求翻译：由于高速公路具有全封闭、全立交等特点，所以其交通事故形态中不存在正面碰撞事故，而追尾事故是其主要组成形式，且由于高速公路路表状态平直、设计标准高、车速快，一旦发生交通事故后果严重[1]。是什么意思？

Since the highway has the characteristics of the fully enclosed, full interchange, so the traffic accident form does not exist positive collisions and rear-end accident is the major component form, and because the highway road surface state, straight, high design standards, fast speed, in the event

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Because the highway has entire characteristics and so on seal, entire grade separation, therefore in its traffic accident shape does not have frontage collision accident, but follows the accident is its main composition form, also because the highway road sign condition straight, the design standard

Because of the closed Expressway, the entire interchange and other features, so their frontal impact accidents exists in the form of traffic accidents, is the main form of rear accidents, and due to the design of highway road surface flatness, high standard, fast speed, in case of serious traffic ac

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