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LU24 Wholesale are those land uses which are for wholesale sale or storage. <br />Measured in thousand square feet. <br />Trip Generation <br />After the collected land use data was distributed to the model zone system, the number <br />of trips generated by each zone was calculated. This procedure, called trip generation, is <br />a compilation of several mathematical formulas that determine the number of trips <br />produced and attracted to each model zone. <br />Many transportation engineering projects use the Institute of Transportation Engineer's <br />(ITE) Trip Generation report to determine trip generation for proposed projects. Research <br />by ITE has established a series of trip generation rates that, when multiplied by amount <br />of proposed development (e.g., number of dwelling units, employees of commercial or <br />industrial, etc.), produce an estimate of the total number of vehicle trips entering or <br />exiting the development. <br />While the above application is suitable for many traffic engineering projects, modeling <br />uses a more disaggregate trip generation approach. When a trip distribution model <br />(such as the one used in VISUM) is applied to origins and destinations, different trip <br />purposes exhibit different travel characteristics. For example, the characteristics of a <br />home-to-work trip are different from a home-to-shopping trip. If trip generation <br />estimates were made simply following just the ITE rates, no distinction could be made. <br />Therefore, it is important that the model generate different trip productions (origins) <br />and attractions (destinations) for different trip purposes so that different travel <br />characteristics can be accounted for in the gravity model. <br />In its NCHRP reports 187 and 365, the Transportation Research Board (TRB) describes a <br />methodology for trip generation that includes the following trip purposes: <br />• Home-Based Work (HBW) trips, <br />• Home-Based Other (HBO) trips, and <br />• Non-Home-Based (NHB) trips. <br />These three trip purposes are typically used with most daily transportation models. <br />Because of the spatial structure of the Kittitas County model, it was decided to <br />disaggregate the trip purposes. The Home-Based Work trips were divided into trips <br />Kittitas County, Washington Transportation Model -May 2009 Page 29