Abstract
Recently, with the development of urban road net and the shortage of land resources, underground expressway has a rapid development, but the associated research of traffic safety is lagging. The traffic flow data and method of mathematical statistics is used to analyze the difference of vehicles running index such as speed, space headway and lateral movement in underground expressway comparing to such things in expressway above the ground. It also indicates the possible impact on the safe operation of the underground expressway caused by these differences, and gives some suggestions on the improvement of the underground highway safety from the point of safety of vehicle operation.
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