Like what? Are there special roads that busses can drive down but a sedan gets stuck on? Some kind of road made especially for the tires of the bus and no other vehicles? Like a tram system, or gondolas maybe?
Cars and busses are both road vehicles, and roads serve them both. We can put up signs and write rules about which vehicle can go where, but those are basically free to change.
Capital gains tax or Land Value Tax would be more interesting.