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CrashStats

A4127 accidents: crash map and statistics

Police recorded 3,891 collisions on the A4127 from 1979 to 2025, with 4,876 casualties. Of those crashes, 48 were fatal and 566 serious, and 51 people were killed.

In 2025 there were 41 collisions on the A4127, up 24% from 33 in 2024, with 47 casualties.

Collisions since 1979
3,891
281st highest of 4,923 roads
Casualties
4,876
1.25 per collision
Fatal collisions
48
51 people killed
Serious collisions
566
629 seriously injured
Collisions in 2025
41
Up 24% on 2024
Casualties in 2025
47
Up 24% on 2024

Crash severity on the A4127

On the A4127, 1.2% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal481.2%
  • Serious56615%
  • Slight3,27784%

Where the A4127 ranks among 4,923 roads

Most collisions
281st
Most casualties
312th
Most fatal collisions
436th
Most serious collisions
362nd

A4127 accidents by year

Collisions on the A4127 peaked at 146 in 1980 and were down to 41 in 2025.

Collisions and casualties on the A4127, 1979 to 2025

  • Collisions
  • Collisions in 2025: 41
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20254147
20243338
20233638
20224859
20216677
20204555
20196078
20186478
20176476
201680102
20156577
201488104
20136175
20125677
20116178
20105062
20096477
20085978
20076069
20065773
200593115
20047188
200379101
200284110
200197120
200098123
199983105
199885116
199784110
199687105
19957586
1994100116
199397119
199286102
19916678
1990109123
1989129172
1988117151
1987107137
1986125149
1985120137
1984125159
1983117148
198295130
1981123169
1980146197
1979135192

When crashes happen on the A4127

Friday has the most collisions on the A4127 (615), and 3pm to 6pm is the busiest time of day (779).

Collisions by day of the week

  • Monday558 (14%)
  • Tuesday559 (14%)
  • Wednesday561 (14%)
  • Thursday564 (14%)
  • Friday615 (16%)
  • Saturday596 (15%)
  • Sunday438 (11%)

Collisions by time of day

  • Midnight to 3am201 (5.2%)
  • 3am to 6am62 (1.6%)
  • 6am to 9am501 (13%)
  • 9am to noon485 (12%)
  • Noon to 3pm689 (18%)
  • 3pm to 6pm779 (20%)
  • 6pm to 9pm690 (18%)
  • 9pm to midnight484 (12%)

Collisions by month

  • January322 (8.3%)
  • February285 (7.3%)
  • March312 (8%)
  • April326 (8.4%)
  • May318 (8.2%)
  • June333 (8.6%)
  • July325 (8.4%)
  • August312 (8%)
  • September333 (8.6%)
  • October351 (9%)
  • November342 (8.8%)
  • December332 (8.5%)

Light conditions at the time

  • Daylight2,549 (66%)
  • Dark, street lights lit1,283 (33%)
  • Dark, lighting unknown34 (0.9%)
  • Dark, street lights unlit18 (0.5%)
  • Dark, no street lighting7 (0.2%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4127 crashes

On the A4127, 81% of collisions happened where the speed limit was 30 mph and 75% on a dry road surface.

Speed limit at the scene

  • 20 mph202 (5.2%)
  • 30 mph3,139 (81%)
  • 40 mph529 (14%)
  • 50 mph5 (0.1%)
  • 60 mph6 (0.2%)
  • 70 mph10 (0.3%)

Weather at the time

  • Fine, no high winds2,880 (74%)
  • Raining, no high winds510 (13%)
  • Fine with high winds25 (0.6%)
  • Fog or mist20 (0.5%)
  • Other422 (11%)
  • Not recorded34 (0.9%)

Road surface

  • Dry2,901 (75%)
  • Wet or damp916 (24%)
  • Frost or ice41 (1.1%)
  • Snow16 (0.4%)
  • Other3 (0.1%)
  • Not recorded14 (0.4%)

Type of road

  • Single carriageway2,935 (75%)
  • Dual carriageway433 (11%)
  • Roundabout170 (4.4%)
  • One way street or slip road32 (0.8%)
  • Not recorded321 (8.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4127 crashes

Car occupants make up 58% of the people killed or injured on the A4127, followed by pedestrians (16%).

Casualties by road user

  • Car occupant2,820 (58%)
  • Pedestrian796 (16%)
  • Motorcyclist712 (15%)
  • Cyclist270 (5.5%)
  • Van occupant124 (2.5%)
  • Bus or coach occupant92 (1.9%)
  • Other60 (1.2%)
  • Not recorded2 (under 0.1%)

Vehicles involved

  • Car5,334 (75%)
  • Motorcycle753 (11%)
  • Van or goods vehicle up to 3.5 tonnes410 (5.7%)
  • Pedal cycle279 (3.9%)
  • Goods vehicle over 3.5 tonnes149 (2.1%)
  • Bus or coach138 (1.9%)
  • Other vehicle42 (0.6%)
  • Other51 (0.7%)

Casualties by age

  • 0 to 592 (1.9%)
  • 6 to 10139 (2.9%)
  • 11 to 15180 (3.7%)
  • 16 to 20588 (12%)
  • 21 to 25686 (14%)
  • 26 to 351,158 (24%)
  • 36 to 45707 (14%)
  • 46 to 55480 (9.8%)
  • 56 to 65321 (6.6%)
  • 66 to 75152 (3.1%)
  • Over 75107 (2.2%)
  • Not recorded266 (5.5%)

Drivers, passengers and pedestrians

  • Driver or rider2,984 (61%)
  • Passenger1,096 (22%)
  • Pedestrian796 (16%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4127

Map of the 25 most recent crashes on the A4127

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

  • 25 crashes
  • Serious
  • Slight

A4127 crashes by council area

Collisions on the A4127 were recorded in 5 council areas. Ealing has the most, with 3,188, followed by Harrow (283) and Hounslow (280).

Collisions on the A4127 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stEaling3,1884,03041468
2ndHarrow283336427
3rdHounslow280338146
4thBrent133163223
5thRichmond upon Thames3400

A4127 crashes by town

Collisions on the A4127 were recorded in 4 towns and built-up areas, led by Ealing (2,651) and Harrow (283).

Recent crashes on the A4127

These are the 25 most recent collisions on the A4127, from 11 June to 22 December 2025.

Severity