The paper analyses and study on one mode of the externaltransportation in the central urban district of Zhongshan City, i. e. road transportation. It also puts forward the measures for improvement.
本文对中山市中心城区对外交通的方式之一，即：道路交通进行分析研究，并提出改善措施。
2
The nonstandard traffic competition and the externalities of transportation are the internal and external causes of "the tragedy of the Commons" for traffic.
交通竞争的失范和交通的外部性是造成交通“共有地悲剧”的内部和外部原因。
3
According to the URT external cost evaluation system, the author gets the result that the external costs of rail transportation is much smaller than those of other transportation methods.