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CrashStats

B4255 accidents: crash map and statistics

Police recorded 218 collisions on the B4255 from 1979 to 2025, with 306 casualties. Of those crashes, 2 were fatal and 34 serious, and 2 people were killed.

In 2025 there was 1 collision on the B4255, down 50% from 2 in 2024, with 1 casualty.

Collisions since 1979
218
3,134th highest of 4,923 roads
Casualties
306
1.40 per collision
Fatal collisions
2
2 people killed
Serious collisions
34
40 seriously injured
Collisions in 2025
1
Down 50% on 2024
Casualties in 2025
1
Down 50% on 2024

Crash severity on the B4255

On the B4255, 0.9% of collisions were fatal and 16% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal20.9%
  • Serious3416%
  • Slight18283%

Where the B4255 ranks among 4,923 roads

Most collisions
3,134th
Most casualties
3,095th
Most fatal collisions
3,485th
Most serious collisions
3,479th

B4255 accidents by year

Collisions on the B4255 peaked at 13 in 2003 and were down to 1 in 2025.

Collisions and casualties on the B4255, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202422
202322
202223
202135
202000
2019812
201833
201735
201624
201558
201411
201333
201211
201126
201011
200935
200845
200711
2006811
2005714
200456
20031315
2002610
20011018
2000813
1999911
199822
1997810
199624
1995813
199434
199344
199233
199144
1990816
198955
198866
198745
198656
198533
198466
198366
1982917
198168
198069
197979

When crashes happen on the B4255

Friday has the most collisions on the B4255 (38), and 6pm to 9pm is the busiest time of day (45).

Collisions by day of the week

  • Monday19 (8.7%)
  • Tuesday32 (15%)
  • Wednesday29 (13%)
  • Thursday34 (16%)
  • Friday38 (17%)
  • Saturday37 (17%)
  • Sunday29 (13%)

Collisions by time of day

  • Midnight to 3am23 (11%)
  • 3am to 6am4 (1.8%)
  • 6am to 9am19 (8.7%)
  • 9am to noon22 (10%)
  • Noon to 3pm38 (17%)
  • 3pm to 6pm41 (19%)
  • 6pm to 9pm45 (21%)
  • 9pm to midnight26 (12%)

Collisions by month

  • January32 (15%)
  • February18 (8.3%)
  • March21 (9.6%)
  • April8 (3.7%)
  • May19 (8.7%)
  • June15 (6.9%)
  • July23 (11%)
  • August17 (7.8%)
  • September16 (7.3%)
  • October14 (6.4%)
  • November18 (8.3%)
  • December17 (7.8%)

Light conditions at the time

  • Daylight132 (61%)
  • Dark, street lights lit70 (32%)
  • Dark, street lights unlit7 (3.2%)
  • Dark, no street lighting6 (2.8%)
  • Dark, lighting unknown3 (1.4%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4255 crashes

On the B4255, 74% of collisions happened where the speed limit was 30 mph and 57% on a dry road surface.

Speed limit at the scene

  • 20 mph2 (0.9%)
  • 30 mph161 (74%)
  • 40 mph2 (0.9%)
  • 50 mph2 (0.9%)
  • 60 mph48 (22%)
  • 70 mph3 (1.4%)

Weather at the time

  • Fine, no high winds153 (70%)
  • Raining, no high winds46 (21%)
  • Raining with high winds8 (3.7%)
  • Fine with high winds2 (0.9%)
  • Other6 (2.8%)
  • Not recorded3 (1.4%)

Road surface

  • Dry125 (57%)
  • Wet or damp86 (39%)
  • Frost or ice6 (2.8%)
  • Snow1 (0.5%)

Type of road

  • Single carriageway216 (99%)
  • Dual carriageway1 (0.5%)
  • Not recorded1 (0.5%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4255 crashes

Car occupants make up 62% of the people killed or injured on the B4255, followed by pedestrians (18%).

Casualties by road user

  • Car occupant191 (62%)
  • Pedestrian56 (18%)
  • Motorcyclist30 (9.8%)
  • Bus or coach occupant14 (4.6%)
  • Van occupant8 (2.6%)
  • Cyclist3 (1%)
  • Other vehicle occupant3 (1%)
  • Minibus occupant1 (0.3%)

Vehicles involved

  • Car276 (77%)
  • Motorcycle28 (7.8%)
  • Bus or coach22 (6.1%)
  • Van or goods vehicle up to 3.5 tonnes12 (3.4%)
  • Other vehicle9 (2.5%)
  • Pedal cycle4 (1.1%)
  • Minibus3 (0.8%)
  • Other4 (1.1%)

Casualties by age

  • 0 to 59 (2.9%)
  • 6 to 1013 (4.2%)
  • 11 to 1517 (5.6%)
  • 16 to 2082 (27%)
  • 21 to 2550 (16%)
  • 26 to 3554 (18%)
  • 36 to 4524 (7.8%)
  • 46 to 5522 (7.2%)
  • 56 to 6517 (5.6%)
  • 66 to 7513 (4.2%)
  • Over 755 (1.6%)

Drivers, passengers and pedestrians

  • Driver or rider153 (50%)
  • Passenger97 (32%)
  • Pedestrian56 (18%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4255

Map of the 25 most recent crashes on the B4255

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

  • 25 crashes
  • Serious
  • Slight

B4255 crashes by council area

Collisions on the B4255 were recorded in 3 council areas. Merthyr Tydfil has the most, with 122, followed by Caerphilly (84) and Rhondda Cynon Taf (9).

Collisions on the B4255 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stMerthyr Tydfil122171115
2ndCaerphilly84112117
3rdRhondda Cynon Taf91701

B4255 crashes by town

Collisions on the B4255 were recorded in 3 towns and built-up areas, led by Nelson, Caerphilly (75) and Trelewis (37).

Recent crashes on the B4255

These are the 25 most recent collisions on the B4255, from 9 September 2016 to 30 January 2025.

Severity