截止目前，我国避险车道的发展已达14 a，但在设计中，避险车道的偏角仍然没有可靠的理论设置方法，设计者多根据经验通过主观判断确定避险车道的偏角设置，造成偏角设置不合理，降低避险车道的防护安全性。根据失控车辆从主线偏转进入避险车道过程中的行驶安全特点分析，提出了合理的避险车道偏角设置方法，为避险车道偏角的设计提供理论依据。%Up to now,The development of Truck Escape Ramp has reached 14 years,but the method of installation is still not setting for drift angle on Truck Escape Ramp,the drift angle to be deter-mined by designers according to the experience and subjective judgment,it caused unreasonable angle setting and reduced security of Truck Escape Ramp.The paper puts forward the method of drift angle in-stallation which according to the analysis of driving safety features when uncontrolled vehicle was turning to Truck Escape Ramp from mainline,It provides theory evidence for design drift angle on Truck Escape Ramp.
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