Articulated buses take the form of single-decker bus with a 'trailer' portion attached. In articulated buses, drive can be through the front or rear section's axles. In modern articulated buses one can walk between the front and rear sections through an "accordion joint".
In the UK they are often called bendy buses.
[edit] Low-floor buses
For many new fleets, particularly in local transit systems, there is an increasing shift to low-floor buses (primarily for easier accessibility).
High-floor buses, whose design allows for luggage compartments underneath the passenger seating area, are used for longer-distance intercity travel (see Coaches). The move to the low-floor design has all but eliminated the mid-engined design, although some coaches still have mid mounted engines.
[edit] Bi-articulated
An uncommon departure from the standard rigid or articulated buses, there also exist limited instances of bi-articulated buses, and passenger-carrying trailers— either towed behind a conventional bus (a bus trailer), or hauled as a trailer by a truck (a trailer bus).
[edit] Open top
A bus may be "open top", that is to say, it has little or no roof. The aim is for passengers to get a better feel for of the outdoors (for good or bad), and a better view. Typically they are used as tourist buses on short city tours. The coachbuilding is generally done when the vehicle is first made, but sometimes an open top bus is converted from a double-decker that has scraped or lost its roof on a low bridge or other impediment, since its chassis will generally be intact
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