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Indian River County 1 Impact Fee Update Study <br />household income levels. In addition, the 2011 AHS database was used to compare median <br />annual family/household incomes with housing unit size. It is important to recognize that <br />the use of the income variable in each of these databases is completed simply to provide a <br />convenient linking mechanism between household VMT from the NHTS and housing unit <br />size from the AHS. <br />Table B-2 <br />Calculated Single Family Trip Characteristics <br />Calculated Values <br />Excluding Tiering <br />Single Family (Detached) <br />Assessable Ratio to <br />Trip Rate Daily VMT <br />Trip Length Mean <br />7.81 <br />6.62 <br />51.70 <br />1.00 <br />Source: FL Studies for LUC 210, shown later in this appendix <br />The results of the NHTS and AHS analyses are included in Tables B-3 and B-4. First, the data <br />shown in Table B-3 indicates that the average income in the U.S. for families/households <br />living in housing units between 1,500 and 2,499 square feet in size ($62,563) is slightly <br />lower than the overall average income for the U.S. ($62,831). Then, in Table B-4, annual <br />average household VMT was calculated from the NHTS database for a number of different <br />income levels and raged related to the resulting AHS income data in Table B-3. <br />Table B-3 <br />Annual Income by Housing Size <br />2011 AHS Average Income <br />Data by Housing Size <br />Annual <br />Income(1) <br />Less than 1,000 sf <br />$34,135 <br />1,000 to 1,499 sf <br />$45,489 <br />1,500 to 2,499 sf <br />$62,563 <br />2,500 sf or more <br />$79,443 <br />Average of All Houses <br />$62,831 <br />Source: 2011 American Household Survey <br />Table B-4 <br />NHTS VMT Annual VMT by Income Category <br />2009 NHTS Travel Data by Annual <br />Annual HH Income VMT/HH <br />Average of $34,135 17,787 <br />Ratio to <br />Days Daily VMT Mean <br />365 48.73 0.736 <br />Normalized <br />to 0.995 <br />0.740 <br />Average of $45,489 20,103 <br />365 55.08 0.831 <br />0.835 <br />Average of $62,563 24,069 <br />365 65.94 0.995 <br />1.000 <br />Total (All Homes) 24,181 <br />365 66.25 1.000 <br />- <br />Average of $79,443 28,349 <br />365 77.67 1.172 <br />1.178 <br />Source: 2009 National Household Travel Survey <br />Database. Federal Hiehwav Administration <br />Tindale -Oliver & Associates, Inc. <br />June 2014 <br />Indian River County <br />B-2 Impact Fee Update Study <br />