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city bus 
Motorized vehicle for city transportation of passengers who are standing or seated.
route sign
Screen usually on the front, rear and right side of the vehicle, displaying the number of the bus’s route.
air intake
Opening in the roof, fitted with a cover, for letting fresh air into the bus.
two-leaf door
Wide door divided into two movable parts, which double back to each side to allow several people to pass through at once.
