Abstract: Most of the curves are sections that traffic accidents frequently occur. In order to prevent the collision risk caused by lane change during the turning and improve the safety of the vehicle, a model of lateral safety distance of automobile in the bend was established. In the proposed model, the driving distance of the lane-change vehicle was decomposed into lateral and longitudinal directions, so as to ensure that the two cars should not collide with each other when driving in the same direction in the bend. The lateral safety distance between the two vehicles was deduced, and the parameters such as longitudinal critical safety distance and the angle between the two cars were determined. Moreover, the proposed model was compared with the existing lateral critical safety distance model. The results show that the proposed model of lateral safety distance of automobile in the bend can accurately and effectively determine the lateral safety distance and improve the reliability of early warning.

Key words: traffic and transportation engineering, automobile, bend, lateral safety distance, anti-collision, modeling

摘要： 弯道多为交通事故高发路段，为了防止汽车转弯时因变道产生的碰撞危险，提高行车安全性，建立了汽车弯道行车侧向安全距离模型，该模型将变道车辆的行驶距离分解为侧向纵向两个方向，保证在弯道同向行驶时不会因车辆变道相撞，推算出两车应保持的安全侧向车距，确定了纵向临界安全距离、两车夹角等参数，并将该模型与现有的侧向临界安全距离模型进行仿真对比。结果表明：汽车弯道行车侧向安全距离模型可以准确、有效的判定侧向安全距离，提高了预警的可靠性。

关键词: 交通运输工程 , 汽车, 弯道, 侧向安全距离, 防碰撞, 建模