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When we drive vehicle on expressway in the mountainous areas, there are many factors affecting driving safety. Especially when we drive at a high speed, pneumatic lateral force under the effect of horizontal wind will cause wheels cornering and unsteady steering, which affects the safety of driving. Based on the driving characteristics on the section of expressway with crosswind in mountainous areas, and three security issues that are vehicle roll, cornering and sideslip under the action of crosswind, this paper gives the various speed limit and proposes effective measures to ensure traffic safety, all of which can offer decision-making basis for traffic safety administration of the mountain expressway.

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