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CrashStats

B4309 accidents: crash map and statistics

Police recorded 478 collisions on the B4309 from 1979 to 2025, with 704 casualties. Of those crashes, 11 were fatal and 152 serious, and 11 people were killed.

In 2025 there were 5 collisions on the B4309, level with 2024, with 8 casualties.

Collisions since 1979
478
2,041st highest of 4,923 roads
Casualties
704
1.47 per collision
Fatal collisions
11
11 people killed
Serious collisions
152
208 seriously injured
Collisions in 2025
5
Level with 2024
Casualties in 2025
8
Up 14% on 2024

Crash severity on the B4309

On the B4309, 2.3% of collisions were fatal and 32% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal112.3%
  • Serious15232%
  • Slight31566%

Where the B4309 ranks among 4,923 roads

Most collisions
2,041st
Most casualties
1,912th
Most fatal collisions
1,595th
Most serious collisions
1,362nd

B4309 accidents by year

Collisions on the B4309 peaked at 21 in 1990 and were down to 5 in 2025.

Collisions and casualties on the B4309, 1979 to 2025

  • Collisions
  • Collisions in 2025
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202558
202457
2023819
202266
202113
202067
2019710
201845
201745
2016712
2015911
201468
20131728
2012916
20111213
201078
2009711
20081416
20071119
20061114
20051520
20041223
20031317
20021116
2001920
200066
1999914
19981015
1997612
19961422
19951220
19941526
19931216
19921418
19911215
19902129
1989911
19881821
19871721
19861117
19851517
1984821
1983915
19821215
19811012
1980918
19791321

When crashes happen on the B4309

Tuesday has the most collisions on the B4309 (94), and 3pm to 6pm is the busiest time of day (115).

Collisions by day of the week

  • Monday66 (14%)
  • Tuesday94 (20%)
  • Wednesday71 (15%)
  • Thursday80 (17%)
  • Friday61 (13%)
  • Saturday69 (14%)
  • Sunday37 (7.7%)

Collisions by time of day

  • Midnight to 3am19 (4%)
  • 3am to 6am16 (3.3%)
  • 6am to 9am74 (15%)
  • 9am to noon65 (14%)
  • Noon to 3pm68 (14%)
  • 3pm to 6pm115 (24%)
  • 6pm to 9pm81 (17%)
  • 9pm to midnight40 (8.4%)

Collisions by month

  • January27 (5.6%)
  • February32 (6.7%)
  • March42 (8.8%)
  • April32 (6.7%)
  • May42 (8.8%)
  • June35 (7.3%)
  • July42 (8.8%)
  • August60 (13%)
  • September33 (6.9%)
  • October41 (8.6%)
  • November51 (11%)
  • December41 (8.6%)

Light conditions at the time

  • Daylight349 (73%)
  • Dark, street lights lit69 (14%)
  • Dark, no street lighting52 (11%)
  • Dark, street lights unlit5 (1%)
  • Dark, lighting unknown3 (0.6%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4309 crashes

On the B4309, 45% of collisions happened where the speed limit was 30 mph and 54% on a dry road surface.

Speed limit at the scene

  • 20 mph8 (1.7%)
  • 30 mph214 (45%)
  • 40 mph44 (9.2%)
  • 50 mph24 (5%)
  • 60 mph187 (39%)
  • 70 mph1 (0.2%)

Weather at the time

  • Fine, no high winds324 (68%)
  • Raining, no high winds100 (21%)
  • Raining with high winds17 (3.6%)
  • Fog or mist10 (2.1%)
  • Other26 (5.4%)
  • Not recorded1 (0.2%)

Road surface

  • Dry258 (54%)
  • Wet or damp202 (42%)
  • Frost or ice12 (2.5%)
  • Snow4 (0.8%)
  • Flood over 3cm deep1 (0.2%)
  • Oil or diesel1 (0.2%)

Type of road

  • Single carriageway472 (99%)
  • Dual carriageway4 (0.8%)
  • Roundabout1 (0.2%)
  • Not recorded1 (0.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4309 crashes

Car occupants make up 73% of the people killed or injured on the B4309, followed by motorcyclists (9.4%).

Casualties by road user

  • Car occupant511 (73%)
  • Motorcyclist66 (9.4%)
  • Pedestrian51 (7.2%)
  • Van occupant24 (3.4%)
  • Cyclist19 (2.7%)
  • Bus or coach occupant15 (2.1%)
  • Goods vehicle occupant (over 3.5 tonnes)9 (1.3%)
  • Other9 (1.3%)

Vehicles involved

  • Car670 (78%)
  • Motorcycle61 (7.1%)
  • Van or goods vehicle up to 3.5 tonnes42 (4.9%)
  • Goods vehicle over 3.5 tonnes26 (3%)
  • Pedal cycle18 (2.1%)
  • Other vehicle15 (1.7%)
  • Bus or coach10 (1.2%)
  • Other16 (1.9%)

Casualties by age

  • 0 to 521 (3%)
  • 6 to 1022 (3.1%)
  • 11 to 1536 (5.1%)
  • 16 to 20130 (18%)
  • 21 to 2598 (14%)
  • 26 to 35137 (19%)
  • 36 to 4587 (12%)
  • 46 to 5586 (12%)
  • 56 to 6548 (6.8%)
  • 66 to 7524 (3.4%)
  • Over 7513 (1.8%)
  • Not recorded2 (0.3%)

Drivers, passengers and pedestrians

  • Driver or rider452 (64%)
  • Passenger201 (29%)
  • Pedestrian51 (7.2%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4309

Map of the 25 most recent crashes on the B4309

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

  • 25 crashes
  • Serious
  • Slight

B4309 crashes by council area

All 478 collisions on the B4309 were in Carmarthenshire.

Collisions on the B4309 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCarmarthenshire47870411152

B4309 crashes by town

Collisions on the B4309 were recorded in 2 towns and built-up areas, led by Pontyates (88) and Llanelli (63).

Recent crashes on the B4309

These are the 25 most recent collisions on the B4309, from 9 August 2021 to 19 December 2025.

Severity