According to Sussex Police, officers were called to A259 Rowan Way, around 5.10pm last Thursday evening (November 12) to reports of a collision between a black BMW 1 car and a motorbike at the junction of Ash Grove.
The 29-year-old man who was riding the motorbike was treated at hospital for his injuries, police said.
In a fresh appeal today (Friday, November 20), PC Mark Gregory, of the Surrey and Sussex Road Policing Unit, said; "The BMW left the scene eastbound after the collision, and enquiries are ongoing to locate the driver.
"Anyone with any information, or who saw what happened, especially if they have any dashcam footage, is asked to us via [email protected] or by calling 101 quoting serial 1105 of 12/11."
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