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APPENDIX: Federal Highway Administration Trip Table Estimation Method
Pages 174-178

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From page 174...
... The 2 billion total trips in 2008 are a 100 percent increase since 1995 and a 50 percent increase since the 2001–2002 National Household Travel Survey. The amount of long-distance trip making by rail grew the most on a percentage basis, up nearly 250 percent from 1995 to 2008.
From page 175...
... Trip Generation Model Linear regression models were estimated by using employment and population variables to predict 1995 ATS trips at the state level. The production and attraction equations by trip purpose are shown in Equations 1 to 4.
From page 176...
... ; and visitors bureau data from Las Vegas, Niagara Falls, and Orlando. The generated values are allocated to their production and attraction zones on the basis of the nonbusiness trip distribution (Equation 6)
From page 177...
... + ln ( 2 × employment j ) − 2.34 × ln (distance ij )
From page 178...
... Trips were added to account for travel to National Park Service locations and for a limited number of other destinations such as Niagara Falls, Orlando, and Las Vegas. On the basis of information from National Park Service visitor surveys, the model developer used a factor of 0.05 to estimate the total number of visitors arriving by bus and a factor of 0.88 to convert total visitations to long-distance trips.

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