ABM Components

This page provides an overview of the activity-based model components that simulate demand in a disaggregate manner. For more information on the inputs, outputs, and parameters of the ABM components, please see the ABM Parameters and ABM Results pages.

Disaggregate Demand Model Sequence

The disaggregate demand component structure, shown in the figure below is very similar to the SERPM 7 design. The green boxes in the figure highlight the new model components, which are discussed in more detail in the Future Mobility section.

The choice sequence begins with long-term choices of school and work location for students and workers, followed by household-level choices on car ownership, technology and transportation network company (TNC) membership. Next, for each person in the synthetic population, the level, location and timing of mandatory and non-mandatory travel are simulated. Coordinated travel within a household, fully-joint travel, is also simulated.

Once the number, location and timing of tours is simulated, the tour-level choices are made around mode and, if there are intermediate stops, the stop location and timing, followed by the trip mode.