Traffic on the roads results from individuals deciding where, when, and how to travel. Decisions such as where to live, work, and shop also impact travel behavior. A travel demand model is a set of mathematical procedures and equations that represent the variety of transportation choices people make, and how those choices result in trips on the transportation network.
TRPC maintains two types of travel demand models for Thurston County. The models have a base year of 2018, and a future year of 2045.