A bus (archaically also omnibus, multibus, motorbus, autobus) is a road vehicle designed to carry many passengers. Buses can have a capacity as high as 300 passengers. The most common type of bus is the single-deck rigid bus, with larger loads carried by double-decker and articulated buses, and smaller loads carried by midibuses and minibuses; coaches are used for longer-distance services. Many types of buses, such as city transit buses and inter- city coaches, charge a fare. Other types, such as elementary or secondary school buses or shuttle buses within a post-secondary educationcampus do not charge a fare. In many jurisdictions, bus drivers require a special licence above and beyond a regular driver's licence.
Buses may be used for scheduled bus transport, scheduled coach transport, school transport, private hire, or tourism ; promotional buses may be used for political campaigns and others are privately operated for a wide range of purposes, including rock and pop band tour vehicles.
Horse-drawn buses were used from the 1820s, followed by steam buses in the 1830s, and electric trolleybuses in 1882. The first internal combustion engine buses, or motor buses, were used in 1895. Recently, interest has been growing in hybrid electric buses, fuel cell buses, and electric buses, as well as ones powered by compressed natural gas or biodiesel.
