Public transport (North American English: public transportation or public transit) is a sharedpassenger transport service which is available for use by the general public, as distinct from modes such as taxicab, car pooling or hired buses which are not shared by strangers without private arrangement. However, taxicab is a form of public transport in Singapore.
Public transport modes include buses, trolleybuses, trams and trains, rapid transit(metro/subways/undergrounds etc) and ferries. Public transport between cities is dominated by airlines,coaches, and intercity rail. High-speed rail networks are being developed in many parts of the world.
Most public transport runs to a scheduled timetable with the most frequent services running to aheadway. Share taxi offers on-demand services in many parts of the world and some services will wait until the vehicle is full before it starts. Paratransit is sometimes used in areas of low-demand and for people who need a door-to-door service.
Urban public transport may be provided by one or more private transport operators or by a transit authority. Public transport services are usually funded by government subsidies and fares charged to each passenger. Services are normally regulated and possibly subsidized from local or national tax revenue. Fully subsidized, zero-fare (free) services operate in some towns and cities.
For historical and economic reasons, there are differences internationally regarding use and extent of public transport. While countries in Old World tend to have extensive and frequent systems serving their old and dense cities, many cities of the New World have more sprawl and much less