关键词: 互通式立交, 变速车道, 线形质量, 评价

Abstract: Interchanges are essential components of freeways, and their alignments have great impact on traffic functions. By analysing the running state of vichcles, this pape discusses the design theory of speed change lane, and establishes speed model of running vehicle and presents method to evaluate the quality of interchanges by using speed ratio, vehicle fuel comsumption, and alignment co-ordinating coefficient of ramps as evaluation index. The result of this research is of great significance in interchange plan designing, choosing or in existing interchanges post-evaluating and remarking.