Abstract
Indonesian Highway Capacity Guidance or IHCG is a manual developed in 2014 to accommodate traffic characteristics which are no longer appropriate to the preceding manual (Indonesian Highway Capacity Manual or IHCM, established in 1997). From a preliminary study, there are still some differences between theoretical analysis (using IHCG) with the actual conditions. This study aims to obtain IHCG correction factor based on a comparison between predicted performance parameter of a signalized intersection (using IHCG) and measured data, in order to optimize IHCG development. Intersection performance parameters analyzed are the number of queue vehicles (NQ1 and NQ2), and queue length (QL). The model of the correction factor was determined with regression analysis, using DS value as the independent variable, and NQ1, NQ2, or QL differences value as the dependent variables. Implementation of the proposed correction factor of queue length on nearby intersections resulted that the corrected guidance could produce more accurate queue length against measured one by 12% deviation.
Highlights
Indonesian Highway Capacity Manual or IHCM [1] is a manual used to analyze the capacity and performance of roads in Indonesia since 1997
This research was conducted to obtain Indonesian Highway Capacity Guidance (IHCG) correction factor based on a comparison between IHCG results with measured data, in order to optimize IHCG development
It can be seen that there were still some differences between IHCG calculation result and field observation for all parameters of NQ1, NQ2, and QL. These differences can be minimized by using correction factor (FC), which includes the correction factor of queue vehicle number (FCNQ1 and FCNQ2), and the correction factor of queue length (FCQL)
Summary
Indonesian Highway Capacity Manual or IHCM [1] is a manual used to analyze the capacity and performance of roads in Indonesia since 1997. A preliminary survey was carried out on Gajah Intersection [4], a four-leg signalized intersection in East Semarang This survey was conducted to analyze how traffic conditions at intersections are viewed from the point of view of IHCM and IHCG. It showed that there were differences between theoretical analysis (predicted using IHCM and IHCG) with the real conditions. Using IHCG, the results were closer to the actual conditions compared to the results of IHCM, but some significant differences were still found This indicates that IHCG is quite better than IHCM, but some reference value still requires adjustment to the field conditions. This research was conducted to obtain IHCG correction factor based on a comparison between IHCG results with measured data, in order to optimize IHCG development
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