DEVELOPMENT OF A NEW METHOD OF CAPACITY ANALYSIS AT UNSIGNALIZED INTERSECTIONS UNDER MIXED TRAFFIC FLOW PRELIMINARY DESIGN FOR INDONESIA

In general, capacity at unsignalized intersection is measured with two approaches, e.q. gap
acceptance procedure (GAP) and empirical regression method. GAP method mostly used in
United States and Europen countries which is based on critical gap acceptance and follow up
times of vehicles from the minor road. Empirical regression method is developed by a large
number of measurement field data in modern British street to get the representative result.
The third method is conflict technique with pragmatical simplified concept where the
interaction and impact between flows/ streams from each approaches of intersection is
brought through mathematically formulated. Indonesia Highway Capacity Manual (IHCM-
1997) is the current approach to measure the capacity and traffic performance (degree of
saturation, delay and queue) ) based on research study of Swedish Road and Traffic Research
Institute, SWEROAD. Study were conducted in Indonesia from December 1990 to February
1997.
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