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of travel and the derivation of appropriate travel routes. In the context of network <br />analysis, the capacities are used to identify deficiencies and recommend improvements. <br />In both cases, it is desired that the capacities used in the model be as accurate and <br />realistic as possible. These capacities were modified slightly during model calibration to <br />better match local conditions. These were further revised during the 2009 update based <br />upon the new traffic count and land use data, including adding 200 vehicles per hour <br />per direction for links with Two -Way Left Turn Lanes. Table 2 represents the capacities <br />used for the model. <br />Table 2 <br />Link (Roadway) Type/Capacities <br />2005 Kittitas County Model <br />Link Capacity <br />Type Facility Type (vphpl) <br />1 Interstate Principal Arterial (Rural Freeway) 2000 <br />2 <br />Principal Arterial (Rural) <br />1200 <br />3 <br />Freeway Ramps <br />1200 <br />6 <br />Minor Arterial (Rural) <br />1200 <br />7 <br />Major Collector (Rural) <br />1000 <br />8 <br />Minor Collector (Rural) <br />800 <br />9 <br />Local (Rural) <br />600 <br />11 <br />Interstate Principal Arterial (Rural Freeway) <br />2000 <br />12 <br />Expressway Principal Arterial (Urban) <br />1600 <br />14 <br />Principal Arterial (Urban) <br />1400 <br />16 <br />Minor Arterial (Urban) <br />1200 <br />17 <br />Collector (Urban) <br />800 <br />19 <br />Local (Urban) <br />600 <br />99 <br />Trail <br />NA <br />Length <br />In VISUM, all lengths are automatically calculated. The program will calculate lengths <br />for each link during data entry and any subsequent future modifications. After the link <br />lengths were calculated for the Kittitas County model, link lengths were checked to <br />confirm that the function was working properly. Typically in a model for a county that <br />has relatively long travel times on the externals the external link lengths are adjusted. <br />For this model, the additional travel times in and out of the model area were coded into <br />the centroid connectors. The model scale is set in the Network Parameters section. This <br />Kittitas County, Washington 'Transportation Model - May 2009 Page 15 <br />