Taxicab, short forms taxi or cab, is a type of public transport for a single passenger, or small group of passengers, typically for a non-shared ride. A taxicab is a vehicle for hire which conveys passengers between locations of their choice. (In most other modes of public transport, the pick-up and drop-off locations are determined by the service provider, not by the passenger.)

Although types of vehicles and methods of regulation, hiring, dispatching, and negotiating payment differ significantly from country to country, some common characteristics exist.

Public transport, public transportation, public transit or mass transit comprises all transport systems in which the passengers do not travel in their own vehicles. While it is generally taken to include rail and bus services, wider definitions would include scheduled airline services, ferries, taxicab services etc. — any system that transports members of the general public. A further restriction that is sometimes applied is that it should take place in shared vehicles, which would exclude taxis that are not shared-ride taxis.

The term public transport is preferred in the British Isles and most Commonwealth countries, whereas public transportation, public transit or mass transit are usually used in North America. The term transit is less likely to include long-distance forms of public transportation, such as long-distance or commuter railroads, inter-city buses, or intercity railways.

Public transport is usually regulated as a common carrier and is usually configured to provide scheduled service on fixed routes on a non-reservation basis. The majority of transit passengers are traveling within a local area or region between their homes and places of employment, shopping, or schools.

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