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Background Data and Modeling Assumptions <br />The primary goal of this transportation planning model is to simulate the PM peak hour <br />of travel on the roadway network in Kittitas County. In order for this simulation to be <br />effective, it is important to obtain all transportation related data for that peak hour (a <br />"snapshot" of time). It was also decided that the traffic model would replicate a 2008 <br />weekday evening (PM) peak -hour. <br />The following section describes the various data used to develop the model. It is <br />subdivided into two sections corresponding to the two primary components of a <br />transportation planning model: <br />network characteristics <br />travel characteristics data. <br />NETWORK CHARACTERISTICS DATA <br />After establishing the model area, the existing model was reviewed and updated. All <br />roadways classified as collector or greater throughout Kittitas County were included. <br />As noted previously, the network was reviewed by Kittitas County Staff and some <br />additional network facilities were added. Data is encoded to describe both the links and <br />the nodes. A link is a vector that describes connectivity between two nodes. A node is <br />an end point of a link. Typically, a node can be an intersection or an intermediate point <br />between intersections. <br />This model was developed using the geographically accurate NAVTEQ data set. Much <br />of the data was already coded. This data was refined during the model development <br />process. <br />Kittitas County, Washington Transportation Model — May 2009 Page 9 <br />