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Indian River County 1 Impact Fee Update Study <br />Demand Component <br />This appendix presents the detailed calculations for the demand component of the <br />transportation impact fee update. <br />Interstate and Toll Facility Discount Factor <br />Table B-1 presents the interstate and toll facility discount factor used in the calculation of <br />the transportation impact fee. This variable is based on data from the Greater Treasure <br />Coast regional travel demand model, specifically the 2035 projected vehicle miles of travel, <br />accounting for roadway improvements included in the 2035 Long Range Transportation <br />Plan. It should be noted that discount factor excludes external -to -external trips, which <br />represent traffic that goes through Indian River County, but does not necessarily stop in the <br />county. This traffic is excluded from the calculations since it does not come from <br />development within the county. The I/T discount factor is used to reduce the VMT that the <br />impact fee charges for each land use. <br />Table B-1 <br />Interstate/Toll Facility Discount Factor <br />Roadway <br />1-95 & Turnpike (SR 19) <br />Other Roads <br />Total (All Roads) <br />Total (Interstate/Toll Roads) <br />VMT <br />(2035) <br />838,313 <br />4,005,935 <br />4,844,247 <br />838,313 <br />VMT <br />17.3% <br />82.7% <br />100.0% <br />17.3% <br />Source: Greater Treasure Coast Regional Planning Model v3.4 <br />Single Family Residential Trip Generation Rate Tiering <br />As part of this study, an update to the tiering of the assessed impact fee for the single family <br />residential (detached) land use, to ensure equity by size of home, is included. To facilitate <br />this, an analysis was completed on the comparative relationship between housing size and <br />household travel behavior. This analysis utilized data from the 2009 National Household <br />Travel Survey (NHTS) and the 2011 American Housing Survey (AHS) to examine overall trip - <br />making characteristics of households in the United States. <br />Table B-2 presents the existing trip characteristics being utilized in the current adopted <br />impact fee schedule for the single family (detached) land use. The 2009 NHTS database was <br />used to assess average annual household vehicle miles of travel (VMT) for various annual <br />Tindale -Oliver & Associates, Inc. Indian River County <br />June 2014 <br />B-1 Impact Fee Update Study <br />7_03 <br />