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Indian River County I 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 Trip Rate Assessable Daily VMT Ratio to <br /> Excluding Tiering Trip Length Mean <br /> Single Family(Detached) 7.811 6.621 51.701 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 • <br /> Incomem <br /> Less than 1,000 sf $34,135 <br /> 1,000 to 1,499 sf $45,489 <br /> 1,500 to 2,499 sf $62,563 <br /> 2,500 sf or more $79,443 <br /> Average of All Houses $62,831 <br /> Source:2011 American Household Survey <br /> Table B-4 <br /> NHTS VMT Annual VMT by Income Category <br /> Ratio2009 NHTS Travel Data by Annual Days DailyVMT to Normalized, <br /> Annual HH Income VMT/HH Mean <br /> to 0.995 <br /> Average of$34,135 17,787 365 48.73 0.736 0.740 <br /> Average of$45,489 20,103 365 55.08 0.831 0.835 <br /> Average of$62,563 24,069 365 65.94 0.995 1.000 <br /> Total (All Homes) 24,181 365 66.25 1.000 - <br /> Average of$79,443 28,3491 3651 77.671 1.172 1.178 <br /> Source:2009 National Household Travel Survey Database,Federal Highway Administration <br /> Tindale-Oliver&Associates, Inc. Indian River County <br /> June 2014 B-2 Impact Fee Update Study <br /> 20� <br />