Calculation of Speed Limit for Work Zone of Expressway Based on Information Processing Capacity of Drivers

On the basis of human engineering,information received by drivers is divided into road geometry information,road traffic information,traffic operations information,climate and environmental information and driver's information.The information processing model is presented according to driver information processing capacity while driving,and the speed limit value calculation method is put forward.Considering the lane width,number of lanes open,isolation facilities,the opportunity to merge,collusion and conflicts affecting truck drivers information receiving as the quantitative impacts,it is testified by a typical entrance work zone of an expressway,the theoretical speed limit value is 50km/h with high precision,compared with the application value 55km/h,which provides a useful tool for operation administration of expressway.