Submodels

In Soundcast, Daysim models estimate travel behavior for people living within the 4-county PSRC region. While this travel makes up the majority of all activity, there are other movements that must be included outside of the Daysim framework. The largest source of additional travel demand comes from freight movements in trucks, within and across the region and to points outside as well. Personal trips to/from external locations must also be considered separately since this places additional strain on roadways, especially on the region's edges and along through corridors like I-5. Special land use types like airports and a variety of military bases must also be considered in their own right. The following sections detail these supplemental submodels in Soundcast:

• Trucks
• Externals
• Airport

Though bicycle trips in the region are modeled by Daysim, the route choice is part of a separate submodel.

• Bike Assignment and Mode Choice