58 year old Sarah Evans died after crash on M4.
Sarah was a passenger in a Ford KA when the incident happened on Thursday the 25th of January at 7.10pm.
The car crashed on the eastbound carriageway of the M4 between junctions 46 Llangyfelach and 45 Ynysforgan.
A statement released by police described Mrs Evans as "a loving wife to Steve and mother to Rachel. She lived and loved life to the full. In particular her Tuesday ladies darts team at the Turn style public house in Llanelli.
"Her husband Steve says that she will be sorely missed by her family and circle of many friends. They would also like to thank the off duty police officer and lorry driver for their help at the time of this tragic incident."
The driver of the vehicle was taken to Morriston Hospital for treatment.
Witnesses to the collision should contact 101 quoting occurrence reference 1800030617.