Traffic Performance of U-Turn Effects at Median Opening on Four-Lane Divided of Urban Street (Study Case: Yogyakarta, Indonesia)

The main purpose of this study was to determine trafficperformance at a median opening on the urban street. In order to achievethe research purpose, data were obtained at four U-turn locations insequence at Gejayan area of Yogyakarta. By using VISSIM software, itanalyzed traffic delay, queue length, and average travel speed on theexisting condition then suggested the solution to improve the performance. This research showed that the longest queue length was around 200 m andthe delay was almost 25 s. The result suggested that U-turn location withbad performance should be omitted. Reducing the number of U-turnlocations will improve more than 50% of the traffic performance in theurban street. In addition, 100 m should be the minimum distance among Uturnsto maintain the traffic performance