City bus drivers around these parts are, IME and in my observation, good and courteous drivers.

School bus drivers, on the other hand, can do some pretty rude and dangerous things to a cyclist. My impression is that they are in a rush to get to the next school-- they have to take all the high schoolers first, then rush back to run the elementary kids home.

I blame the bus companies for trying to squeeze profits out of the schedules and routes.