Exaggerated as it is, the phenomenon is not uncommon nowadays. With the number of private cars increasing②, traffic jams in metropolitans are bound to happen. Heavy transportation pressure in large cities may bring much inconvenience to people and exert negative impacts on the environment. On the one hand, when traffic jam happens, short distance in the past now seems to become terribly long, and drivers could do nothing but to wait. Therefore, a lot of precious time has been wasted on the road. On the other hand, exhausted gas emitted by cars③ has increased the burden of environment and caused carbon emission, which has diverted from the concept of living a low carbon life。

　　Therefore, effective measures should be taken to alleviate the traffic jam. Firstly, taxes levied on the sales of private cars④ should be raised so as to restrict private car ownership rate. Secondly, public transportation such as buses and subways, which are low-carbon transportation means, should be encouraged and promoted so that we can have a smooth transportation。

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（实习编辑：高奕飞）