Calibration Methodology of Microsimulation Model for Unsignalized Intersection under Heterogeneous Traffic Conditions

Abstract

Indian unsignalized intersections operate quite differently in comparison to their western counterparts. To address traffic heterogeneity, lane indiscipline, non-priority rules, lack of movement control, and non-uniform road geometry that exist on Indian roads, microsimulation is the best-suited technique. While a few attempts have been made on the calibration of signalized intersection under heterogeneous traffic, unsignalized one is still an unexplored area. Hence, the present study proposes a calibration methodology of PTV VISSIM simulation model for an unsignalized intersection under heterogeneous traffic condition. The 85th percentile accepted gap time is utilized as a performance measure in calibration. Calibration parameters are identified using Morris sensitivity analysis, and their optimum values are obtained using genetic algorithm (GA). Simulation results show that VISSIM provides reasonable accepted gap time for the unsignalized intersection. Overall, it is concluded that, using the proposed methodology, the developed network performs well and replicates field situation efficiently.