Avon and Somerset Police are asking for help from the public to trace a woman who stopped and spoke to ambulance crew at the scene of a collision in Warmley last week.
It happened at 5.25pm on Thursday 21st June on the A420 London Road at the junction with Station Road.
A teenage pedestrian was involved in a low-speed collision with a car.
Ambulance crews attended and the 16-year-old boy was taken to hospital and released the same day after treatment to cuts and bruises.
The driver was spoken to by officers at the time.
PC 2051 Russell Tucker said: “A lady stopped at the scene and spoke to the ambulance crew, however she did not leave her details.
“We’d really like to speak to her or anyone else who witnessed this incident.”
Anyone who can help is asked to get in touch online, or by calling 101, quoting reference 869 of 21st June.