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Table 8 <br />Gravity Model Parameters <br />2008 Kittitas County Transportation P lamtlng Model <br />Trip Beta Alpha Constant <br />Purpose Exponent Exponent <br />HW 2.00 -0.2 100 <br />WH 2.00 -0.2 100 <br />HO 2.70 -0.2 100 <br />OH 2.70 -0.2 100 'C <br />NHB 2.80 -0.1 100 <br />Truck 2.2 -0.5 100 -,;- <br />The volumes and volume/capacity ratios for links or streets were plotted for <br />comparison with the future year alternatives. These colors range light green through <br />dark green, orange, red, and dark red to show increasing amounts of congestion. <br />Kittitas County, Washington Transportation Model -May 2009 Page 39