public transportation or private cars?
...citizens. Since owning a private vehicle means high cost of insurance, gasoline and maintenance, which can easily be as much as several thousand dollars per annum, only a limited proportion of the city-dwellers can afford it. Compared with the high expense of owning private cars, public transportation is relatively cheap. Thus, a developed public transportation system is an ideally economical way for the mass. In addition, greater use of public transportation causes less air pollution and will keep the environment cleaner. Improvement of the quality of the public transportation systems, including buses, trains and subways, will encourage people to use them instead of driving their own cars. The high energy-efficiency of public transportation systems undoubtedly reduce the exhaust gas emission and help to fight the global-warming effect. At last but not least, public transportation means a far more efficient use of fuel. For example, the fuel exhausted by a bus, whi...