Police are appealing for witnesses to a serious collision in Walberton, Arundel.
Emergency services responded to a collision involving a delivery van and a pedestrian in Church Lane, just before 2.30pm on Tuesday.
The pedestrian, a 75-year-old woman, was airlifted to hospital with serious injuries.
The van, a Fiat Ducato, was being driven by a 38-year-old man. He was unhurt.
Anyone with information is asked to email collision.appeal@sussex.pnn.police.uk or call 101 quoting Operation Op Longshore.