An accident at 4th and Market during the evening drive means that buses will back up Market Street both ways. This was in the the Financial last night:
This was the scene. I didn’t see what happened.
An SFPD motor patrol officer said the bike rider had a broken back and a possible broken pelvis. He said that words might have been exchanged between the bike rider and somebody in the red Hyundai before the collision.
Last I heard, the bike rider was responsive and stable.