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Alongside the other reasons mentioned (comfort, right of ways, dedicated corridors), it's blatantly obvious where trams run due to the tracks in the ground.

With a bus, there's always the potential the route has changed, or your specific bus is skipping over your stop for some reason. With a tram, even if you've never been to that city or part of the city before, you know there's going to be a tram along those tracks, and you simply need to walk along the road till you find the stop.