There's a witness appeal following a serious collision on the A26 between Rose Hill and Little Horsted near Uckfield.
It happened on Sunday (Aug 7) at around 4.15pm at the junction with Bradfords Lane between a black Audi Q2 and an orange KTM 125 motorcycle.
The rider, a 22-year-old man, was taken to the Royal Sussex County Hospital with serious injuries and remains in a life-threatening condition.
Officers are appealing for witnesses or anyone with relevant footage to come forward.
Anyone who saw or has footage of the vehicles in the area before the incident is also asked to contact us.
Information can be reported online, on 101, or email: [email protected] and quote Operation Rowhill.