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CrashStats

B4252 accidents: crash map and statistics

Police recorded 121 collisions on the B4252 from 1979 to 2025, with 173 casualties. Of those crashes, 5 were fatal and 23 serious, and 5 people were killed.

In 2025 there was 1 collision on the B4252, level with 2024, with 1 casualty.

Collisions since 1979
121
3,837th highest of 4,923 roads
Casualties
173
1.43 per collision
Fatal collisions
5
5 people killed
Serious collisions
23
27 seriously injured
Collisions in 2025
1
Level with 2024
Casualties in 2025
1
Level with 2024

Crash severity on the B4252

On the B4252, 4.1% of collisions were fatal and 19% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal54.1%
  • Serious2319%
  • Slight9377%

Where the B4252 ranks among 4,923 roads

Most collisions
3,837th
Most casualties
3,784th
Most fatal collisions
2,545th
Most serious collisions
3,899th

B4252 accidents by year

Collisions on the B4252 peaked at 9 in 1979 and were down to 1 in 2025.

Collisions and casualties on the B4252, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202411
202300
202225
202113
202000
201924
201811
201714
201622
201500
201436
201311
201200
201100
201011
200900
200811
200722
200633
200523
200411
200333
200246
200125
200059
199922
199811
199700
1996511
199545
199428
199344
199255
199122
199056
198933
198844
198733
198646
198566
198447
198368
198255
198158
198036
1979911

When crashes happen on the B4252

Monday has the most collisions on the B4252 (26), and 3pm to 6pm is the busiest time of day (31).

Collisions by day of the week

  • Monday26 (21%)
  • Tuesday17 (14%)
  • Wednesday12 (9.9%)
  • Thursday21 (17%)
  • Friday13 (11%)
  • Saturday20 (17%)
  • Sunday12 (9.9%)

Collisions by time of day

  • Midnight to 3am5 (4.1%)
  • 3am to 6am2 (1.7%)
  • 6am to 9am8 (6.6%)
  • 9am to noon13 (11%)
  • Noon to 3pm21 (17%)
  • 3pm to 6pm31 (26%)
  • 6pm to 9pm17 (14%)
  • 9pm to midnight24 (20%)

Collisions by month

  • January12 (9.9%)
  • February6 (5%)
  • March7 (5.8%)
  • April6 (5%)
  • May11 (9.1%)
  • June17 (14%)
  • July8 (6.6%)
  • August15 (12%)
  • September12 (9.9%)
  • October10 (8.3%)
  • November5 (4.1%)
  • December12 (9.9%)

Light conditions at the time

  • Daylight77 (64%)
  • Dark, street lights lit36 (30%)
  • Dark, no street lighting5 (4.1%)
  • Dark, street lights unlit2 (1.7%)
  • Dark, lighting unknown1 (0.8%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4252 crashes

On the B4252, 93% of collisions happened where the speed limit was 30 mph and 53% on a dry road surface.

Speed limit at the scene

  • 20 mph2 (1.7%)
  • 30 mph113 (93%)
  • 40 mph1 (0.8%)
  • 60 mph5 (4.1%)

Weather at the time

  • Fine, no high winds84 (69%)
  • Raining, no high winds22 (18%)
  • Raining with high winds2 (1.7%)
  • Snowing, no high winds2 (1.7%)
  • Fine with high winds1 (0.8%)
  • Other10 (8.3%)

Road surface

  • Dry64 (53%)
  • Wet or damp56 (46%)
  • Frost or ice1 (0.8%)

Type of road

  • Single carriageway121 (100%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4252 crashes

Car occupants make up 64% of the people killed or injured on the B4252, followed by pedestrians (17%).

Casualties by road user

  • Car occupant111 (64%)
  • Pedestrian30 (17%)
  • Motorcyclist18 (10%)
  • Cyclist7 (4%)
  • Bus or coach occupant3 (1.7%)
  • Van occupant2 (1.2%)
  • Taxi or private hire car occupant1 (0.6%)
  • Not recorded1 (0.6%)

Vehicles involved

  • Car166 (79%)
  • Motorcycle17 (8.1%)
  • Bus or coach8 (3.8%)
  • Van or goods vehicle up to 3.5 tonnes8 (3.8%)
  • Pedal cycle7 (3.3%)
  • Goods vehicle over 3.5 tonnes1 (0.5%)
  • Other vehicle1 (0.5%)
  • Other2 (1%)

Casualties by age

  • 0 to 513 (7.5%)
  • 6 to 108 (4.6%)
  • 11 to 1510 (5.8%)
  • 16 to 2035 (20%)
  • 21 to 2524 (14%)
  • 26 to 3530 (17%)
  • 36 to 4519 (11%)
  • 46 to 5513 (7.5%)
  • 56 to 6512 (6.9%)
  • 66 to 753 (1.7%)
  • Over 755 (2.9%)
  • Not recorded1 (0.6%)

Drivers, passengers and pedestrians

  • Driver or rider84 (49%)
  • Passenger59 (34%)
  • Pedestrian30 (17%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4252

Map of the 25 most recent crashes on the B4252

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B4252 crashes by council area

Of the 121 collisions on the B4252, 118 were in Caerphilly.

Collisions on the B4252 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCaerphilly118167423

B4252 crashes by town

Collisions on the B4252 were recorded in 2 towns and built-up areas, led by Fleur-de-lis and Pengam (93) and Maesycwmmer (7).

Recent crashes on the B4252

These are the 25 most recent collisions on the B4252, from 7 June 2004 to 25 December 2025.

Severity