San Francisco is full of narrow, busy, streets. Throw in buses,pedestrians, short light changes and the mix can turn deadly.
The San Francisco Chronicle recently published a map of San Francisco intersections that have a high Muni accident rate. The top three intersections with the highest rate of Muni accidents are:
1) 6th and Market Street/Taylor and Golden Gate
2) 3rd and Market Street/Kearny and Geary Street
3) 5th and Market Street
Take a look at this map mash up to see more intersections that Muni needs to start paying attention to.