By contrast, building a new road or widening an existing road will take far less time and money. It is usually a matter of a few days or weeks before the city people can enjoy a new or a widened road. The problem, however, is that compared with the train or subway line, the roads can solve the traffic congestion but only to a very limited extent. Besides, too many roads will take up a lot of urban spaces, which are often already very crowded.

In my view, both ways are effective to address the traffic problem in cities, but it is the city conditions that will determine which way is better. To a cosmopolitan like New York and Beijing, where the huge population live far and wide apart, more train and subway lines may be preferable, but to such a small city as Providence with a small area and small population where most people drive to and from work, more and wider roads are perhaps more necessary.   

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