随着我国高速公路的不断建设，机动车保有量的持续增加，交通事故呈上升趋势，开展高速公路的安全管理研究也日益重要。

With the constant construction of expressways in China and increasing number of vehicles, traffic accidents are rising, so it is increasingly important to study the safety control in expressways.

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随着城市机动车保有量的增加，机动车排放物在大气污染中所占的比例越来越大。

With the increasing number of city vehicles, the vehicular pollutant dispersion plays a more and more important role in air quality in city.

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随着城市机动车保有量的不断增加，城市内的机动车尾气污染的严重性日益显现，本文从政策、技术、交通管理等多方面提出了加强城市机动车尾气污染的治理对策。

With the increase of the vehicles in use in the city, the exhaust pollution in the city becomes more and more serious. Suggestions are presented in terms of policy , technology and traffic management.

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