Double-decker buses have 2 levels of seating (or mixture of seating and standing).
it's called a double Decker bus
Up the Downstair was created on 1993-06-07.
(RM = routemaster and RML = long version) RM buses seat 64 (28 Downstairs, 36 Upstairs) RM coaches seat 57 (25 Downstairs, 32 Upstairs) RML buses seat 72 (32 Downstairs, 40 Upstairs) RML coaches seat 65 (29 Downstairs, 36 Upstairs)
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Greyhounds. (???)
RM's (routmasters) are 27 feet 6 inches long, and RML's (long routemasters) are 30 feet long. both are 8 foot wide, and both are 14 foot and 4.5 inches tall. this applies to both bus and coach versions. RM buses seat 64 (28 Downstairs, 36 Upstairs) RM coaches seat 57 (25 Downstairs, 32 Upstairs) RML buses seat 72 (32 Downstairs, 40 Upstairs) RML coaches seat 65 (29 Downstairs, 36 Upstairs)
Cabover.
busfobia
Buses
Upstair, downstair, death stare, grey hair, unique flair
to go downstairs is more often translated 'descendre' in French.
The sound made by buses is typically referred to as engine noise or bus engine rumble.