13.10 Urban Transportation
Public transportation has made a comeback in some cities.
Development of Urban Transportation
Cities buit street railways (called trolleys, streetcars, or trams) and underground railways (called subways) to accomodate commuters.
Public transportation has been expanded in some U.S. cities to reduce air polution and conserve energy.
Ideas of future transportation
Dekdo - The future of urban transportation
Green Ride - INU Personal Urban Transportation Vehicle - CES 2015