South Wales Police are appealing for witnesses.
A 54 year old man has died after an incident on the M4 off slip at junction 45, Ynysforgan.
A silver coloured Mercedes SLK 200 was involved in the collision.
The incident occured at around 19:05hrs last night.
The motorway was closed between junction 46 and 45 for approximately 6 hours to allow for investigation work to be carried out.
The Police would like to thank the community for their patience and understanding during this time.
South Wales Police would like to speak with any witnesses to the collision, any person who may have dash cam footage of the incident or anyone who witnessed the manner of driving of the Mercedes SLK 200 prior to the collision.
Please could witnesses contact the Roads Policing Unit at Lakeside Police Station on Tel : 101 quoting occurrence 1900032991.