You usually use the preposition on in front of a/the bus whether you are talking about someone or something. The use of the preposition in is far less commom (Longman Dictionary). So we should avoid using the in.
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Take the bus suggests getting to a destination,Ride the bus suggests the state if being on the bus, more than emphasizing the destination. ride bus would generally not be used. As a command, one might say ride the bus.
As long as you use on for a bus, train, plane to travel, it means in/into. It doesn't necessarily mean its roof. (Keep it in mind that you get on a bus, plane or train; similarly, when you are travelling, you are on it).
Busses is predominantly used in ???? American (US) English ( en-US ) while buses is predominantly used in ???? British English (used in UK/AU/NZ) ( en-GB ). In the United States, there is a 85 to 15 preference for buses over busses. In the United Kingdom, there is a 92 to 8 preference for buses over busses.
GRAMMAR: Patterns with taxi• You say get in a taxi: He got in a taxi and left. ?Don't say: get on a taxi• You say get out of a taxi: Two women got out of the taxi. ?Don't say: get off a taxi• You say that someone is in a taxi: I read my notes while I was in the taxi.