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CrashStats

B4257 accidents: crash map and statistics

Police recorded 190 collisions on the B4257 from 1981 to 2025, with 263 casualties. Of those crashes, 3 were fatal and 38 serious, and 3 people were killed.

In 2025 there was 1 collision on the B4257, up from none in 2024, with 1 casualty.

Collisions since 1981
190
3,297th highest of 4,923 roads
Casualties
263
1.38 per collision
Fatal collisions
3
3 people killed
Serious collisions
38
44 seriously injured
Collisions in 2025
1
Up from none in 2024
Casualties in 2025
1
Up from none in 2024

Crash severity on the B4257

On the B4257, 1.6% of collisions were fatal and 20% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1981 to 2025

  • Fatal31.6%
  • Serious3820%
  • Slight14978%

Where the B4257 ranks among 4,923 roads

Most collisions
3,297th
Most casualties
3,288th
Most fatal collisions
3,114th
Most serious collisions
3,345th

B4257 accidents by year

Collisions on the B4257 peaked at 13 in 1989 and were down to 1 in 2025.

Collisions and casualties on the B4257, 1981 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202400
202311
202222
202159
202023
201913
201811
201700
201622
201512
201444
201322
201236
201100
201023
200911
200858
200768
2006610
200555
2004616
200335
200235
200155
20001017
199969
199844
199748
199646
199568
1994711
1993812
199266
199177
199055
19891315
19881011
1987810
198678
198534
198444
1983510
198222
198144

When crashes happen on the B4257

Friday has the most collisions on the B4257 (43), and 3pm to 6pm is the busiest time of day (43).

Collisions by day of the week

  • Monday24 (13%)
  • Tuesday20 (11%)
  • Wednesday19 (10%)
  • Thursday22 (12%)
  • Friday43 (23%)
  • Saturday37 (19%)
  • Sunday25 (13%)

Collisions by time of day

  • Midnight to 3am6 (3.2%)
  • 3am to 6am1 (0.5%)
  • 6am to 9am5 (2.6%)
  • 9am to noon20 (11%)
  • Noon to 3pm36 (19%)
  • 3pm to 6pm43 (23%)
  • 6pm to 9pm42 (22%)
  • 9pm to midnight37 (19%)

Collisions by month

  • January18 (9.5%)
  • February20 (11%)
  • March17 (8.9%)
  • April5 (2.6%)
  • May13 (6.8%)
  • June17 (8.9%)
  • July21 (11%)
  • August17 (8.9%)
  • September18 (9.5%)
  • October15 (7.9%)
  • November16 (8.4%)
  • December13 (6.8%)

Light conditions at the time

  • Daylight115 (61%)
  • Dark, street lights lit60 (32%)
  • Dark, street lights unlit7 (3.7%)
  • Dark, lighting unknown4 (2.1%)
  • Dark, no street lighting3 (1.6%)
  • Not recorded1 (0.5%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4257 crashes

On the B4257, 97% of collisions happened where the speed limit was 30 mph and 63% on a dry road surface.

Speed limit at the scene

  • 20 mph1 (0.5%)
  • 30 mph184 (97%)
  • 40 mph1 (0.5%)
  • 60 mph4 (2.1%)

Weather at the time

  • Fine, no high winds144 (76%)
  • Raining, no high winds27 (14%)
  • Raining with high winds7 (3.7%)
  • Fine with high winds3 (1.6%)
  • Other7 (3.7%)
  • Not recorded2 (1.1%)

Road surface

  • Dry119 (63%)
  • Wet or damp60 (32%)
  • Frost or ice6 (3.2%)
  • Snow4 (2.1%)
  • Not recorded1 (0.5%)

Type of road

  • Single carriageway188 (99%)
  • Dual carriageway1 (0.5%)
  • Not recorded1 (0.5%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4257 crashes

Car occupants make up 56% of the people killed or injured on the B4257, followed by pedestrians (25%).

Casualties by road user

  • Car occupant148 (56%)
  • Pedestrian67 (25%)
  • Motorcyclist15 (5.7%)
  • Bus or coach occupant10 (3.8%)
  • Cyclist9 (3.4%)
  • Van occupant7 (2.7%)
  • Taxi or private hire car occupant5 (1.9%)
  • Goods vehicle occupant (over 3.5 tonnes)2 (0.8%)

Vehicles involved

  • Car251 (83%)
  • Motorcycle16 (5.3%)
  • Pedal cycle9 (3%)
  • Van or goods vehicle up to 3.5 tonnes9 (3%)
  • Bus or coach7 (2.3%)
  • Goods vehicle over 3.5 tonnes5 (1.7%)
  • Taxi or private hire car4 (1.3%)

Casualties by age

  • 0 to 54 (1.5%)
  • 6 to 1019 (7.2%)
  • 11 to 1522 (8.4%)
  • 16 to 2058 (22%)
  • 21 to 2547 (18%)
  • 26 to 3543 (16%)
  • 36 to 4526 (9.9%)
  • 46 to 5516 (6.1%)
  • 56 to 6511 (4.2%)
  • 66 to 759 (3.4%)
  • Over 757 (2.7%)
  • Not recorded1 (0.4%)

Drivers, passengers and pedestrians

  • Driver or rider126 (48%)
  • Passenger70 (27%)
  • Pedestrian67 (25%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4257

Map of the 25 most recent crashes on the B4257

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

  • 25 crashes
  • Serious
  • Slight

B4257 crashes by council area

All 190 collisions on the B4257 were in Caerphilly.

Collisions on the B4257 in each area, 1981 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCaerphilly190263338

B4257 crashes by town

Collisions on the B4257 were recorded in 2 towns and built-up areas, led by Rhymney (127) and Pontlottyn (6).

Recent crashes on the B4257

These are the 25 most recent collisions on the B4257, from 16 January 2012 to 18 July 2025.

Severity