A woman remains in hospital following a crash near Bognor. Officers were called to a two-vehicle collision on the B2166 in Lower Bognor Road in Aldwick at around 1:20pm last Saturday.
The collision involved a black Audi A3 and a silver Vauxhall Astra.
The driver of the Audi, an 81-year-old woman, sustained serious injuries - The driver of the Vauxhall, a 43-year-old man, was not seriously injured.
Anyone who saw what happened is asked to contact police.
This includes anyone with CCTV, doorbell or dashcam footage of the vehicles in the area at the time.
Information can be reported to Sussex Police online or by calling 101 and quoting serial 539 of 11/01.