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CrashStats

B4556 accidents: crash map and statistics

Police recorded 120 collisions on the B4556 from 1979 to 2025, with 177 casualties. Of those crashes, 6 were fatal and 41 serious, and 6 people were killed.

In 2025 there were 4 collisions on the B4556, up from none in 2024, with 6 casualties.

Collisions since 1979
120
3,848th highest of 4,923 roads
Casualties
177
1.48 per collision
Fatal collisions
6
6 people killed
Serious collisions
41
61 seriously injured
Collisions in 2025
4
Up from none in 2024
Casualties in 2025
6
Up from none in 2024

Crash severity on the B4556

On the B4556, 5% of collisions were fatal and 34% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal65%
  • Serious4134%
  • Slight7361%

Where the B4556 ranks among 4,923 roads

Most collisions
3,848th
Most casualties
3,756th
Most fatal collisions
2,299th
Most serious collisions
3,235th

B4556 accidents by year

Collisions on the B4556 peaked at 6 in 2002 and were down to 4 in 2025.

Collisions and casualties on the B4556, 1979 to 2025

  • Collisions
  • Collisions in 2025
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202546
202400
202311
202200
202100
202023
201934
201812
201747
201600
201536
201433
201300
201244
201135
201022
200948
200847
200747
200612
200500
200423
200349
2002614
200112
200000
199948
199833
199747
199622
199535
199411
199323
199222
199156
199034
198966
198833
198712
198644
198544
198413
198333
198200
198169
198011
197966

When crashes happen on the B4556

Sunday has the most collisions on the B4556 (22), and 3pm to 6pm is the busiest time of day (30).

Collisions by day of the week

  • Monday8 (6.7%)
  • Tuesday19 (16%)
  • Wednesday16 (13%)
  • Thursday13 (11%)
  • Friday21 (18%)
  • Saturday21 (18%)
  • Sunday22 (18%)

Collisions by time of day

  • Midnight to 3am11 (9.2%)
  • 3am to 6am7 (5.8%)
  • 6am to 9am17 (14%)
  • 9am to noon10 (8.3%)
  • Noon to 3pm16 (13%)
  • 3pm to 6pm30 (25%)
  • 6pm to 9pm17 (14%)
  • 9pm to midnight12 (10%)

Collisions by month

  • January8 (6.7%)
  • February11 (9.2%)
  • March7 (5.8%)
  • April6 (5%)
  • May13 (11%)
  • June6 (5%)
  • July8 (6.7%)
  • August12 (10%)
  • September16 (13%)
  • October10 (8.3%)
  • November12 (10%)
  • December11 (9.2%)

Light conditions at the time

  • Daylight78 (65%)
  • Dark, street lights lit38 (32%)
  • Dark, lighting unknown1 (0.8%)
  • Dark, no street lighting1 (0.8%)
  • Not recorded2 (1.7%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4556 crashes

On the B4556, 77% of collisions happened where the speed limit was 30 mph and 53% on a dry road surface.

Speed limit at the scene

  • 30 mph92 (77%)
  • 40 mph2 (1.7%)
  • 60 mph26 (22%)

Weather at the time

  • Fine, no high winds77 (64%)
  • Raining, no high winds29 (24%)
  • Raining with high winds4 (3.3%)
  • Fine with high winds1 (0.8%)
  • Other7 (5.8%)
  • Not recorded2 (1.7%)

Road surface

  • Dry64 (53%)
  • Wet or damp47 (39%)
  • Frost or ice6 (5%)
  • Snow1 (0.8%)
  • Not recorded2 (1.7%)

Type of road

  • Single carriageway119 (99%)
  • Roundabout1 (0.8%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4556 crashes

Car occupants make up 69% of the people killed or injured on the B4556, followed by pedestrians (9.6%).

Casualties by road user

  • Car occupant123 (69%)
  • Pedestrian17 (9.6%)
  • Motorcyclist12 (6.8%)
  • Van occupant10 (5.6%)
  • Cyclist6 (3.4%)
  • Taxi or private hire car occupant4 (2.3%)
  • Bus or coach occupant3 (1.7%)
  • Minibus occupant2 (1.1%)

Vehicles involved

  • Car158 (74%)
  • Van or goods vehicle up to 3.5 tonnes15 (7%)
  • Motorcycle12 (5.6%)
  • Goods vehicle over 3.5 tonnes10 (4.7%)
  • Pedal cycle7 (3.3%)
  • Bus or coach4 (1.9%)
  • Minibus2 (0.9%)
  • Other5 (2.3%)

Casualties by age

  • 0 to 53 (1.7%)
  • 6 to 104 (2.3%)
  • 11 to 158 (4.5%)
  • 16 to 2037 (21%)
  • 21 to 2524 (14%)
  • 26 to 3541 (23%)
  • 36 to 4522 (12%)
  • 46 to 5514 (7.9%)
  • 56 to 6515 (8.5%)
  • 66 to 753 (1.7%)
  • Over 756 (3.4%)

Drivers, passengers and pedestrians

  • Driver or rider104 (59%)
  • Passenger56 (32%)
  • Pedestrian17 (9.6%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4556

Map of the 25 most recent crashes on the B4556

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B4556 crashes by council area

All 120 collisions on the B4556 were in Carmarthenshire.

Collisions on the B4556 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCarmarthenshire120177641

B4556 crashes by town

Collisions on the B4556 were recorded in 2 towns and built-up areas, led by Pen-y-groes and Gorslas (38) and Llandybie (14).

Recent crashes on the B4556

These are the 25 most recent collisions on the B4556, from 4 February 2012 to 23 November 2025.

Severity