That makes sense, given that the median car mile probably isn’t in a dense urban core. The more accurate comparison would require us to know pedestrian fatalities per mile in urban areas.

Buses are also more massive so more likely to cause serious injury in an accident. They can't stop as fast as a car/bike /etc. But that's also why they seem to move more slowly, takes them longer to accelerate, which one would think might give others an advantage to avoiding them.

This is for SF, so 100% urban for both bus and vehicle data