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CrashStats

B4300 accidents: crash map and statistics

Police recorded 215 collisions on the B4300 from 1979 to 2025, with 359 casualties. Of those crashes, 4 were fatal and 57 serious, and 4 people were killed.

In 2025 there was 1 collision on the B4300, down 83% from 6 in 2024, with 1 casualty.

Collisions since 1979
215
3,152nd highest of 4,923 roads
Casualties
359
1.67 per collision
Fatal collisions
4
4 people killed
Serious collisions
57
96 seriously injured
Collisions in 2025
1
Down 83% on 2024
Casualties in 2025
1
Down 91% on 2024

Crash severity on the B4300

On the B4300, 1.9% of collisions were fatal and 27% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal41.9%
  • Serious5727%
  • Slight15472%

Where the B4300 ranks among 4,923 roads

Most collisions
3,152nd
Most casualties
2,882nd
Most fatal collisions
2,815th
Most serious collisions
2,775th

B4300 accidents by year

Collisions on the B4300 peaked at 10 in 1979 and were down to 1 in 2025.

Collisions and casualties on the B4300, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
2024611
202335
202269
202136
202011
201933
201811
201735
201623
201536
201422
201344
201222
201156
2010915
200979
2008816
200759
200633
2005511
2004712
200348
200234
200112
200069
1999712
1998810
199736
199644
199569
1994922
1993613
199246
199156
1990713
198949
1988616
1987719
198644
198556
1984813
198336
198225
198100
198044
19791013

When crashes happen on the B4300

Friday has the most collisions on the B4300 (43), and 3pm to 6pm is the busiest time of day (61).

Collisions by day of the week

  • Monday24 (11%)
  • Tuesday27 (13%)
  • Wednesday32 (15%)
  • Thursday32 (15%)
  • Friday43 (20%)
  • Saturday36 (17%)
  • Sunday21 (9.8%)

Collisions by time of day

  • Midnight to 3am9 (4.2%)
  • 3am to 6am3 (1.4%)
  • 6am to 9am17 (7.9%)
  • 9am to noon39 (18%)
  • Noon to 3pm34 (16%)
  • 3pm to 6pm61 (28%)
  • 6pm to 9pm32 (15%)
  • 9pm to midnight20 (9.3%)

Collisions by month

  • January21 (9.8%)
  • February13 (6%)
  • March17 (7.9%)
  • April14 (6.5%)
  • May17 (7.9%)
  • June17 (7.9%)
  • July20 (9.3%)
  • August20 (9.3%)
  • September17 (7.9%)
  • October23 (11%)
  • November14 (6.5%)
  • December22 (10%)

Light conditions at the time

  • Daylight158 (73%)
  • Dark, no street lighting43 (20%)
  • Dark, street lights lit13 (6%)
  • Not recorded1 (0.5%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4300 crashes

On the B4300, 76% of collisions happened where the speed limit was 60 mph and 53% on a dry road surface.

Speed limit at the scene

  • 20 mph2 (0.9%)
  • 30 mph20 (9.3%)
  • 40 mph22 (10%)
  • 50 mph6 (2.8%)
  • 60 mph164 (76%)
  • 70 mph1 (0.5%)

Weather at the time

  • Fine, no high winds155 (72%)
  • Raining, no high winds32 (15%)
  • Fog or mist5 (2.3%)
  • Raining with high winds5 (2.3%)
  • Other14 (6.5%)
  • Not recorded4 (1.9%)

Road surface

  • Dry114 (53%)
  • Wet or damp87 (40%)
  • Frost or ice10 (4.7%)
  • Flood over 3cm deep1 (0.5%)
  • Other2 (0.9%)
  • Not recorded1 (0.5%)

Type of road

  • Single carriageway210 (98%)
  • Roundabout3 (1.4%)
  • One way street or slip road2 (0.9%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4300 crashes

Car occupants make up 77% of the people killed or injured on the B4300, followed by motorcyclists (7.8%).

Casualties by road user

  • Car occupant275 (77%)
  • Motorcyclist28 (7.8%)
  • Pedestrian18 (5%)
  • Van occupant14 (3.9%)
  • Taxi or private hire car occupant7 (1.9%)
  • Cyclist6 (1.7%)
  • Goods vehicle occupant (over 3.5 tonnes)6 (1.7%)
  • Other5 (1.4%)

Vehicles involved

  • Car278 (75%)
  • Motorcycle25 (6.8%)
  • Van or goods vehicle up to 3.5 tonnes23 (6.2%)
  • Goods vehicle over 3.5 tonnes13 (3.5%)
  • Bus or coach7 (1.9%)
  • Other vehicle7 (1.9%)
  • Pedal cycle7 (1.9%)
  • Other9 (2.4%)

Casualties by age

  • 0 to 56 (1.7%)
  • 6 to 1010 (2.8%)
  • 11 to 1515 (4.2%)
  • 16 to 2098 (27%)
  • 21 to 2536 (10%)
  • 26 to 3547 (13%)
  • 36 to 4547 (13%)
  • 46 to 5546 (13%)
  • 56 to 6518 (5%)
  • 66 to 7521 (5.8%)
  • Over 7514 (3.9%)
  • Not recorded1 (0.3%)

Drivers, passengers and pedestrians

  • Driver or rider221 (62%)
  • Passenger120 (33%)
  • Pedestrian18 (5%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4300

Map of the 24 most recent crashes on the B4300

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

  • 24 crashes
  • Serious
  • Slight

B4300 crashes by council area

Of the 215 collisions on the B4300, 212 were in Carmarthenshire.

Collisions on the B4300 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCarmarthenshire212352455

B4300 crashes by town

Of the 215 collisions on the B4300, 18 were in the built-up area of Carmarthen.

Recent crashes on the B4300

These are the 25 most recent collisions on the B4300, from 18 December 2017 to 21 August 2025.

Severity