INFLUENCE OF OPPOSED RIGHT-TURNS ON SATURATION FLAW AT SIGNALISED INTERSECTIONS

• Main Author: Agustin, Jany
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2701
• Institution: Institut Teknologi Bandung

The objective of the project was to study the influence of opposed right-turns on saturation flow. It was intended to use this as a tool for design and timing of signalised intersections because no guidance procedure was available in Indonesia. Data was collected from two signalised intersections in Bandung by video camera. All parameters used were obtained through analysis of the video recordings, except geometric lay-out and signal timing. Three theoretical models were discussed and applied to the collected data and then compared with the observations. The theoretical methods increasingly overestimated the saturation flow at higher approach width. The Australian method gave lower values of saturation flow than the observed at all levels of opposing flow in approaches having one lane. Generally good correlations were obtained between observed saturation flow, approach width and opposing flow. However, this was not the case regarding the ratio of right-turns. Field observations showed that the right-turning vehicles did not give way to opposing flow, which is an important difference between Indonesian and Western traffic behaviour. Therefore, it is necessary to develop a model for capacity calculations applicable to Indonesian conditions based on further data collection for a wide range of conditions and sites.