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Bus is a passenger vehicle used for transportation of a large number of people simultaneously. It is categories under public transport. Depending on the load capacity, they distinguish between single-decker, double-decker, articulated buses, as well as midibuses and minibuses to carry small numbers of people.

These types of buses use petroleum as a fuel, which trolley-buses ‘consume’ electricity. At the present time, buses are manufactured taking into consideration the needs of the disabled. In some countries (the U.S., for example), companies and schools own buses to transport employees and schoolchildren. Airports also operate a number of buses for crew and passenger transportations.

Buses play an important role in the tourism industry. Numerous tourists travel by buses even around the world in order to save money and also to see local attractions or scenery. Buses are also often used in public information campaigns, political campaigns, for advertising, as well as public relations or promotional purposes. The UK's National Exhibition Centre in Birmingham once in two years holds Euro Bus Expo trade show, featuring the latest vehicles, product and service innovations in the industry.