Activity-Based Travel Demand Models: A Primer (2014) / Chapter Skim
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Pages 129-132
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127 4 INTRODUCTION BACKGROUND Travel models are analytic tools that provide a consistent framework with which to understand the effects of transportation, land use, and demographic, economic, and policy changes on transportation system performance. Traditional 4-step or trip-based travel models are composed of a series of subcomponent models that indi vidually address aspects of travel demand and supply, such as trip generation, distribution, mode choice, and route choice, and which collectively generate estimates of travel demand choices and transportation system performance.
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128 Part 2: ISSUES IN ADOPTING INTEGRATED DYNAMIC MODELS SYSTEMS models use broad time periods, typically multihour and in some cases even daily time periods, they are unable to capture the impact of travel demand on network performance for shorter time periods. Static assignment models also do not adequately represent important network operational attributes like capacity and do not represent traffic dynamics such as the buildup and dissipation of congestion (Lawe et al.
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129 Chapter 4: INTRODUCTION Advanced models as described represent an area of travel behavior research and practice in which theory, methods, and tools are rapidly evolving. Because of the dynamic nature of this field, this part of the guide identifies general implementation challenges and potential next steps for addressing these challenges and is intended to inform efforts by state DOT, MPO, and other transportation agency staff as they consider and pursue the development of integrated dynamic models.
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