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..
Our regional model is a traditional 4-step model developed in the EMME platform. The base model update was completed in 2015. In 2017 the model was expanded to include all of Lewis County. The 2018-2020 update expanded the model to include all of Grays Harbor County.
Our regional dynamic traffic assignment model is developed in the Dynameq platform. This model covers Thurston County and parts of Pierce and Lewis Counties. Dynamic Traffic Assignment (DTA) models focus on route choice by simulating individual driver response to other drivers and roadway/intersection design and provide more realistic estimations of congestion and delay.