Public vehicles are a common form of transportation in many cities. A TRAM, also known as a STREETCAR or trolley, is a rail vehicle that runs on tracks along public streets and is powered by electricity. Buses are motorized vehicles that run on roads and are used to transport passengers. Cabs are private vehicles that are hired to take passengers from one place to another. An autobus is a large motor vehicle used for public transportation, usually with multiple stops. A STREETCAR is a rail vehicle that runs on tracks along public streets and is powered by electricity, similar to a TRAM.