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CrashStats

B4311 accidents: crash map and statistics

Police recorded 101 collisions on the B4311 from 1979 to 2025, with 130 casualties. Of those crashes, 5 were fatal and 30 serious, and 5 people were killed.

In 2025 there was 1 collision on the B4311, down 67% from 3 in 2024, with 1 casualty.

Collisions since 1979
101
4,026th highest of 4,923 roads
Casualties
130
1.29 per collision
Fatal collisions
5
5 people killed
Serious collisions
30
34 seriously injured
Collisions in 2025
1
Down 67% on 2024
Casualties in 2025
1
Down 75% on 2024

Crash severity on the B4311

On the B4311, 5% of collisions were fatal and 30% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal55%
  • Serious3030%
  • Slight6665%

Where the B4311 ranks among 4,923 roads

Most collisions
4,026th
Most casualties
4,074th
Most fatal collisions
2,545th
Most serious collisions
3,619th

B4311 accidents by year

Collisions on the B4311 peaked at 8 in 2007 and were down to 1 in 2025.

Collisions and casualties on the B4311, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202434
202300
202222
202100
202011
201933
201812
201712
201600
201511
201413
201300
201211
201111
201034
200911
200835
200788
200626
200522
200423
200333
200200
200122
200045
199900
199811
199700
199611
199522
199411
199311
199222
1991511
199034
198968
198868
198733
198611
198511
198433
198312
198267
198145
198067
197922

When crashes happen on the B4311

Saturday has the most collisions on the B4311 (28), and 3pm to 6pm is the busiest time of day (24).

Collisions by day of the week

  • Monday14 (14%)
  • Tuesday11 (11%)
  • Wednesday15 (15%)
  • Thursday11 (11%)
  • Friday12 (12%)
  • Saturday28 (28%)
  • Sunday10 (9.9%)

Collisions by time of day

  • Midnight to 3am4 (4%)
  • 3am to 6am2 (2%)
  • 6am to 9am5 (5%)
  • 9am to noon15 (15%)
  • Noon to 3pm17 (17%)
  • 3pm to 6pm24 (24%)
  • 6pm to 9pm18 (18%)
  • 9pm to midnight16 (16%)

Collisions by month

  • January4 (4%)
  • February12 (12%)
  • March8 (7.9%)
  • April11 (11%)
  • May6 (5.9%)
  • June7 (6.9%)
  • July6 (5.9%)
  • August8 (7.9%)
  • September11 (11%)
  • October9 (8.9%)
  • November11 (11%)
  • December8 (7.9%)

Light conditions at the time

  • Daylight69 (68%)
  • Dark, street lights lit30 (30%)
  • Dark, no street lighting1 (1%)
  • Dark, street lights unlit1 (1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4311 crashes

On the B4311, 92% of collisions happened where the speed limit was 30 mph and 66% on a dry road surface.

Speed limit at the scene

  • 20 mph2 (2%)
  • 30 mph93 (92%)
  • 40 mph4 (4%)
  • 60 mph2 (2%)

Weather at the time

  • Fine, no high winds77 (76%)
  • Raining, no high winds14 (14%)
  • Raining with high winds6 (5.9%)
  • Fine with high winds1 (1%)
  • Other3 (3%)

Road surface

  • Dry67 (66%)
  • Wet or damp34 (34%)

Type of road

  • Single carriageway94 (93%)
  • Dual carriageway3 (3%)
  • Roundabout2 (2%)
  • One way street or slip road1 (1%)
  • Not recorded1 (1%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4311 crashes

Car occupants make up 44% of the people killed or injured on the B4311, followed by pedestrians (25%).

Casualties by road user

  • Car occupant57 (44%)
  • Pedestrian32 (25%)
  • Motorcyclist29 (22%)
  • Cyclist9 (6.9%)
  • Bus or coach occupant2 (1.5%)
  • Minibus occupant1 (0.8%)

Vehicles involved

  • Car117 (71%)
  • Motorcycle28 (17%)
  • Pedal cycle9 (5.5%)
  • Bus or coach4 (2.4%)
  • Van or goods vehicle up to 3.5 tonnes3 (1.8%)
  • Goods vehicle over 3.5 tonnes1 (0.6%)
  • Minibus1 (0.6%)
  • Other2 (1.2%)

Casualties by age

  • 0 to 54 (3.1%)
  • 6 to 108 (6.2%)
  • 11 to 1510 (7.7%)
  • 16 to 2038 (29%)
  • 21 to 2518 (14%)
  • 26 to 3511 (8.5%)
  • 36 to 4512 (9.2%)
  • 46 to 557 (5.4%)
  • 56 to 659 (6.9%)
  • 66 to 7511 (8.5%)
  • Over 752 (1.5%)

Drivers, passengers and pedestrians

  • Driver or rider71 (55%)
  • Pedestrian32 (25%)
  • Passenger27 (21%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4311

Map of the 25 most recent crashes on the B4311

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B4311 crashes by council area

Of the 101 collisions on the B4311, 100 were in Carmarthenshire.

Collisions on the B4311 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCarmarthenshire100129530

B4311 crashes by town

Collisions on the B4311 were recorded in 2 towns and built-up areas, led by Burry Port (47) and Pembrey (18).

Recent crashes on the B4311

These are the 25 most recent collisions on the B4311, from 13 September 2007 to 24 September 2025.

Severity