A 73-year-old woman was struck shortly before 4:30 p.m. when the outbound 18 46th Avenue bus was turning from John Muir Boulevard onto Lake Merced Boulevard.
The woman was transported to San Francisco General Hospital.
Muni spokesperson Paul Rose says the cause of the accident remains under investigation. And as part of a standard procedure in these types of investigations, the driver is being questioned and will be undergo drug and alcohol testing.
