关键词: 公路运输, 高速公路改扩建, 驾驶工作负荷, 中央分隔带, 安全舒适性

Abstract: With the rapid development of economic and road transportation industry, freeway expansion may become the new hot spot for future road construction. In the expressway unilateral widening project retaining median barrier of the primary road, only in the interchange and service area near the entrance to the central median cut openings for vehicle access, which can greatly reduce the difficulty of construction, save the cost of the project, and improve vehicle operation the safety and comfort. To ensure program reliability of vehicle running into the openings, interweavement theory, traveling through space theory and queue theory are used to analyze program of median barrier opening length. Traffic control scheme is proposed based on the road traffic psychology, traffic engineering, road traffic safety engineering and driver safety, and comfort, etc. The theory of driving workload and simulation experiments verify that the technical solutions is safe and comfortable.

Key words: highway transportation, expressway changement and extendibility program, drive workload, median barrier, safety and comfort 