How does bus movement actually work? Is it like teleportation; or does the bus actually take a route? If it takes a route, what happens if the bus passes through a Shoggoth-filled location? If Shoggoth's do have an effect on bus movement, can the bus take any route of that player's choosing (e.g. the long way around to avoid a Shoggoth), or must it take the shortest route (e.g. potentially passing through a Shoggoth location) - albeit where multiple routes are equally shorter then presumably the player can decide?
I assume that gate movement is teleportation.
Mechanically bus movement is uninterrupted, you do not encounter Shoggoth figures during bus movement. You move from bus station to bus station instantly. Not super thematic, but mechanically simple.