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Indian River County 1 Impact Fee Update Study <br />Demand Component <br />Travel Demand <br />The amount of transportation system consumed by a unit of new land development is <br />calculated using the following variables and is measured in terms of the vehicle miles of <br />new travel a unit of development consumes on the existing road system. <br />• Number of daily trips generated; <br />• Average length of those trips; and <br />• Proportion of travel that is new travel, rather than travel that is already traveling on <br />the road system and is captured by new development. <br />As part of this update, the trip characteristics variables were obtained primarily from two <br />sources: (1) trip characteristics studies previously conducted throughout Florida by TOA <br />(Florida Studies Database), and (2) the Institute of Transportation Engineers' (ITE) Trip <br />Generation report (9th edition). <br />The Florida Studies Database is included in Appendix B. This database was used to <br />determine VMT, which is developed from trip length, percent new trips, and trip rate for <br />most land uses in the fee schedule. The data in the trip characteristics database is based on <br />actual land use studies and was collected throughout Florida using machine traffic counts <br />and site specific land use origin -destination surveys. In addition, trip generation data from <br />the 1TE 9th Edition Trip Generation report was used. In instances where trip generation was <br />available from the 1TE Trip Generation report and the Florida Studies Database, a blended <br />average calculation was used to increase the sample size. <br />Interstate and Toll Facility Discount Factor <br />This variable is used to recognize that improvements to Interstate highways are funded by <br />the State using earmarked and Federal funds, while toll facility improvements are funded <br />with toll revenues. Typically, impact fees are not used to pay for these improvements, and <br />the portion of new development's travel occurring on the interstate/toll facility system <br />usually is eliminated from the total travel for each land use. <br />To calculate the interstate and toll (I/T) facility discount factor, the loaded highway network <br />file was generated for the Greater Treasure Coast Regional Planning Model v3.4 <br />(GTCRPM). A select link analysis was run for all traffic analysis zones located within Indian <br />Tindale -Oliver & Associates, Inc. Indian River County <br />June 2014 107 Impact Fee Update Study <br />14 2 <br />