Police are appealing for witnesses and relevant CCTV or dashcam footage after a collision in Crawley.
The collision involving a white van and a motorcycle happened between 6.30pm and 7pm on May 4 in Haslett Avenue East.
It happened near the turn-off near Hawth Avenue on the roundabout, also known locally as the “Square-about”.
The van did not remain at the scene after the collision.
The motorcycle rider, a 58-year-old man from Crawley, sustained serious but not life-threatening injuries and was taken to hospital.
Officers investigating want anyone who saw the vehicles travelling west along Haslett Avenue East towards the roundabout to come forward.
It is understood the two vehicles had both travelled along Haslett Avenue East from the traffic lights at Stephenson Way before approaching the roundabout.
Witnesses or anyone with relevant CCTV or dashcam footage of the vehicles in the area at the time is asked to report it to the police.
Information can be reported to Sussex Police online or by emailing [email protected] and quote serial 1258 of 04/05.
A 21-year-old man from Horsham was arrested on suspicion of causing grievous bodily harm and dangerous driving, and has been bailed, pending further enquiries.