Police are appealing for witnesses and information after a serious collision near Hailsham.
Emergency services were called to the A267 North Street, shortly after 1pm on Sunday, 11 May.
The collision is believed to have involved three vehicles, a silver Land Rover Discovery, a green Land Rover Discovery, and a Mercedes, between the junctions with the B2104 and Church Lane.
A 27-year-old man from Hellingly sustained serious injuries and remains in hospital.
A 28-year-old man from Hailsham was arrested on suspicion of causing serious injury by dangerous driving, and has been bailed, pending further enquiries.
Officers are investigating the collision, and have appealed for witnesses or anyone with information to come forward.
This includes anyone in the area at the time with dashcam footage of the vehicles.
Information can be reported to Sussex Police online, by calling 101, or email: collision.appeal@sussex.police.uk and quote Operation Portree.
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