A 90-year-old Brighton pensioners suffered a broken leg when he was involved in an accident with a 23-year-old scooter rider.
Sussex Police said that a driver in the area – in Roedean Road – was thought to be a witness and officers wanted to trace whoever was behind the wheel.
The force said: “The driver of a blue Ford Kuga car, known to have been near by when a scooter and a pedestrian were in collision in Brighton on Thursday morning (23 August), may be a key witness to the incident.
“It resulted in the pedestrian, a 90-year-old local man, sustaining a broken leg and being detained for treatment at the Royal Sussex County Hospital, Brighton.
“The rider of the Yamaha scooter, a 23-year-old man from Newhaven, was unhurt.
“He had been travelling east on the B2118 Roedean Road when the collision occurred near the roundabout junction with Whitehawk Road.
“Investigators would like to hear from anyone who saw what happened but particularly the Kuga driver or any passengers.
“They are asked to contact Sussex Police online or call 101, quoting serial 412 of 23/08.”