EFFECT OF DOWNSTREAM OBSTRUCTION ON SATURATION FLOW

• Main Author: RAUF, ABDUL
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/1552
• Institution: Institut Teknologi Bandung

EFFECT OF DOWNSTREAM OBSTRUCTION ON SATURATION FLOW, <br /> ABDUL RAUF, 1999, Program Magister Sistem dan Teknik <br /> Jalan Raya, Program Pascasarjana, Institut Teknologi <br /> Bandung. <br /> This thesis describes a study at a major signal <br /> intersection in Bandung about the effect of downstream <br /> obstruction on saturation flow. The objectives of the <br /> study were to identify fluctuations in saturation flow <br /> and to define the effects caused by a stopping angkot <br /> at several downstream locations without considering the <br /> duration of stop. <br /> calculation of saturation flow value were <br /> performed using Program PASS. The study analyzed two <br /> consideration ie; (1) unobstructed saturated discharge <br /> conditions and ( 2) obstructed saturated discharge <br /> conditions. <br /> The Study concludes that, saturation flows were <br /> found to be reduced due to a stopping angkot downstream <br /> of the stopline, although this reduction was only <br /> observed with long stopline queues where the effect of <br /> stop reached back to the stopline discharge flow. The <br /> prevailing saturation flow for observed 9.8 meter wide <br /> approach is 6296 pcuphg, which is 6.7 % higher than <br /> the IHCM estimate, 12 % higher for protected right <br /> turning. Data from observed 4-lane approach indicate <br /> that the effect of stopping angkot in lane-1 also <br /> affected lane-2 to smaller degree. The data show that , <br /> the nearer the location of downstream stop, the larger <br /> the reduction in saturation flow, with an almost linear <br /> relationship, the best relationship was with a <br /> logarithmic regression line, but the resulting <br /> reduction factors are practically similar. The observed <br /> show that an angkot stop at 73 meter downstream of <br /> stopline does not reduce the saturation flow, this <br /> value is probably related to the length of queue which <br /> was discharge during the green phase. <br /> For further study it is recommended to <br /> investigate many locations and smaller approach widths <br /> around the country to be able to define a nationally <br /> representative procedure factor for IHCM.