Police in West View say Soumana Dao picked her up even though he wasn't on-duty and wasn't her assigned Uber driver.
Dao started driving north on Interstate 279 toward his home on Center Avenue in West View, according to police, not toward hers in the South Hills.
Police say he also started touching her inappropriately.
A neighbor heard the woman in distress and stepped in to help her, according to police.
A representative for Uber told WPXI that Dao is a driver but wasn't on a trip that night and has since been removed from the app.
The ride-sharing company also advises paying attention to who is picking you up and what car they'll be in.