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CrashStats

B4303 accidents: crash map and statistics

Police recorded 121 collisions on the B4303 from 1979 to 2025, with 174 casualties. Of those crashes, 1 was fatal and 35 serious, and 1 person was killed.

In 2025 there was 1 collision on the B4303, level with 2024, with 1 casualty.

Collisions since 1979
121
3,837th highest of 4,923 roads
Casualties
174
1.44 per collision
Fatal collisions
1
1 person killed
Serious collisions
35
40 seriously injured
Collisions in 2025
1
Level with 2024
Casualties in 2025
1
Level with 2024

Crash severity on the B4303

On the B4303, 0.8% of collisions were fatal and 29% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal10.8%
  • Serious3529%
  • Slight8570%

Where the B4303 ranks among 4,923 roads

Most collisions
3,837th
Most casualties
3,778th
Most fatal collisions
3,933rd
Most serious collisions
3,440th

B4303 accidents by year

Collisions on the B4303 peaked at 8 in 1988 and were down to 1 in 2025.

Collisions and casualties on the B4303, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202411
202311
202211
202111
202033
201900
201835
201723
201634
201568
201411
201335
201212
201111
201037
200911
200811
200734
200622
200535
200400
200300
200257
200122
200023
199911
199822
199723
199622
199549
1994610
199300
199200
199138
199011
198923
1988811
198700
198655
1985511
198445
198344
198255
198169
1980811
197935

When crashes happen on the B4303

Wednesday has the most collisions on the B4303 (28), and 3pm to 6pm is the busiest time of day (31).

Collisions by day of the week

  • Monday13 (11%)
  • Tuesday20 (17%)
  • Wednesday28 (23%)
  • Thursday18 (15%)
  • Friday21 (17%)
  • Saturday13 (11%)
  • Sunday8 (6.6%)

Collisions by time of day

  • Midnight to 3am4 (3.3%)
  • 3am to 6am3 (2.5%)
  • 6am to 9am18 (15%)
  • 9am to noon9 (7.4%)
  • Noon to 3pm22 (18%)
  • 3pm to 6pm31 (26%)
  • 6pm to 9pm22 (18%)
  • 9pm to midnight12 (9.9%)

Collisions by month

  • January13 (11%)
  • February12 (9.9%)
  • March11 (9.1%)
  • April4 (3.3%)
  • May10 (8.3%)
  • June14 (12%)
  • July8 (6.6%)
  • August4 (3.3%)
  • September14 (12%)
  • October6 (5%)
  • November15 (12%)
  • December10 (8.3%)

Light conditions at the time

  • Daylight78 (64%)
  • Dark, street lights lit43 (36%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4303 crashes

On the B4303, 93% of collisions happened where the speed limit was 30 mph and 64% on a dry road surface.

Speed limit at the scene

  • 20 mph6 (5%)
  • 30 mph113 (93%)
  • 40 mph1 (0.8%)
  • 60 mph1 (0.8%)

Weather at the time

  • Fine, no high winds88 (73%)
  • Raining, no high winds19 (16%)
  • Fine with high winds2 (1.7%)
  • Fog or mist1 (0.8%)
  • Other7 (5.8%)
  • Not recorded4 (3.3%)

Road surface

  • Dry78 (64%)
  • Wet or damp42 (35%)
  • Frost or ice1 (0.8%)

Type of road

  • Single carriageway107 (88%)
  • Roundabout12 (9.9%)
  • Dual carriageway1 (0.8%)
  • Not recorded1 (0.8%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4303 crashes

Car occupants make up 53% of the people killed or injured on the B4303, followed by pedestrians (16%).

Casualties by road user

  • Car occupant93 (53%)
  • Pedestrian27 (16%)
  • Motorcyclist25 (14%)
  • Cyclist18 (10%)
  • Bus or coach occupant4 (2.3%)
  • Van occupant3 (1.7%)
  • Taxi or private hire car occupant2 (1.1%)
  • Other2 (1.1%)

Vehicles involved

  • Car162 (71%)
  • Motorcycle25 (11%)
  • Pedal cycle18 (7.9%)
  • Van or goods vehicle up to 3.5 tonnes8 (3.5%)
  • Goods vehicle over 3.5 tonnes7 (3.1%)
  • Bus or coach4 (1.7%)
  • Other vehicle3 (1.3%)
  • Taxi or private hire car2 (0.9%)

Casualties by age

  • 0 to 53 (1.7%)
  • 6 to 1012 (6.9%)
  • 11 to 1516 (9.2%)
  • 16 to 2026 (15%)
  • 21 to 2533 (19%)
  • 26 to 3528 (16%)
  • 36 to 4520 (11%)
  • 46 to 5517 (9.8%)
  • 56 to 6511 (6.3%)
  • 66 to 753 (1.7%)
  • Over 755 (2.9%)

Drivers, passengers and pedestrians

  • Driver or rider112 (64%)
  • Passenger35 (20%)
  • Pedestrian27 (16%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4303

Map of the 24 most recent crashes on the B4303

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

  • 24 crashes
  • Fatal
  • Serious
  • Slight

B4303 crashes by council area

All 121 collisions on the B4303 were in Carmarthenshire.

Collisions on the B4303 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCarmarthenshire121174135

B4303 crashes by town

Of the 121 collisions on the B4303, 114 were in the built-up area of Llanelli.

Recent crashes on the B4303

These are the 25 most recent collisions on the B4303, from 29 June 2013 to 3 May 2025.

Severity