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CrashStats

A4138 accidents: crash map and statistics

Police recorded 681 collisions on the A4138 from 1979 to 2025, with 1,047 casualties. Of those crashes, 13 were fatal and 182 serious, and 16 people were killed.

In 2025 there were 15 collisions on the A4138, up 50% from 10 in 2024, with 18 casualties.

Collisions since 1979
681
1,533rd highest of 4,923 roads
Casualties
1,047
1.54 per collision
Fatal collisions
13
16 people killed
Serious collisions
182
246 seriously injured
Collisions in 2025
15
Up 50% on 2024
Casualties in 2025
18
Down 10% on 2024

Crash severity on the A4138

On the A4138, 1.9% of collisions were fatal and 27% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal131.9%
  • Serious18227%
  • Slight48671%

Where the A4138 ranks among 4,923 roads

Most collisions
1,533rd
Most casualties
1,380th
Most fatal collisions
1,413th
Most serious collisions
1,155th

A4138 accidents by year

Collisions on the A4138 peaked at 26 in 1979 and were down to 15 in 2025.

Collisions and casualties on the A4138, 1979 to 2025

  • Collisions
  • Collisions in 2025: 15
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251518
20241020
2023712
2022814
20211216
20201013
20191115
2018914
2017813
201679
20151216
20141518
20131216
20121622
20111316
20101530
20091325
20081019
2007916
20061119
20051621
20041527
20032136
20022333
20012133
20001927
19992132
19982236
19971627
19961221
19951426
19942128
19931222
19921630
19911724
19902234
19891216
19881319
19871223
19862436
19851116
19841012
19831418
19821729
19811624
19801518
19792638

When crashes happen on the A4138

Friday has the most collisions on the A4138 (112), and 3pm to 6pm is the busiest time of day (171).

Collisions by day of the week

  • Monday96 (14%)
  • Tuesday109 (16%)
  • Wednesday105 (15%)
  • Thursday97 (14%)
  • Friday112 (16%)
  • Saturday96 (14%)
  • Sunday66 (9.7%)

Collisions by time of day

  • Midnight to 3am19 (2.8%)
  • 3am to 6am14 (2.1%)
  • 6am to 9am101 (15%)
  • 9am to noon105 (15%)
  • Noon to 3pm122 (18%)
  • 3pm to 6pm171 (25%)
  • 6pm to 9pm87 (13%)
  • 9pm to midnight62 (9.1%)

Collisions by month

  • January57 (8.4%)
  • February51 (7.5%)
  • March58 (8.5%)
  • April46 (6.8%)
  • May66 (9.7%)
  • June48 (7%)
  • July45 (6.6%)
  • August34 (5%)
  • September65 (9.5%)
  • October51 (7.5%)
  • November72 (11%)
  • December88 (13%)

Light conditions at the time

  • Daylight497 (73%)
  • Dark, street lights lit154 (23%)
  • Dark, no street lighting18 (2.6%)
  • Dark, lighting unknown5 (0.7%)
  • Dark, street lights unlit5 (0.7%)
  • Not recorded2 (0.3%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4138 crashes

On the A4138, 39% of collisions happened where the speed limit was 30 mph and 60% on a dry road surface.

Speed limit at the scene

  • 20 mph3 (0.4%)
  • 30 mph268 (39%)
  • 40 mph210 (31%)
  • 50 mph5 (0.7%)
  • 60 mph192 (28%)
  • 70 mph3 (0.4%)

Weather at the time

  • Fine, no high winds498 (73%)
  • Raining, no high winds122 (18%)
  • Raining with high winds18 (2.6%)
  • Fine with high winds7 (1%)
  • Other31 (4.6%)
  • Not recorded5 (0.7%)

Road surface

  • Dry410 (60%)
  • Wet or damp260 (38%)
  • Frost or ice8 (1.2%)
  • Snow1 (0.1%)
  • Not recorded2 (0.3%)

Type of road

  • Single carriageway524 (77%)
  • Roundabout73 (11%)
  • Dual carriageway68 (10%)
  • One way street or slip road16 (2.3%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4138 crashes

Car occupants make up 76% of the people killed or injured on the A4138, followed by motorcyclists (7.8%).

Casualties by road user

  • Car occupant798 (76%)
  • Motorcyclist82 (7.8%)
  • Pedestrian79 (7.5%)
  • Cyclist33 (3.2%)
  • Van occupant24 (2.3%)
  • Goods vehicle occupant (over 3.5 tonnes)14 (1.3%)
  • Bus or coach occupant7 (0.7%)
  • Other10 (1%)

Vehicles involved

  • Car1,112 (80%)
  • Motorcycle78 (5.6%)
  • Goods vehicle over 3.5 tonnes72 (5.2%)
  • Van or goods vehicle up to 3.5 tonnes61 (4.4%)
  • Pedal cycle34 (2.4%)
  • Taxi or private hire car13 (0.9%)
  • Bus or coach11 (0.8%)
  • Other15 (1.1%)

Casualties by age

  • 0 to 513 (1.2%)
  • 6 to 1032 (3.1%)
  • 11 to 1548 (4.6%)
  • 16 to 20162 (15%)
  • 21 to 25124 (12%)
  • 26 to 35183 (17%)
  • 36 to 45162 (15%)
  • 46 to 55117 (11%)
  • 56 to 65101 (9.6%)
  • 66 to 7568 (6.5%)
  • Over 7534 (3.2%)
  • Not recorded3 (0.3%)

Drivers, passengers and pedestrians

  • Driver or rider664 (63%)
  • Passenger304 (29%)
  • Pedestrian79 (7.5%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4138

Map of the 25 most recent crashes on the A4138

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

A4138 crashes by council area

Collisions on the A4138 were recorded in 2 council areas. Carmarthenshire has the most, with 669, followed by Swansea (10).

Collisions on the A4138 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCarmarthenshire6691,03013179
2ndSwansea101502

A4138 crashes by town

Collisions on the A4138 were recorded in 4 towns and built-up areas, led by Llanelli (195) and Hendy and Fforest (104).

Recent crashes on the A4138

These are the 25 most recent collisions on the A4138, from 18 January 2024 to 20 December 2025.

Severity