Campbelltown Police are calling on the public to come forward if they witnessed a an accident in Minto last month.
Officers are investigating the circumstances around a crash where a man was seriously injured by his own four-wheel drive after it was struck from behind by another car.
The incident happened about 4.20pm on Friday, June 19. A 48-year-old man was driving a white Toyota Landcruiser on Ben Lomond Drive, Minto, when the vehicle broke down.
As the man was looking under the car's bonnet, a silver Toyota Corolla sedan driven by a 26-year-old woman crashed into the rear of the Landcruiser.
The impact caused the Landcruiser to mount the kerb and careen into a roadside barrier, pinning its driver.
The man suffered multiple fractures to his face and ribs and was taken to Liverpool Hospital for treatment.
The Corolla driver was taken to Campbelltown Hospitla with chest injuries.
As police continue their inquiries, investigating officers want to speak to anyone who may have witnessed the crash.
They are particularly interested in speaking with the driver of a Ford Mustang, who stopped and blocked traffic until police arrived.
Investigators believe at least three other vehicles stopped to assist a the scene, and may have witnessed the crash.
Those vehicles are described as a white van with a ladder strapped to the roof, a Ford utility with a trap top and a Kia four-wheel drive.
Anyone who witnessed the crash that has not already spoken with police, or anyone with dash-cam footage of the incident which might assist police with their investigation, is urged to contact Crime Stoppers on 1800 333 000.