Buses are road vehicles designed specifically for the function of carrying many passengers simultaneously. Commonly planned and scheduled as an essential component of a city, local, or regional transportation network, buses come in a variety of types and sizes to service specific demands. Bus designs have a broad range of capacities and purposes from standard single-deck city or transit buses, to minibuses, midibuses, double-decker, articulated, school, and coach buses. Buses are utilitarian forms of public transportation that continue to serve a large population of people around the world.