The vehicle type effect to the mixed traffic flow performance (case of study: Soleh Iskandar road, Bogor, Indonesia)

Many cities in developing South East Asia countries face a traffic congestion problem due to the enormous number of private vehicles operating on urban roads. Various traffic management policies are implemented to minimize any loss of congestion problems. Traffic management policies and strategies are established based on traffic analysis and calculation from field observation data which commonly use passenger car units (PCU) as the calculation approach. However, this approach becomes more challenging in an area with mixed traffic where the passenger car is not the majority of the traffic proportion, e.g. in many SEA cities. This study emphasizes the understanding of the hypothesized changes in the traffic performance on the same number of vehicles under the different proportion of motorcycles as a fundamental understanding for PCU application. To achieve the study goal, a traffic microsimulation-based analysis was conducted. The model was built based on the Soleh Iskandar road geometric and traffic data in Bogor, West Java, Indonesia. The motorcycle flows were simulated from 45% to 90% of total flow proportions that consistently affected the overall traffic performance. The consistent changes in traffic performance indicator swift in the 85% and 90% of motorcycles.