Trolleybus
Articulated buses, also known as tandem buses, bendy buses, or accordion buses in the UK and US, are a type of bus with an enhanced passenger capacity. Found almost exclusively in public transportation use, these buses are approximately 18 m (60 ft), while regular buses are 11 to 14 m (35-45 ft). To make them nimble enough to safely navigate streets at their increased length, they are fitted with an extra axle (set of wheels) and a joint usually located slightly behind the midpoint of the bus, behind the second axle. Some models of articulated buses have a steering arrangement on the rearmost axle which turns slightly in opposition to the front steering axle, which allows the vehicle to negotiate turns in a somewhat crab-like fashion, an arrangement similar to that used on long hook-and-ladder fire trucks operating in city environments.
Some buses have two joints, and these are called bi-articulated. Their capacity is around 270 and their length about 24 m (79 ft). These are exotic and usually run in separate and often auto-guided lanes (quasi-trams or bus rapid transit).
