Downtown San Francisco intersections are areas of chaotic lawlessness where selfishness and force are the determinant in regulating moves between drivers, cyclists and pedestrians. Each of the 3 groups is well stocked with opportunistic asshats stealing the right of way from everyone else on the street.
It is Calcutta California. So when you analyze accidents there, laws and rules have no meaning, you just have to let the facts speak for themselves.
At this point, I have no clue if the cyclists blew the red light, which is frequent and typical, or if the old man stole the intersection from the cyclists, equally frequent and typical.
This accident was at Castro and Market, which is notorious for violations of traffic among all three groups, cars, cycles and pedestrians, along with violations by taxis and transit buses. You can throw in the motor cycles and scooters that squeeze in between rows of cars to push their way to the front of stop lights.
I wish there was a sidebar on the accident itself.
Yet another reason to avoid San Francisco.