0-6754 : review of tolling approaches for implementation within TxDOT's travel demand models : [project summary].
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2013-11-01
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Abstract:The urban travel demand models developed and applied by the Transportation Planning and Programming Division of the Texas Department of Transportation (TxDOT-TPP) are daily three-step models without feedback. In other words, trip generation, trip distribution, and traffic assignment are sequentially invoked for a single, full-day (24-hour) trip assignment. Estimates of highway travel times are used as the exclusive measure of impedance to travel, rather than travel costs or tolls.
TxDOT-TPP does not yet have a procedure to account for existing or planned toll roads in the regional models, and has been operating under the guidance established when toll roads existed as planned facility improvements only. Toll roads have been implemented only recently in a few small- to medium-sized urban areas still under the purview of TxDOT-TPP’s modeling team. To calibrate base-year travel models with operational toll roads or anticipate demands along planned tolled facilities, TxDOT-TPP needs a procedure to account for facilities that charge user fees.
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