Calibrating the traffic volumes in the model is the second step in calibration and is typically included for all microsimulation models.

This step is completed by comparing the turning movement volumes and link volumes in the model to local conditions. Traffic volumes typically fall within established calibration targets. Traffic volumes are typically calibrated at all locations within the model. If this is not possible for some large networks, calibration of several key locations is acceptable.

When calibrating traffic volumes on a surface street with parallel streets or a network of streets, analysts can use conditional turn movements to define turn percentages. Additionally, a full OD table can be manually coded to minimize differences in modeled volumes.

The FHWA microsimulation guidelines do not demand traffic volume calibration.