Evaluation of level of service at few signalized intersections using Indian Highway Capacity Manual (Indo-HCM, 2018)

Efficiency of urban road networks depends mainly on the efficiency of intersections, as they form main bottle necks of the system. For Indian conditions, Level of Service (LoS) for signalized intersection were not defined before in IRC code books. In new Indian Highway Capacity Manual (Indo-HCM)- 2018, Chapter-6 has been added as signalized intersections to address the issues arising at signalized intersections in urban area. The intent of this paper is to briefly summaries the process followed and present the results obtained by adopting the methodology described in Indo-HCM- 2018 in determining LoS based on volume to capacity ratio (v/c) at two signalized intersections in Bangalore city, India. The results have shown that new Indo-HCM- 2018 overpredicts the saturation flow rate (SFR) in six approaches and under estimates two approaches of the eight approaches of the two intersections considered. As the saturation flow is higher, the capacity has also increased, which in turn produces the higher (v/c) ratio, depicting the LOS as ‘F’ and lesser signal timing. It does not replicate the actual field conditions.