It happened at 3:30 a.m. Monday on Route 13 at 6th Avenue in Bristol Borough.
Police say the victim, a woman in her 40s, was walking from a 24-hour gas station when a car hit her and kept going.
The woman was taken to an area hospital with head injuries.
Investigators were hoping to release a description of the striking vehicle later Monday or Tuesday.
Northbound Route 13 was shut down between 5th and 6th Avenues as police investigated.