Police are appealing for witnesses or dashcam footage after a collision between a black Honda motorcycle and a small white Volkswagen van in Shoreham.
It happened on the westbound carriageway at Old Shoreham Road, between Aldrington Avenue and St. Josephs Close, on February 17.
Police are hoping the public can help with their ongoing investigation.
Anyone with any information or who may have captured any relevant dashcam footage is urged to contact the collisions unit via emailing collisions.unit@sussex.police.uk, quoting reference 0483 from 17/02.