Woman critical after Sydney hit and run

A 20-year-old woman is fighting for life in a south Sydney hospital after being struck by a ute which ran a red light before leaving the scene.

The woman was crossing Woodville Road at the intersection of Tangerine Street in Villawood about 9.30pm on Thursday when she was struck by the four-door ute, NSW Police say.

The driver left the scene without stopping while the woman suffered serious head and leg injuries. She remains at Liverpool Hospital in a critical condition.

The woman had a green pedestrian signal when she was crossing, Detective Assistant Inspector Naomi Earle told reporters in Sydney on Friday.

"She had right of way so it appears the alleged driver has run a red light," Insp Earle said.

Police are urging anyone who saw the incident or knows the location of the driver to contact them.

A 35-year-old man attended Fairfield Police Station on Friday afternoon.

In the evening, NSW Police confirmed he was being questioned but was not under arrest.