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CrashStats

B4275 accidents: crash map and statistics

Police recorded 1,082 collisions on the B4275 from 1979 to 2025, with 1,486 casualties. Of those crashes, 17 were fatal and 143 serious, and 17 people were killed.

In 2025 there were 6 collisions on the B4275, up 50% from 4 in 2024, with 9 casualties.

Collisions since 1979
1,082
1,011th highest of 4,923 roads
Casualties
1,486
1.37 per collision
Fatal collisions
17
17 people killed
Serious collisions
143
170 seriously injured
Collisions in 2025
6
Up 50% on 2024
Casualties in 2025
9
Up 125% on 2024

Crash severity on the B4275

On the B4275, 1.6% of collisions were fatal and 13% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal171.6%
  • Serious14313%
  • Slight92285%

Where the B4275 ranks among 4,923 roads

Most collisions
1,011th
Most casualties
1,002nd
Most fatal collisions
1,125th
Most serious collisions
1,427th

B4275 accidents by year

Collisions on the B4275 peaked at 52 in 1988 and were down to 6 in 2025.

Collisions and casualties on the B4275, 1979 to 2025

  • Collisions
  • Collisions in 2025: 6
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202569
202444
20231317
202289
20211216
202079
20191920
20181318
20171518
20161725
20152743
20141830
20131620
20121221
20112639
20102031
20092236
20082955
20074073
20062634
20052640
20043750
20032537
20023548
20013350
20002737
19991113
19982737
19972537
19963649
19952332
19943349
19931820
19922224
19913036
19904458
19894452
19885270
19872225
19861720
19851924
19841212
19833336
19821921
19811924
19801722
19792636

When crashes happen on the B4275

Saturday has the most collisions on the B4275 (190), and 3pm to 6pm is the busiest time of day (302).

Collisions by day of the week

  • Monday148 (14%)
  • Tuesday152 (14%)
  • Wednesday166 (15%)
  • Thursday152 (14%)
  • Friday156 (14%)
  • Saturday190 (18%)
  • Sunday118 (11%)

Collisions by time of day

  • Midnight to 3am57 (5.3%)
  • 3am to 6am8 (0.7%)
  • 6am to 9am82 (7.6%)
  • 9am to noon142 (13%)
  • Noon to 3pm184 (17%)
  • 3pm to 6pm302 (28%)
  • 6pm to 9pm179 (17%)
  • 9pm to midnight128 (12%)

Collisions by month

  • January71 (6.6%)
  • February79 (7.3%)
  • March89 (8.2%)
  • April81 (7.5%)
  • May83 (7.7%)
  • June94 (8.7%)
  • July93 (8.6%)
  • August84 (7.8%)
  • September85 (7.9%)
  • October102 (9.4%)
  • November115 (11%)
  • December106 (9.8%)

Light conditions at the time

  • Daylight712 (66%)
  • Dark, street lights lit292 (27%)
  • Dark, street lights unlit33 (3%)
  • Dark, no street lighting25 (2.3%)
  • Dark, lighting unknown15 (1.4%)
  • Not recorded5 (0.5%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4275 crashes

On the B4275, 95% of collisions happened where the speed limit was 30 mph and 68% on a dry road surface.

Speed limit at the scene

  • 20 mph16 (1.5%)
  • 30 mph1,024 (95%)
  • 40 mph30 (2.8%)
  • 50 mph2 (0.2%)
  • 60 mph10 (0.9%)

Weather at the time

  • Fine, no high winds853 (79%)
  • Raining, no high winds169 (16%)
  • Raining with high winds19 (1.8%)
  • Fine with high winds15 (1.4%)
  • Other13 (1.2%)
  • Not recorded13 (1.2%)

Road surface

  • Dry734 (68%)
  • Wet or damp328 (30%)
  • Frost or ice8 (0.7%)
  • Snow4 (0.4%)
  • Flood over 3cm deep2 (0.2%)
  • Not recorded6 (0.6%)

Type of road

  • Single carriageway1,034 (96%)
  • One way street or slip road16 (1.5%)
  • Roundabout14 (1.3%)
  • Dual carriageway12 (1.1%)
  • Not recorded6 (0.6%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4275 crashes

Car occupants make up 57% of the people killed or injured on the B4275, followed by pedestrians (26%).

Casualties by road user

  • Car occupant842 (57%)
  • Pedestrian382 (26%)
  • Motorcyclist81 (5.5%)
  • Bus or coach occupant74 (5%)
  • Cyclist44 (3%)
  • Van occupant29 (2%)
  • Taxi or private hire car occupant15 (1%)
  • Other19 (1.3%)

Vehicles involved

  • Car1,436 (79%)
  • Bus or coach98 (5.4%)
  • Motorcycle92 (5.1%)
  • Van or goods vehicle up to 3.5 tonnes76 (4.2%)
  • Pedal cycle45 (2.5%)
  • Goods vehicle over 3.5 tonnes20 (1.1%)
  • Other41 (2.3%)
  • Not recorded1 (0.1%)

Casualties by age

  • 0 to 543 (2.9%)
  • 6 to 1097 (6.5%)
  • 11 to 15115 (7.7%)
  • 16 to 20257 (17%)
  • 21 to 25207 (14%)
  • 26 to 35255 (17%)
  • 36 to 45159 (11%)
  • 46 to 55127 (8.5%)
  • 56 to 65108 (7.3%)
  • 66 to 7561 (4.1%)
  • Over 7553 (3.6%)
  • Not recorded4 (0.3%)

Drivers, passengers and pedestrians

  • Driver or rider689 (46%)
  • Passenger415 (28%)
  • Pedestrian382 (26%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4275

Map of the 25 most recent crashes on the B4275

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B4275 crashes by council area

Collisions on the B4275 were recorded in 2 council areas. Rhondda Cynon Taf has the most, with 1,077, followed by Merthyr Tydfil (3).

Collisions on the B4275 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stRhondda Cynon Taf1,0771,47917142
2ndMerthyr Tydfil3301

B4275 crashes by town

Collisions on the B4275 were recorded in 3 towns and built-up areas, led by Aberdare (467) and Mountain Ash (265).

Recent crashes on the B4275

These are the 25 most recent collisions on the B4275, from 21 December 2022 to 27 November 2025.

Severity