Police want to find out what happened before a car crashed and burst into flames near Arundel, killing its driver.
The victim was driving a blue Vauxhall eastbound on the A27 at Hammerpot Hill when it left the road, flipped over and caught fire at about 5.15pm on Thursday (30 July).
Despite the efforts of the emergency services, the driver of the vehicle — a man in his 20s — lost his life at the scene.
Next of kin have been informed.
No other vehicle was involved in the incident.
Officers said they would like to hear from anyone who saw what happened and in particular anyone who has any dash cam footage.
Investigators requested information either to the 101 telephone number, or by or emailing [email protected] quoting "Operation Custom".