Appeal for dash cam footage following fatal M4 collision

At approximately 4.35pm on Thursday, 21st June 2018, we were called to reports of a road traffic collision involving three vehicles on the M4 Eastbound carriageway, between junctions 29 and 28.
A red Honda 4x4, black Perodua and silver Audi A6 were involved in the collision. The male driver of the Perodua suffered serious injuries and died at the scene.  
A 60-year-old man from Buckinghamshire, who was driving the Honda vehicle, was arrested on suspicion of causing death by dangerous driving and remains in custody at this time.
Specialist officers are supporting the family of the deceased.
Investigations are ongoing into the incident. Officers would be particularly interested in hearing for motorists with dash cam footage of the incident.
Any witnesses are asked to contact Gwent Police on 101, quoting log 358 of 21/6/18.