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Author: Yong Zhao Publisher: ISBN: Category : Traffic estimation Languages : en Pages : 52
Book Description
The future operations of transportation systems involve enormous uncertainty - in both input and model parameters. This work investigates the stability of contemporary transport demand model output by quantifying variability in model input, such as zonal socioeconomic data and trip generation rates. It simulates the propagation of their variation through a series of common demand models over a simplified twenty-five-zone network. The results suggest that uncertainty may be compounded over a series of models and highly correlated across output. The propagated uncertainty varies remarkably in link flows, thus, some link flows may be more uncertain than others. The final step model, trip assignment, may reduce prior increased uncertainty through the first three steps, but generally could not lessen the uncertainty lower than the input uncertainty. Mispredictions at early stages (e.g., trip generation) in multi-stage models appear to amplify across later stages; thus, improvements to these models and their estimates are sorely needed.
Author: Yong Zhao Publisher: ISBN: Category : Traffic estimation Languages : en Pages : 52
Book Description
The future operations of transportation systems involve enormous uncertainty - in both input and model parameters. This work investigates the stability of contemporary transport demand model output by quantifying variability in model input, such as zonal socioeconomic data and trip generation rates. It simulates the propagation of their variation through a series of common demand models over a simplified twenty-five-zone network. The results suggest that uncertainty may be compounded over a series of models and highly correlated across output. The propagated uncertainty varies remarkably in link flows, thus, some link flows may be more uncertain than others. The final step model, trip assignment, may reduce prior increased uncertainty through the first three steps, but generally could not lessen the uncertainty lower than the input uncertainty. Mispredictions at early stages (e.g., trip generation) in multi-stage models appear to amplify across later stages; thus, improvements to these models and their estimates are sorely needed.
Author: Brian W. Sloboda Publisher: J. Ross Publishing ISBN: 160427008X Category : Business & Economics Languages : en Pages : 321
Book Description
In recent years, transportation systems have been judged on performance-based outcomes, thus, quantitative methods have become increasingly important to such assessments. This definitive reference will equip you with state-of-the-art statistical tools used in transportation modeling, how to interpret results and analyze the implications of those results.
Author: Jorge Freire Sousa Publisher: Springer Science & Business Media ISBN: 3319046306 Category : Technology & Engineering Languages : en Pages : 474
Book Description
This volume brings together works resulting from research carried out by members of the EURO Working Group on Transportation (EWGT) and presented during meetings and workshops organized by the Group under the patronage of the Association of European Operational Research Societies in 2012 and 2013. The main targets of the EWGT include providing a forum to share research information and experience, encouraging joint research and the development of both theoretical methods and applications, and promoting cooperation among the many institutions and organizations which are leaders at national level in the field of transportation and logistics. The primary fields of interest concern operational research methods, mathematical models and computation algorithms, to solve and sustain solutions to problems mainly faced by public administrations, city authorities, public transport companies, service providers and logistic operators. Related areas of interest are: land use and transportation planning, traffic control and simulation models, traffic network equilibrium models, public transport planning and management, applications of combinatorial optimization, vehicle routing and scheduling, intelligent transport systems, logistics and freight transport, environment problems, transport safety, and impact evaluation methods. In this volume, attention focuses on the following topics of interest: · Decision-making and decision support · Energy and Environmental Impacts · Urban network design · Optimization and simulation · Traffic Modelling, Control and Network Traffic Management · Transportation Planning · Mobility, Accessibility and Travel Behavior · Vehicle Routing
Author: Caroline Rodier Publisher: ISBN: Category : Air quality management Languages : en Pages : 74
Book Description
Concerned citizens across the United States are increasingly asking officials about the effects of proposed new highways and their alternatives, such as transit and road pricing, on how their communities will grow, the air their children will breathe, and the amount of time they will have to spend in traffic commuting to work. It is widely acknowledged, however, that the models used to assess these effects have limited accuracy and sensitivity to alternatives to highway expansion. This study attempts to move beyond the issues of uncertainty in models used to forecast the travel, land use, and air quality effects of transportation projects and policies by (1) reviewing the literature on error and uncertainty in travel and land use models to understand key sources, likely confidence bounds, and potential biases; (2) conducting interviews with modeling experts to gain insight into how uncertain models may be improved and better applied in transportation studies; and (3) presenting a series of cases studies that illustrate innovative and, possibly, more credible approaches to modeling given different study objectives, model capability, and knowledge of model uncertainty.
Author: Benjamin Gerry Perez Publisher: Transportation Research Board National Research ISBN: 9780309258289 Category : Business & Economics Languages : en Pages : 276
Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Report 722: Assessing Highway Tolling and Pricing Options and Impacts provides state departments of transportation (DOTs) and other transportation agencies with a decision-making framework and analytical tools that describe likely impacts on revenue generation and system performance resulting from instituting or modifying user-based fees or tolling on segments of their highway system. Volume 2: Travel Demand Forecasting Tools provides an in-depth examination of the various analytical tools for direct or adapted use that are available to help develop the forecasts of potential revenue, transportation demand, and congestion and system performance based on tolling or pricing changes. Volume 1: Decision-Making Framework includes information on a decision-making framework that may be applied to a variety of scenarios in order to understand the potential impacts of tolling and pricing on the performance of the transportation system, and on the potential to generate revenue to pay for system improvements"--Publication information.
Author: National Research Council (U.S.). Transportation Research Board Publisher: ISBN: Category : Choice of transportation Languages : en Pages : 258
Author: Akimasa Fujiwara Publisher: Springer Science & Business Media ISBN: 4431543791 Category : Science Languages : en Pages : 305
Book Description
This book aims to provide a good understanding of and perspective on sustainable transport in Asia by focusing on economic, environmental, and social sustainability. It is widely acknowledged that the current situation and trends in transport are not always sustainable in Asia, due in part to the fast-growing economy and the astounding speed of urbanization as well as least-mature governance. As essential research material, the book provides strong support for policy makers and planners by comprehensively covering three groups of strategies, characterized by the words “avoid” (e.g., urban form design and control of car ownership), “shift” (e.g., establishing comprehensive transportation systems and increasing public transportation systems for both intracity and intercity travel), and “improve” (e.g., redesign of paratransit system, low-emission vehicles, intelligent transportation systems, and eco-life). These are elaborated in the book alongside consideration of the uncertainty of policy effects in the future. The book is also valuable for scholars and scientists because of the diverse methodologies presented and proposed herein. Among those are the four-step model with full feedback mechanisms, the bi-level programming model with sustainability goals, data envelopment analysis and stochastic frontier analysis approaches, structural equation models, discrete and/or continuous choice models, copula-based models, survival models, and driving risk models with short-term memory. Using data collected from more than ten Asian cities, including those in both developed and developing nations, the pathway to sustainable transport in Asia gradually becomes clear.
Author: National Research Council (U.S.). Transportation Research Board Publisher: ISBN: Category : Choice of transportation Languages : en Pages : 172
Author: Yong Zhao
Author: Yong Zhao
Author: Brian W. Sloboda
Author: Jorge Freire Sousa
Author: 
Author: Caroline Rodier
Author: Sriram Krishnamurthy
Author: Benjamin Gerry Perez
Author: National Research Council (U.S.). Transportation Research Board
Author: Akimasa Fujiwara
Author: National Research Council (U.S.). Transportation Research Board