Double-decker bus

A bus with two passenger decks, one above the other, carrying more passengers within a given road footprint than a single-deck bus.

Bus: A road vehicle designed to carry multiple passengers along a route. The double-decker is a bus variant whose defining feature is a second passenger deck.
Low-floor bus: A bus designed with a low passenger floor to ease boarding, often without steps at the entrance. Low-floor layouts ease access but can constrain the space available for stairs and lower-deck seating.
London bus: A bus used in London's public transport network, including the city's well-known double-decker models. London's double-deckers are a prominent example of the type in everyday urban transit.
Single-decker bus: A bus with one passenger deck. It offers a lower vehicle profile but generally less passenger capacity within the same length.
Vehicle floor: The structural surface in a vehicle that supports passengers, seats, and equipment. A double-decker has passenger floors at two different heights.
Open-top bus: A bus with an uncovered upper deck, commonly used for sightseeing tours. Removing the upper deck roof creates a distinctive double-decker configuration for sightseeing.
Sightseeing bus: A bus used to transport visitors between landmarks, often with commentary and open-air seating. An elevated upper deck gives passengers a clearer view of city landmarks.
Articulated bus: A bus with two passenger sections joined by a flexible joint. It increases capacity through greater length rather than a second deck.
Staircase: A series of steps connecting different levels in a building or vehicle. Stairs provide access between passenger decks in many double-deckers.
Bus rapid transit: A bus-based public transport system using features such as dedicated lanes and rapid boarding. High-capacity buses can support busy corridors, though double-deckers are only one possible vehicle choice.

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