They used city buses to move people inside of the city, not out of the city.
Howlin flat out said that you were wrong, and that they were used to shuttle the citizenry OUT of the city before Katrina hit.
So where are they now? Especially given the very tenuous situations at The Doom Dome and The Convention Coop? Many people are fairly VERY poorly at this point.
Yes, that is what I remember. They took people to the SD and other 'refuges of last resort'. As far as I know, public transportation WAS NOT USED for evacuation.