CROSSING BEHAVIOUR AND GAP ACCEPTANCE AT AN UNSIGNALISED INTERSECTION IN BANDUNG

• Main Author: DEWANTI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2781
• Institution: Institut Teknologi Bandung

CROSSING BEHAVIOUR AND GAP ACCEPTANCE AT AN UNSIGNALISED INTERSECTION IN BANDUNG, Dewanti, 1992, Program Sistem dan Teknik Jalan Raya, Program Pascasarjana, Institut Teknologi Bandung. The operation of unsignalised intersection is concerned to traffic behaviour in crossing or merging movement. Traffic behaviour indicate the way drivers handling their vehicles and the interaction to each other. This study involved crossing light vehicles and motor cycles and conducted at day time on an unsignalised intersection (Aceh - Martadinata) in Bandung. Traffic behaviour was devided into six classes, namely unimpeded, given priority, forcing, follow forcing, gapping and follow gapping. From the fraction of gapping class, the critical gap acceptance was investigated. Gap is the time interval between two major road vehicles that is considered by drivers when entering a priority intersection from a minor road. Lag is defined as an unexpired portion of a gap which remains when a minor road drivers arrives at the intersection. Gap and lag data were collected and pooled together in gap acceptance study. This combination created biased data due to difference percentage of gap acceptance between cautious driver and incautious one. The more cautious driver, the more gaps rejected and vice versa. Biased data created displacement of unbiased normal cumulative curve to the right. To eliminate bias, a correction was required by subtracting the value of mean critical gap with gs where q is major road traffic flow (veh/sec) and sis the variance of the distribution. This research foundvout that Aceh approach was in gapping operation mode and Martadinata was in given priority one. Traffic flow level and traffic operation (one or two-way traffic) affected the distribution of traffic behaviour. This distribution of light vehicles behaviour was different significantly to that of motor cycles on Martadinata approach. The magnitude of critical gap was influenced by the performance of traffic. Its calculation was suitable for an approach with gapping operation mode.