自从1918年世界上第一座环道一美国阿林顿试验场问世以来,不同类型,不同功能的室内外环道装置相继建成。几十年里,通过环道试验取得了不少有价值的研究成果,这些成果成功地应用在路面结构设计与材料设计方法上。在70年代,我国也着手道路环道试验研究,这方面工作刚刚起步。近三年,我们结 Since the first ring road in 1918, the Arlington Experimental Field in the United States, different types and different functions of indoor and outdoor ring devices have been built one after another. For decades, many valuable research results have been obtained through the roundabout test. These achievements have been successfully applied in the pavement structure design and material design methods. In the 1970s, our country also embarked on experimental studies on the road circle, and work has just started. Nearly three years, we knot