\ A bus (contracted from omnibus , [1] with variants multibus , motorbus , autobus , etc.) is a road vehicle that carries significantly more passengers than an average car or van . It is most commonly used in public transport , but is also in use for charter purposes, or through private ownership. Although the average bus carries between 30 and 100 passengers, some buses have a capacity of up to 300 passengers. [2] The most common type is the single-deck rigid bus , with double-decker and articulated buses carrying larger loads, and midibuses and minibuses carrying smaller loads. 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 ...