Calibration of Microsimulation Models to Field Measured Saturation Flow Rates on Signalized Arterials
In recent years, microsimulation has been increasingly used to analyze traffic operations along signalized arterial corridors. Such a tool provides many advantages, including the ability to analyze the interactions of adjacent facility elements. As microsimulation has become more common, agencies have developed calibration protocols to ensure that a microsimulation model accurately replicates real world conditions. Common protocols consider such metrics as travel time and throughput, but these protocols do not assure that the appropriate saturation flow rate is modeled at intersections. Modeling the appropriate saturation flow rate is essential if the corridor is to be tested using increased traffic demands. In this research, the saturation flow rate produced in the VISSIM microsimulation platform was measured under default and alternate parameters using nationally recognized methods. This research demonstrates that several driving behavior parameters should be modified to ensure that modeled behaviors replicate those in the field. The research further discusses how users should adjust these parameters to more accurately reflect local conditions. The results can be used as a starting point for agencies developing local default parameters for VISSIM models within their jurisdiction.