In Bugtown everyone’s houses are made out of leaves and the buses are just a long stick with acorn-top wheels that everyone climbs up on and one guy holds onto the back and pushes it around. They can’t steer very well so they all go in straight lines and if you need to make a turn you have to hop off and jump on another stick going in a different direction.
(Technically the stick buses are trains but the train tracks are just blades of grass that they lay down and they keep blowing away, so everyone forgets and calls them buses.)