Regarding one-way streets, they have made a couple of them one way or blocked an entrance in another case to prevent vehicles from taking shortcuts. The street (Old Simpson Bay Rd I believe) along the beach from the police station to near Horny Toad that parallels Welfare Rd was made one-way several years ago but just a portion of the road was changed. People still drive both ways on it, park cars both ways but it did seem to prevent a lot of the cutting through for a shortcut.

I do think the busses are privately owned and licensed as such but no idea if they have specific routs. Bigger busses would not be wise IMHO.