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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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      <title>TOWARDS ESTIMATING THE IMPACT OF THE DALLAS-FORT WORTH REGIONAL AIRPORT ON GROUND TRANSPORTATION PATTERNS</title>
      <link>https://trid.trb.org/View/37882</link>
      <description><![CDATA[This study of the impact of the Dallas-Forth Worth Regional Airport on ground transportation of this region, focusses on the isolation of changes in ground transportation pattern that can be attributed to the new regional airport.  The research is directed toward producing results and developing methodology that can be applied to evaluating the impact of other major new regional airports.  The research explores the possibility of relating ground traffic volumes with routinely-kept data on airport activity.  Details are given of the procedure in which models will be developed for estimating changes in ground transportation patterns and a flow chart diagramming the logical procedure of this task is presented.  The different concepts represented here include traffic reassignment, trip generation, trip distribution, modal split, and revised traffic assignment.  Disaggregate behavioral models will be developed of both intercity and regional modal split.  Airport characteristics related to ground transportation patterns will be identified, defined and measured.]]></description>
      <pubDate>Wed, 13 Aug 1975 00:00:00 GMT</pubDate>
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      <title>MODAL SPLIT MODELS FOR AIRPORT ACCESS</title>
      <link>https://trid.trb.org/View/24562</link>
      <description><![CDATA[This report discusses and calibrates different modal split models which predict the share of access trips carried by an airport limousine service.  The purpose of the analysis was to determine which of several alternative models are best suited for this prediction and to establish the nature of the demand itself.  Unlike comprehensive demand models, modal split models assume that the total number of access trips is fixed and must merely be "split" between access modes.  The underlying assumption is that the level of service provided by the different modes does not affect the total demand for air trips.  Since the demand for air transportation is indeed, probably insensitive to moderate changes in access systems, modal split models seem appropriate for a first look at airport access.  The report discusses two general forms of modal split models, aggregate and disaggregate, and their application to airport access. Aggregate models are calibrated with zonal averages of passengers and trip characteristics.  Disaggregate models, attempt to explain intrazonal as well as interzonal variations.  The development of the disaggregate and aggregate modal split models are presented in two separate sections.  The authors have attempted to calibrate models which would predict the share of one mode only - limousine. It was felt that a one-mode model would be sufficient to evaluate the various model formulations and calibration techniques to be tested.]]></description>
      <pubDate>Thu, 05 Sep 1974 00:00:00 GMT</pubDate>
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