Officers would like to speak to the driver or passengers of a small dark coloured vehicle which was travelling on the A29 at Fairmile Bottom, near Slindon, around 2.57pm on Wednesday (14 October).
Police believe the occupants of the vehicle may have witnessed a collision between a black Aprilia motorcycle and a silver Vauxhall Vectra which were both travelling northeast towards Whiteways Roundabout. The Aprilia then collided into a Ford Transit which was parked in a layby on the opposite carriageway.