The incident took place on the eastbound carriageway near Membury Services in West Berkshire at around 8.54am on August 6, and involved a pedestrian and a heavy goods vehicle (HGV). The man was pronounced dead at the scene after he suffered fatal injuries. Detective Sergeant Dominique Roe said: "Our thoughts remain with the family and friends of the man who has sadly died. Thames Valley Police has urged anyone with dashcam footage or information to contact the force, quoting reference 43260405614. The public was advised to avoid the route and seek alternative travel options due to significant delays and heavy traffic in the area.