104国道沧州地区段汽车专用二级公路自1987年10月建成通车以来,道路条件明显改善,通行能力成倍增加,运输成本降低,运行时间节约,司机安全感增强,旅行的舒适感提高,经济效益十分显著。根据1987年该段公路交通调查资料证明:汽车平均运行速度已提高为60～64km/h;两年施工期间,交通流量不但没有减少,反而分别提高8.37％和15.52％(其中汽车增长为6.3％和24.8％);汽车比重由1985年的74.47％上升为77.88％。公路工程的直接效益一般用该路建成后第—年的投资回收率和投资回收期作为评价指 104 State Road Cangzhou area section of motor vehicles for secondary roads since October 1987 opened to traffic, the road conditions have improved significantly, multiplying the ability to pass, transport costs, operating time savings, drivers feel more secure, increased travel comfort, economy Benefit is very significant. According to the survey data of highway traffic in 1987, the average running speed of automobiles has been raised to 60-64km / h. During the two years of construction, the traffic flow has not decreased but increased by 8.37% and 15.52% respectively (of which the growth of vehicles was 6.3% And 24.8% respectively); the share of automobiles increased from 74.47% in 1985 to 77.88%. The direct benefits of highway engineering generally use the road after the completion of the first year of the investment recovery rate and payback period as the evaluation index