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.
Our regional travel demand 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 regional model includes a 2015 and 2040 baseline forecast scenario.
Our subarea models are developed in the Dynameq platform. These models focus on route choice by simulating individual driver response to other drivers and roadway/intersection design. These models provide more realistic estimations of congestion and delay.