Preposizioni di mezzo

Genericamente la preposizione per un mezzo è by, tenendo presente che esistono numerosissime eccezioni.

by car / taxi
ma: in my/a sports car, in George's car, in a taxi

by bus / coach / underground
ma: on the bus, on an air-conditioned coach

by train / rail 
ma: on the train

by plane / air / jet
ma: on a plane / jet

by boat / ship / ferry 
ma: on a big ship, in a boat

by bicycle / moped / motorcycle
ma: on his bicycle, on a new moped / ...

Andare a / in...

to walk                                 ---------------->    to go on foot

to drive                                 ---------------->    to go / travel by car

to ride a bicycle / to cycle     ---------------->    to go by bicycle

to fly                                      ---------------->    to go / travel by air

to ride a moped / motorcycle ----------------> to go / travel by moped / motorcycle