Comparison of Operations of Single-Point and Tight Urban Diamond Interchanges

摘要: Single-point urban interchanges (SPUIs) and tight diamond (TUDIs) are alternatives typically considered in locations where roadway right-of-way is constrained. The body of research comparing these two interchange types limited, operational comparisons varied their findings. It believed that the traffic operation performance does not differ significantly, which makes it challenging for transportation practitioners to select a preferred type specific location. operations geometrically similar SPUIs TUDIs were compared using microscopic simulation analysis wide range volume conditions. was conducted with CORSIM optimum signal phasing timing both types. Three test cases five varying levels developed evaluate over capacity 30 analyzed simulation, results summarized compare findings show geometric conditions tested, SPUI provides greater than TUDI. Over tests, provided higher average travel speeds, fewer phase failures, lower percentage stops, considerably capability serve traffic. TUDI will reach when operating at