I think the limit should be just 10, and no driver. maybe an NPC that warps them somewhere and the bus is just a picture with everyone elses head. So it's not even like there was any of us IN the bus.
Because seriously, it'd be kinda lagg7y. Bringing pictures only and not connecting players would reduce the lag by a lot. And the players get warped to destination and have to wait in increments of 10 seconds by... 1 street=10 more seconds?