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