The Delays for Signalized Intersection Using ATCS Data and Field Survey Method at Kerten-Intersection of Surakarta

Abstract

The increasing of traffic volume in Surakarta has caused an increasing of congestion in several road networks. Traffic jam phenomenon at intersections during peak hour can be found at some signalized intersections, especially at Kerten-Intersection in Surakarta. The Local Government through the Communication, Informatics and Transportation Department (Dishubkominfo) Surakarta is developing an integrated traffic management control system named Area Traffic Control System (ATCS). The aim of ATCS is to enable the vehicle movement continuously and minimize the delay at an intersection. This research aims to determine the factors which are considered in the analysis by using Indonesian Highway Capacity Manual (IHCM 1997) and field survey methods, to calculate the delay of each method, and then to compare both values. The implementation of manual traffic counts survey carried out for a day in the morning peak hour. It is sourced from traffic counting data from ATCS detector of Dishubkominfo Surakarta after converted in passenger cars unit. The obtained data from field observation for calculating field delay are: number of waiting vehicle every 15 second, stopped (in red and amber time) and not stopped vehicles (in green and amber time). Findings so far, the average delay calculated by IHCM 1997 method is 59.29sec/pcu, while the average field delay is 16.91sec/pcu. Based on the comparison, it can be known that the field delay is lower than IHCM 1997 delay. It is caused by the differences in withdrawal traffic flow data that will be used in delay calculation analysis. Inaccurate of determining the adjustment factors (which are: effective width, city size, side friction, turning movement, vehicles stopped ratio and turn at each approach) will also cause inaccurate in the delay value.