No idea, it's a similar issue with the busses in LA, all of those that cooperate with the LA metro system are on nextbus, but the few that don't (santa monica)

No idea, it's a similar issue with the busses in LA, all of those that cooperate with the LA metro system are on nextbus, but the few that don't (santa monica) aren't on nextbus at all. I suspect it has something to do with cost of the hardware that the busses have.