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Public transportation systems
According to the American Public Transportation Association, public transportation systems in the United States carried passengers on more than 10 billion trips in 2009.
Public transportation systems often are made up of several different types of transportation, and different elements may be oper- ated by a range of state, regional, and local transportation authorities.
Buses are the backbone of the public transportation system in the United States, and they account for about half of all public transportation rides.
Rail-based public transportation systems use a few different approaches and enable people to take trips that range from just a few blocks to dozens of miles:
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