A Guidebook for Using American Community Survey Data for Transportation Planning (2007) / Chapter Skim
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Pages 141-150
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The first case study shows how to estimate an auto ownership model using ACS PUMS data. The second case study describes how ACS data may be used in the validation of a trip distribution model.
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9.1.9 Examples of Use This section provides some examples of presenting travel demand modeling analyses. Figure 9.1 shows a home-based work trip length frequency distribution,101 and Figure 9.2 shows out-of-county 142 A Guidebook for Using American Community Survey Data for Transportation Planning 99 Examples of DOTs/MPOs where trip distribution calibration efforts were done using Census data are: Indiana DOT, Vermont Agency of Transportation, Mass Highway, Chicago Area Transportation Study (personal correspondence)
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Travel Demand Modeling Analyses Using ACS Data 143 Figure 9.2. Out-of-county commute map.
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The case studies provide a step-by-step description of how one might obtain the data, do the computations, and present the results. 144 A Guidebook for Using American Community Survey Data for Transportation Planning 102 North Jersey Transportation Planning Authority, 2003.
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9.3.1 Analysis 1 -- Estimation of Auto Ownership Model This case study illustrates how an auto availability model can be estimated using ACS data. Auto availability models can be estimated using disaggregate household data.
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When working with dollar amounts from different years, it is necessary to convert the amounts into dollars from a common year (after applying the adjustment factor 146 A Guidebook for Using American Community Survey Data for Transportation Planning 104 No housing unit will be sampled more than once in a five-year period. 105 Correspondence with Nicholas Spanos of the Census Bureau, May 27, 2005.
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and reported travel time data for these origin-destination pairs. Travel Demand Modeling Analyses Using ACS Data 147 107 These factors can be found at the following URL: http://www.bls.gov/cpi/cpiurstx.htm.
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These factors can cause additional differences between ACS and model results. 148 A Guidebook for Using American Community Survey Data for Transportation Planning 0 5 10 15 20 25 0-5 5-10 10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-60 60-75 75-90 More Travel Time (in Minutes)
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, Travel Demand Modeling Analyses Using ACS Data 149 108 The DOTs and MPOs that have indicated the use of Census data in this context include: Des Moines MPO, Minnesota DOT, Vermont Agency of Transportation, Mass Highway, Broward County MPO, Hampton Roads Planning District Commission, Chittenden County MPO, Mid-Ohio Regional Planning Commission, Pioneer Valley Planning Commission, Tulare County Association of Governments, Pima Association of Governments, Yakima Valley Conference of Governments, and Caliper Corporation.
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150 A Guidebook for Using American Community Survey Data for Transportation Planning 111 At Caliper Corporation, CTPP data also are used for calibrating a time-of-day model and a destination choice gravity model related to work trips. 112 Cambridge Systematics, Inc., 1997, "Vehicle Availability Modeling." Prepared for FHWA.
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