Uber Collision-Sophia Liu

A memorial at the intersection of Polk and Ellis streets in San Francisco, where a 6-year-old girl was struck by a car and killed on New Year’s Eve. (Sara Bloomberg/KQED)

A memorial at the intersection of Polk and Ellis streets in San Francisco, where a 6-year-old girl was struck by a car and killed on New Year’s Eve. (Sara Bloomberg/KQED)

A memorial at the intersection of Polk and Ellis streets in San Francisco, where a 6-year-old girl was struck by a car and killed on New Year’s Eve. (Sara Bloomberg/KQED)