0.5%)

Weather at the time

  • Fine, no high winds2,715 (79%)
  • Raining, no high winds472 (14%)
  • Fine with high winds33 (1%)
  • Raining with high winds22 (0.6%)
  • Other143 (4.2%)
  • Not recorded37 (1.1%)

Road surface

  • Dry2,265 (66%)
  • Wet or damp1,082 (32%)
  • Frost or ice42 (1.2%)
  • Snow11 (0.3%)
  • Flood over 3cm deep5 (0.1%)
  • Not recorded17 (0.5%)

Type of road

  • Single carriageway2,771 (81%)
  • Roundabout425 (12%)
  • Dual carriageway136 (4%)
  • One way street or slip road86 (2.5%)
  • Not recorded4 (0.1%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4155 crashes

Car occupants make up 57% of the people killed or injured on the A4155, followed by pedestrians (15%).

Casualties by road user

  • Car occupant2,527 (57%)
  • Pedestrian676 (15%)
  • Motorcyclist609 (14%)
  • Cyclist422 (9.5%)
  • Van occupant68 (1.5%)
  • Bus or coach occupant57 (1.3%)
  • Other65 (1.5%)
  • Not recorded1 (under 0.1%)

Vehicles involved

  • Car4,731 (74%)
  • Motorcycle629 (9.9%)
  • Pedal cycle436 (6.9%)
  • Van or goods vehicle up to 3.5 tonnes215 (3.4%)
  • Goods vehicle over 3.5 tonnes124 (1.9%)
  • Bus or coach97 (1.5%)
  • Other106 (1.7%)
  • Not recorded23 (0.4%)

Casualties by age

  • 0 to 550 (1.1%)
  • 6 to 1096 (2.2%)
  • 11 to 15217 (4.9%)
  • 16 to 20863 (20%)
  • 21 to 25636 (14%)
  • 26 to 35806 (18%)
  • 36 to 45578 (13%)
  • 46 to 55416 (9.4%)
  • 56 to 65264 (6%)
  • 66 to 75205 (4.6%)
  • Over 75155 (3.5%)
  • Not recorded139 (3.1%)

Drivers, passengers and pedestrians

  • Driver or rider2,820 (64%)
  • Passenger929 (21%)
  • Pedestrian676 (15%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4155

Map of the 25 most recent crashes on the A4155

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

  • 25 crashes
  • Serious
  • Slight

A4155 crashes by council area

Collisions on the A4155 were recorded in 4 council areas. Reading has the most, with 1,392, followed by Buckinghamshire (1,254) and South Oxfordshire (772).

Collisions on the A4155 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stReading1,3921,71417190
2ndBuckinghamshire1,2541,62717209
3rdSouth Oxfordshire7721,08020142
4thOxford3301

A4155 crashes by town

Collisions on the A4155 were recorded in 6 towns and built-up areas, led by Reading (838) and Caversham (473).

Recent crashes on the A4155

These are the 25 most recent collisions on the A4155, from 23 February to 8 December 2025.

Severity