There are two main types of buses: rural and city buses. Some languages have completely different words for different types of buses. Legislation differs, depending on which kind of bus is being used. Among other things, the legislated amount of rest for drivers as well as seat belt requirements differ. In city traffic seat belts are not mandatory, but nowadays all long-distance buses are equipped with seat belts, which passengers are required to use by law.
According to the Swedish vehicle regulations a bus is defined as ”a car designed principally for the transportation of people, with more than eight seats excluding to the driver's seat”. In Sweden, mini buses with up to nine seats are classified as cars and can be driven with a category B driver's license. In order to drive larger buses and buses with trailers, a category D or DE driver's license is required.
An average-sized bus has 50 passenger seats as well as luggage space. A double-decker seats about 70 passengers.