Public transport - Wikipedia

Public transport is the collective name for transport systems in which the passengers do not travel in their own vehicles. It is called public transit in the U.S.A. and Canada. While it is generally taken to mean rail and bus services, wider definitions would include scheduled airline services, ferries, taxi services etc., basically any system which is transporting members of the general public.

The term rapid transit refers to fast public transport in and around cities, such as metro systems.

Funding for public transport systems differ widely, from systems which are run as unsubsidised commercial enterprises to systems that are free of charge:

Hasselt, Belgium - free bus services
Renesse (mun. Schouwen-Duiveland), Netherlands - free bus services in the area (in summer only)
Washington, D.C. - Congressional Subway - small free metro system
some ferries, such as the Staten Island Ferry.
short-distance 'public transport' such as elevator, escalator, moving sidewalk (horizontal and inclined); these are often part of a larger public transport system or business (e.g. shop) of which the products and services are not free.
free bicycle services have been run in some places.

Other transportation services may be commercial, but receive benefits from the government compared to a normal company, e.g.,

direct payments to run unprofitable services.
government bailouts it the company is likely to collapse (often applied to airlines).
tax advantages, e.g., aviation fuel is typically not taxed.
reduction of competition through licencing schemes (often applied to taxi and airline services.)
allowing use of state-owned infrastructure without payment or for less than cost-price (may apply for railways).

One reason many cities spend large sums on their public transport systems is that heavy automobile traffic congests city streets and cause air pollution. It is believed that well maintained, high volume public transport systems alleviate this. Many complex factors affect the outcome of spendings in public transport, so success in reducing car traffic is not always assured.

Another reason for subsidies for public transit are the provision of mobility to the disadvantaged who cannot afford or are physically incapable of using an automobile.

Public transport can be faster than other modes of travel; prime examples are in cities where road congestion can be avoided, and for long distance travel where much higher speeds are possible than are permitted on roads.

Forms of public transport (in the broad sense):

Aerial tramway
Bus
Cable car on rails
Chair lift[?]
Cog railway
Conveyor transport (escalator and horizontal and inclined moving sidewalk)
Electric trolleybus
Elevator
Ferry, including hydrofoil and air-cushion ship[?] (Hovercraft)
Funicular
Light rail
Metro (Underground) systems, including rubber-tired underground
Monorail
Plane and helicopter
Taxi, including motor taxi[?], rickshaw, water taxi[?]
Train, including commuter train and high speed rail
Tram (or tramway, trolley, streetcar)

Some of these types are often not for use by the general public, e.g. elevators in offices and apartment buildings, buses for personnel or school children, freight trains, etc.

Emerging transportation technologies

Rail transport systems tend to be favoured by many cities.

Public transport is sometimes used by homeless people and budget tourists as a sleeping place. This can vary from the tourist who travels on purpose at night in order to sleep while travelling and dispense with the cost of a hotel, to people for whom the 'sleeping accommodation' is the purpose, and the displacement of the vehicle a somewhat inconvenient side-effect.

For the latter a requirement is that riding a whole night costs less than a hotel. This may especially be the case with a rail or bus pass.

One popular example is the Santa Clara Valley Transportation Authority (VTA) bus route 22, dubbed 'Hotel 22', between Palo Alto, California and San Jose, California, (Silicon Valley). A pass for 24 hours costs 4 dollars and one for a month 45 dollars, much less than a hotel, house or apartment.