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CrashStats

A4066 accidents: crash map and statistics

Police recorded 240 collisions on the A4066 from 1979 to 2025, with 362 casualties. Of those crashes, 4 were fatal and 83 serious, and 4 people were killed.

In 2025 there were 5 collisions on the A4066, up 150% from 2 in 2024, with 7 casualties.

Collisions since 1979
240
3,011th highest of 4,923 roads
Casualties
362
1.51 per collision
Fatal collisions
4
4 people killed
Serious collisions
83
117 seriously injured
Collisions in 2025
5
Up 150% on 2024
Casualties in 2025
7
Up 133% on 2024

Crash severity on the A4066

On the A4066, 1.7% of collisions were fatal and 35% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal41.7%
  • Serious8335%
  • Slight15364%

Where the A4066 ranks among 4,923 roads

Most collisions
3,011th
Most casualties
2,866th
Most fatal collisions
2,815th
Most serious collisions
2,219th

A4066 accidents by year

Collisions on the A4066 peaked at 11 in 2000 and were down to 5 in 2025.

Collisions and casualties on the A4066, 1979 to 2025

  • Collisions
  • Collisions in 2025
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202557
202423
202325
202226
202136
202022
201944
201846
201747
201644
201511
201458
201323
201234
201135
201046
200958
2008611
200766
2006611
200546
200468
200369
200256
200144
20001120
199956
1998510
199777
19961015
199559
1994812
19931012
1992818
199157
199056
198956
1988711
198766
198656
198558
1984512
1983810
198269
198155
1980513
197968

When crashes happen on the A4066

Friday has the most collisions on the A4066 (44), and noon to 3pm is the busiest time of day (43).

Collisions by day of the week

  • Monday31 (13%)
  • Tuesday31 (13%)
  • Wednesday30 (13%)
  • Thursday29 (12%)
  • Friday44 (18%)
  • Saturday40 (17%)
  • Sunday35 (15%)

Collisions by time of day

  • Midnight to 3am16 (6.7%)
  • 3am to 6am5 (2.1%)
  • 6am to 9am25 (10%)
  • 9am to noon40 (17%)
  • Noon to 3pm43 (18%)
  • 3pm to 6pm40 (17%)
  • 6pm to 9pm42 (18%)
  • 9pm to midnight29 (12%)

Collisions by month

  • January17 (7.1%)
  • February14 (5.8%)
  • March19 (7.9%)
  • April18 (7.5%)
  • May20 (8.3%)
  • June24 (10%)
  • July27 (11%)
  • August31 (13%)
  • September25 (10%)
  • October18 (7.5%)
  • November17 (7.1%)
  • December10 (4.2%)

Light conditions at the time

  • Daylight170 (71%)
  • Dark, no street lighting46 (19%)
  • Dark, street lights lit22 (9.2%)
  • Dark, street lights unlit1 (0.4%)
  • Not recorded1 (0.4%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4066 crashes

On the A4066, 42% of collisions happened where the speed limit was 30 mph and 59% on a dry road surface.

Speed limit at the scene

  • 20 mph3 (1.3%)
  • 30 mph100 (42%)
  • 40 mph30 (13%)
  • 50 mph7 (2.9%)
  • 60 mph100 (42%)

Weather at the time

  • Fine, no high winds176 (73%)
  • Raining, no high winds39 (16%)
  • Raining with high winds7 (2.9%)
  • Other16 (6.7%)
  • Not recorded2 (0.8%)

Road surface

  • Dry142 (59%)
  • Wet or damp89 (37%)
  • Frost or ice4 (1.7%)
  • Flood over 3cm deep2 (0.8%)
  • Other2 (0.8%)
  • Not recorded1 (0.4%)

Type of road

  • Single carriageway236 (98%)
  • Roundabout2 (0.8%)
  • Not recorded2 (0.8%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4066 crashes

Car occupants make up 77% of the people killed or injured on the A4066, followed by motorcyclists (8.3%).

Casualties by road user

  • Car occupant277 (77%)
  • Motorcyclist30 (8.3%)
  • Pedestrian28 (7.7%)
  • Cyclist13 (3.6%)
  • Van occupant5 (1.4%)
  • Other vehicle occupant3 (0.8%)
  • Goods vehicle occupant (over 3.5 tonnes)2 (0.6%)
  • Other4 (1.1%)

Vehicles involved

  • Car298 (78%)
  • Motorcycle28 (7.3%)
  • Van or goods vehicle up to 3.5 tonnes17 (4.4%)
  • Pedal cycle13 (3.4%)
  • Goods vehicle over 3.5 tonnes10 (2.6%)
  • Bus or coach6 (1.6%)
  • Other vehicle5 (1.3%)
  • Other6 (1.6%)

Casualties by age

  • 0 to 57 (1.9%)
  • 6 to 1024 (6.6%)
  • 11 to 1524 (6.6%)
  • 16 to 20110 (30%)
  • 21 to 2543 (12%)
  • 26 to 3546 (13%)
  • 36 to 4542 (12%)
  • 46 to 5532 (8.8%)
  • 56 to 6518 (5%)
  • 66 to 758 (2.2%)
  • Over 758 (2.2%)

Drivers, passengers and pedestrians

  • Driver or rider209 (58%)
  • Passenger125 (35%)
  • Pedestrian28 (7.7%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4066

Map of the 25 most recent crashes on the A4066

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

  • 25 crashes
  • Serious
  • Slight

A4066 crashes by council area

Of the 240 collisions on the A4066, 238 were in Carmarthenshire.

Collisions on the A4066 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCarmarthenshire238359483

A4066 crashes by town

Of the 240 collisions on the A4066, 30 were in the built-up area of St Clears.

Recent crashes on the A4066

These are the 25 most recent collisions on the A4066, from 22 August 2017 to 1 June 2025.

Severity