1.1 Model System

The Northeast Regional Planning Model Activity-Based (NERPM-AB) system is comprised of two primary components, the DaySim activity-based demand model and the PTV Visum network supply model. DaySim is a set of travel demand forecast models that predict household and person travel choices at a microzone-level on a minute-by-minute basis. PTV Visum is used to assign this travel demand to roadway and transit networks, and to produce estimates of network performance. In addition, PTV Visum provides an overall framework and graphical user interface for users to configure and execute the overall model system. These two primary components are supported by a number of auxiliary models and tools. The purpose of this document is to provide users with a guide to the application of the NERPM-AB.