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CrashStats

Serious A4138 crash in Carmarthenshire on 6 December 2025 at 21:17 involving a Sinnis ZS 125 motorcycle

A car and a Sinnis ZS 125 motorcycle were involved in a crash on the A4138 in Carmarthenshire at 21:17 on Saturday 6 December 2025. The 38-year-old male driver of the car was seriously injured and the 41-year-old male rider of the Sinnis ZS 125 motorcycle was slightly injured.

It happened after dark under street lighting in fine weather on a wet dual carriageway with a 40 mph limit, at a crossroads.

Severity
Serious
Date
6 Dec 2025
Saturday, 21:17
Vehicles
2
Car and Sinnis ZS 125
Casualties
2
1 seriously injured, 1 slightly injured

Location of the crash

Police recorded the crash at latitude 51.68263, longitude -4.13364, in the SA15 postcode district and within the built-up area of Llanelli. It is one of the crashes that make up the Bigyn, Carmarthenshire, SA14 9WB area accident hotspot.

Map of where the crash happened in Carmarthenshire

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  • 1 crash
  • Serious

Collision details

Basic information

Reference
2025631679368
Council area
Carmarthenshire
Police force
Dyfed-Powys
Police attended the scene
Yes

Road and location details

First road class
A
First road number
4138
Road type
Dual carriageway
Speed limit
40 mph
Urban or rural
Urban

Junction information

Junction type
Crossroads
Junction control
Auto traffic signal
Second road class
Unclassified

Pedestrian crossing information

Crossing facilities
Pedestrian light crossing (pelican or puffin or toucan or similar)

Environmental conditions

Light conditions
Dark, street lights lit
Weather
Fine, no high winds
Road surface
Wet or damp

Enhanced collision data

Serious injury band
Very serious
How severity was recorded
From injuries recorded by police (CRASH system)
Estimated chance it was serious
100%
Estimated chance it was slight
0%

The 6 nearest recorded crashes

The nearest, 3 metres away, was a slight injury crash on 1 February 2001.

Vehicles involved (2)

  • Vehicle 1: Car

    Manoeuvre
    Going ahead
    Travelling from
    South
    Travelling to
    North East
    Position at junction
    Mid-junction, on roundabout or on main road
    Hit object in carriageway
    Bollard or refuge
    Leaving the carriageway
    Offside onto central reservation
    Hit object off carriageway
    Central crash barrier
    First point of impact
    Front
    Left-hand drive
    No
    Journey purpose
    Personal business or leisure
    Driver sex
    Male
    Driver age
    38 years
    Engine capacity
    1,368 cc
    Fuel or propulsion
    Petrol
    Driver home area deprivation
    10% most deprived
    Distance from driver's home
    Within 5 km

  • Vehicle 2: Sinnis ZS 125

    Motorcycle 125cc and under

    Manoeuvre
    Going ahead
    Travelling from
    West
    Travelling to
    East
    Position at junction
    Entering main road
    First point of impact
    Offside
    Left-hand drive
    No
    Journey purpose
    Commuting to or from work
    Driver sex
    Male
    Driver age
    41 years
    Engine capacity
    125 cc
    Fuel or propulsion
    Petrol
    Driver home area deprivation
    10 to 20% most deprived
    Distance from driver's home
    Within 5 km

Casualties (2)

  • Casualty 1: Driver

    Serious

    Male, aged 38, car occupant, in vehicle 1 (Car)

    Serious injury band
    Very serious
    Home area deprivation
    10% most deprived
    Distance from home
    Within 5 km

  • Casualty 2: Rider

    Slight

    Male, aged 41, motorcyclist (125cc and under), on vehicle 2 (Sinnis ZS 125)

    Home area deprivation
    10 to 20% most deprived
    Distance from home
    Within 5 km

Data source

This record comes from the Department for Transport’s road safety data (STATS19), in which police forces in Great Britain record every road crash reported to them where someone was injured. It is reference 2025631679368 in the data published on GOV.UK under the Open Government Licence v3.0, and one of the crashes counted in the Carmarthenshire road accident statistics for 2025.