Police are appealing for witnesses following a collision involving a Renault Clio and a Vauxhall Astra on Water Lane, Angmering, around 1am on Friday March 11.
Sussex Police would like to trace a male and a female who left the scene following the incident, as there is concern they may be injured due to the damage caused to their vehicle.
The vehicles have since been recovered from the scene and enquiries are ongoing.
Anyone who knows those involved, or who has any other information including dash cam or video doorbell footage, is urged to report it online or call 101, quoting serial 41 of 11/03.