The MTA has released DriveCam  video of a crash involving a 19-Polk bus and a pickup truck on De Haro and 18th Streets in Potrero Hill early yesterday morning that left seven people injured. The press release from spokesperson Judson True said "the video appears to show that the Muni bus rolled through its STOP sign on De Haro Street and the truck ran its STOP sign."
We've had difficulty downloading the Mac-unfriendly file that shows the crash from several different camera angles but our friends at the SF Appeal  have it.
The video shows that the operator was going about 8 miles an hour -- the average speed for a Muni bus -- when the crash happened, which True describes as rolling. The operator has been placed on non-driving status pending the outcome of a police investigation. More coverage at SF Gate .