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CrashStats

B4254 accidents: crash map and statistics

Police recorded 431 collisions on the B4254 from 1979 to 2025, with 644 casualties. Of those crashes, 7 were fatal and 77 serious, and 7 people were killed.

In 2025 there were 4 collisions on the B4254, up 300% from 1 in 2024, with 5 casualties.

Collisions since 1979
431
2,186th highest of 4,923 roads
Casualties
644
1.49 per collision
Fatal collisions
7
7 people killed
Serious collisions
77
90 seriously injured
Collisions in 2025
4
Up 300% on 2024
Casualties in 2025
5
Up 400% on 2024

Crash severity on the B4254

On the B4254, 1.6% of collisions were fatal and 18% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal71.6%
  • Serious7718%
  • Slight34781%

Where the B4254 ranks among 4,923 roads

Most collisions
2,186th
Most casualties
2,029th
Most fatal collisions
2,103rd
Most serious collisions
2,343rd

B4254 accidents by year

Collisions on the B4254 peaked at 21 in 1981 and were down to 4 in 2025.

Collisions and casualties on the B4254, 1979 to 2025

  • Collisions
  • Collisions in 2025: 4
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202545
202411
202323
202244
202168
202044
201968
2018710
201746
201636
2015813
201449
2013715
2012811
2011511
2010910
2009614
20081118
200779
20061931
200546
2004922
200368
2002811
20011318
20001116
19991014
1998914
1997710
1996919
19951217
19941420
19931013
199255
19911013
199088
19891115
19881818
19871521
19861317
19851015
1984810
19831523
19821939
19812130
19801420
19791726

When crashes happen on the B4254

Saturday has the most collisions on the B4254 (80), and 3pm to 6pm is the busiest time of day (113).

Collisions by day of the week

  • Monday60 (14%)
  • Tuesday57 (13%)
  • Wednesday55 (13%)
  • Thursday65 (15%)
  • Friday72 (17%)
  • Saturday80 (19%)
  • Sunday42 (9.7%)

Collisions by time of day

  • Midnight to 3am22 (5.1%)
  • 3am to 6am3 (0.7%)
  • 6am to 9am48 (11%)
  • 9am to noon52 (12%)
  • Noon to 3pm77 (18%)
  • 3pm to 6pm113 (26%)
  • 6pm to 9pm60 (14%)
  • 9pm to midnight56 (13%)

Collisions by month

  • January50 (12%)
  • February33 (7.7%)
  • March39 (9%)
  • April39 (9%)
  • May38 (8.8%)
  • June30 (7%)
  • July33 (7.7%)
  • August31 (7.2%)
  • September28 (6.5%)
  • October42 (9.7%)
  • November46 (11%)
  • December22 (5.1%)

Light conditions at the time

  • Daylight306 (71%)
  • Dark, street lights lit99 (23%)
  • Dark, street lights unlit13 (3%)
  • Dark, no street lighting7 (1.6%)
  • Dark, lighting unknown5 (1.2%)
  • Not recorded1 (0.2%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4254 crashes

On the B4254, 83% of collisions happened where the speed limit was 30 mph and 62% on a dry road surface.

Speed limit at the scene

  • 10 mph1 (0.2%)
  • 20 mph5 (1.2%)
  • 30 mph359 (83%)
  • 40 mph26 (6%)
  • 50 mph2 (0.5%)
  • 60 mph37 (8.6%)
  • 70 mph1 (0.2%)

Weather at the time

  • Fine, no high winds307 (71%)
  • Raining, no high winds76 (18%)
  • Raining with high winds10 (2.3%)
  • Fine with high winds8 (1.9%)
  • Other22 (5.1%)
  • Not recorded8 (1.9%)

Road surface

  • Dry267 (62%)
  • Wet or damp144 (33%)
  • Frost or ice12 (2.8%)
  • Snow7 (1.6%)
  • Not recorded1 (0.2%)

Type of road

  • Single carriageway422 (98%)
  • Dual carriageway4 (0.9%)
  • One way street or slip road4 (0.9%)
  • Not recorded1 (0.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4254 crashes

Car occupants make up 60% of the people killed or injured on the B4254, followed by pedestrians (16%).

Casualties by road user

  • Car occupant388 (60%)
  • Pedestrian104 (16%)
  • Bus or coach occupant52 (8.1%)
  • Motorcyclist48 (7.5%)
  • Cyclist21 (3.3%)
  • Van occupant12 (1.9%)
  • Taxi or private hire car occupant8 (1.2%)
  • Other11 (1.7%)

Vehicles involved

  • Car557 (77%)
  • Motorcycle47 (6.5%)
  • Bus or coach42 (5.8%)
  • Van or goods vehicle up to 3.5 tonnes28 (3.9%)
  • Pedal cycle22 (3%)
  • Goods vehicle over 3.5 tonnes12 (1.7%)
  • Other vehicle8 (1.1%)
  • Other10 (1.4%)

Casualties by age

  • 0 to 516 (2.5%)
  • 6 to 1032 (5%)
  • 11 to 1556 (8.7%)
  • 16 to 20135 (21%)
  • 21 to 2588 (14%)
  • 26 to 35108 (17%)
  • 36 to 4584 (13%)
  • 46 to 5560 (9.3%)
  • 56 to 6525 (3.9%)
  • 66 to 7526 (4%)
  • Over 7514 (2.2%)

Drivers, passengers and pedestrians

  • Driver or rider335 (52%)
  • Passenger205 (32%)
  • Pedestrian104 (16%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4254

Map of the 25 most recent crashes on the B4254

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

  • 25 crashes
  • Serious
  • Slight

B4254 crashes by council area

Collisions on the B4254 were recorded in 2 council areas. Caerphilly has the most, with 346, followed by Merthyr Tydfil (80).

Collisions on the B4254 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCaerphilly346531768
2ndMerthyr Tydfil8010608

B4254 crashes by town

Collisions on the B4254 were recorded in 7 towns and built-up areas, led by Blackwood (88) and Pen-pedair-heol (69).

Recent crashes on the B4254

These are the 25 most recent collisions on the B4254, from 16 October 2019 to 20 December 2025.

Severity