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CrashStats

B4278 accidents: crash map and statistics

Police recorded 348 collisions on the B4278 from 1979 to 2025, with 502 casualties. Of those crashes, 11 were fatal and 52 serious, and 13 people were killed.

In 2025 there was 1 collision on the B4278, down 83% from 6 in 2024, with 1 casualty.

Collisions since 1979
348
2,498th highest of 4,923 roads
Casualties
502
1.44 per collision
Fatal collisions
11
13 people killed
Serious collisions
52
64 seriously injured
Collisions in 2025
1
Down 83% on 2024
Casualties in 2025
1
Down 88% on 2024

Crash severity on the B4278

On the B4278, 3.2% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal113.2%
  • Serious5215%
  • Slight28582%

Where the B4278 ranks among 4,923 roads

Most collisions
2,498th
Most casualties
2,411th
Most fatal collisions
1,595th
Most serious collisions
2,914th

B4278 accidents by year

Collisions on the B4278 peaked at 16 in 2013 and were down to 1 in 2025.

Collisions and casualties on the B4278, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202468
202333
202288
202156
2020710
2019912
20181220
2017912
2016919
20151417
20141114
20131625
201259
201167
2010912
200947
2008811
20071419
200658
2005915
20041215
20031520
20021114
2001716
200048
199922
199800
199789
199689
19951119
199433
1993812
19921012
1991812
199036
19891010
1988912
198759
198655
1985621
198467
198348
198279
198155
198069
197957

When crashes happen on the B4278

Friday has the most collisions on the B4278 (66), and 3pm to 6pm is the busiest time of day (89).

Collisions by day of the week

  • Monday42 (12%)
  • Tuesday43 (12%)
  • Wednesday45 (13%)
  • Thursday45 (13%)
  • Friday66 (19%)
  • Saturday62 (18%)
  • Sunday45 (13%)

Collisions by time of day

  • Midnight to 3am18 (5.2%)
  • 3am to 6am5 (1.4%)
  • 6am to 9am29 (8.3%)
  • 9am to noon55 (16%)
  • Noon to 3pm67 (19%)
  • 3pm to 6pm89 (26%)
  • 6pm to 9pm44 (13%)
  • 9pm to midnight41 (12%)

Collisions by month

  • January35 (10%)
  • February18 (5.2%)
  • March35 (10%)
  • April28 (8%)
  • May41 (12%)
  • June25 (7.2%)
  • July25 (7.2%)
  • August22 (6.3%)
  • September36 (10%)
  • October22 (6.3%)
  • November36 (10%)
  • December25 (7.2%)

Light conditions at the time

  • Daylight245 (70%)
  • Dark, street lights lit86 (25%)
  • Dark, street lights unlit9 (2.6%)
  • Dark, lighting unknown3 (0.9%)
  • Dark, no street lighting3 (0.9%)
  • Not recorded2 (0.6%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4278 crashes

On the B4278, 90% of collisions happened where the speed limit was 30 mph and 61% on a dry road surface.

Speed limit at the scene

  • 20 mph6 (1.7%)
  • 30 mph312 (90%)
  • 40 mph6 (1.7%)
  • 50 mph1 (0.3%)
  • 60 mph23 (6.6%)

Weather at the time

  • Fine, no high winds257 (74%)
  • Raining, no high winds65 (19%)
  • Raining with high winds8 (2.3%)
  • Fine with high winds7 (2%)
  • Other5 (1.4%)
  • Not recorded6 (1.7%)

Road surface

  • Dry214 (61%)
  • Wet or damp117 (34%)
  • Frost or ice12 (3.4%)
  • Flood over 3cm deep2 (0.6%)
  • Snow1 (0.3%)
  • Not recorded2 (0.6%)

Type of road

  • Single carriageway301 (86%)
  • Roundabout29 (8.3%)
  • One way street or slip road12 (3.4%)
  • Dual carriageway5 (1.4%)
  • Not recorded1 (0.3%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4278 crashes

Car occupants make up 68% of the people killed or injured on the B4278, followed by pedestrians (16%).

Casualties by road user

  • Car occupant343 (68%)
  • Pedestrian80 (16%)
  • Bus or coach occupant27 (5.4%)
  • Motorcyclist22 (4.4%)
  • Cyclist12 (2.4%)
  • Taxi or private hire car occupant6 (1.2%)
  • Van occupant5 (1%)
  • Other7 (1.4%)

Vehicles involved

  • Car481 (80%)
  • Motorcycle24 (4%)
  • Van or goods vehicle up to 3.5 tonnes24 (4%)
  • Bus or coach21 (3.5%)
  • Goods vehicle over 3.5 tonnes18 (3%)
  • Pedal cycle12 (2%)
  • Other vehicle8 (1.3%)
  • Other10 (1.7%)

Casualties by age

  • 0 to 510 (2%)
  • 6 to 1015 (3%)
  • 11 to 1533 (6.6%)
  • 16 to 20108 (22%)
  • 21 to 2578 (16%)
  • 26 to 3579 (16%)
  • 36 to 4567 (13%)
  • 46 to 5538 (7.6%)
  • 56 to 6529 (5.8%)
  • 66 to 7527 (5.4%)
  • Over 7518 (3.6%)

Drivers, passengers and pedestrians

  • Driver or rider238 (47%)
  • Passenger184 (37%)
  • Pedestrian80 (16%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4278

Map of the 25 most recent crashes on the B4278

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B4278 crashes by council area

Of the 348 collisions on the B4278, 347 were in Rhondda Cynon Taf.

Collisions on the B4278 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stRhondda Cynon Taf3475011151

B4278 crashes by town

Collisions on the B4278 were recorded in 4 towns and built-up areas, led by Tonypandy (129) and Porth (79).

Recent crashes on the B4278

These are the 25 most recent collisions on the B4278, from 12 July 2020 to 23 June 2025.

Severity