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The rising level of congestion and air pollution found in most of the world's cities can be attributed directly to the rapidly increasing number of private cars in use.in order to reverse this decline in the quality of life in cities, attempts must be made to encourage people to use their cars less and public transport more. Standing at the turn of the new century, we observe that technology changes the world. Many new inventions such as the cellphone, the car and the Internet help us to have a comfortable life. Many car factories manufacture economical and modern cars, and every person can have a private car. These cars cause new problems such as traffic, air pollution and noise which constitute and these problems are the major challenges problems in every big city. A question which is the matter of concern is whether it is better to use our personal car or utilize public transportation systems. I am, to a great extent of the opinion that public transportation system helps us to have a better city. To begin with, although no one can ignore the satisfaction and conveniences offered by our personal cars, public transportation helps us to decrease traffic. Broadly speaking, if all of us try to prefer public transportation to (over?) our personal cars, we do will not have a long line of cars in streets. This will causes a significant decline in fuel usage and allow to the earth to breathe. Of equal importance is the fact that mass transit is quite/very economical. Simply stated, we must not pay high expenses for fuel, repairs and tax. One of the most important factors which encourages people to use public transportation is their safety. Metros and buses prepare a safer environment for their passengers, and private cars have more accident rates over mass transit. However, what I stated cannot be overgeneralized to all contexts, so sometimes some times your private car can be an electric one car and environmentally friendly, in these cases those are suitable choices rather than other combustion vehicles. From my perspective, public transportation system is the best choice for our cities. To recapitulate the reasons, not only are those economically , but also those are safe and reduce our traffic, too.