A woman travelling with three men has been left by them to die on the side of the road after their car crashed into a power pole in western Sydney.
Believed to be in her 30s, the woman was in the car with three young men, when they crashed into a concrete traffic island and then a power pole in Chester Hill about 6.30am Saturday.
The men fled the area after pulling her from the wreckage and leaving her by the side of the road to die, chief inspector Phillip Brooks said.
"For these three young males to be involved in this crash, to pull this young woman out of the car and then leave her to die by the side of the road is certainly a very significant factor in this very sad and tragic event," he said.
"It's a clear lack of personal responsibility which is costing lives on NSW roads."
Speed is believed to be a factor in the crash, Insp Brooks said.
A large amount of paint was located at the scene, suggesting the men, who are still at large, are tradesmen.
"It's quite obvious that a significant amount of paint was left on the roadway after this crash and potentially these people are involved in the painting trade," Insp Brooks said.
"The driver knows who they are and they are compelled to attend the nearest police station and present themselves to police."
Uber driver Danish Umer, who witnessed the crash and pulled over to help the woman, said one of the men tried to stop him.
"One of the guys tried to hold my hand and tried to stop me to call the police or paramedics," he told the Seven Network.
"I tried my best to save the lady but she was dead."