Search Results

Managed lane travelers: do they pay for travel as they claimed they would?

Description: "This study examined if travelers are paying for travel on managed lanes (MLs) as they indicated that they would in a 2008 survey. To achieve the objectives, an Internet-based stated preferences (SP) survey of Houston's Katy Freeway travelers was conducted in 2010. Three survey design methodologies-Db-efficent, random level generation, and adaptive random-were tested in this survey."
Date: May 2011
Creator: Devarasetty, Prem Chand; Shaw, W. Douglass & Burris, Mark
Item Type: Report
Partner: UNT Libraries Government Documents Department

Transportation for humanity: meeting the needs in the colonias

Description: "The goal of the research was to access the current transportation challenges facing residents of the colonias and determine the feasibility of vehicle procurement through donations or at-cost purchases from a variety of entities and/or individuals to support the program, and recommendations for alternative funding mechanisms to support the local community centers in their efforts to provide transportation to the colonias population."
Date: September 2010
Creator: Storey, Beverly B. & Jasek, Debbie
Item Type: Report
Partner: UNT Libraries Government Documents Department

Performance measures for metropolitan planning organizations

Description: "The aim of this project is to consolidate available knowledge and provide guidance to transportation agencies, specifically MPOs, to help them incorporate performance measurement relating to transportation planning and operations. This research includes a survey of agency practices and agency needs, development of guidance on effective performance measurement and allied issues of strategic planning, goal setting, and data collection."
Date: April 2012
Creator: Moore, Devin; Ramni, Tara; Norboge, Nicolas & Turnbull, Katherine
Item Type: Report
Partner: UNT Libraries Government Documents Department

Predicting the incremental effects on transit ridership due to Bus-On-Shoulder operations

Description: "Bus-On-Shoulder (BOS) operations are an extremely effective method for increasing the quality of a bus service; allowing for a bus to use a freeway shoulder as a bypass lane not only decreases bus travel time but also increases the bus service's overall performance. BOS has also been found to increase bus ridership. The modern BOS system began in the Minneapolis-Saint Paul area almost 20 years ago. Using the extensive data available from Minneapolis-Saint Paul, ridership changes due to BOS operations were explored. The data showed that with 90% confidence, ridership will increase by at least 4.5% and as much as 14.3%. This paper also explores how the citizens of Austin, Texas would respond to a BOS operation on local freeways. A stated preference survey was administered to a sample of Austin commuters. It was determined that potential riders would desire a time savings of 7 or more minutes. Typically it is challenging for persons to accurately predict time savings, therefore it was concluded that for a BOS operation to be successful it was necessary for a there to be a perceived time savings."
Date: August 2010
Creator: Machemehl, Randy B. & Pappas, Elani
Item Type: Report
Partner: UNT Libraries Government Documents Department

Use of Micro Unmanned Aerial Vehicles for roadside condition assessment

Description: "Micro Unmanned Aerial Vehicles (MUAVs) that are equipped with digital imaging systems and global positioning systems provide a potential opportunity for improving the effectiveness and safety of roadside condition and inventory surveys. This study provides an assessment of the effectiveness of MUAVs as a tool for collecting condition data for roadside infrastructure assets using three field experiments."
Date: December 2010
Creator: Gharaibeh, Nasir G. & Hart, William Scott
Item Type: Report
Partner: UNT Libraries Government Documents Department

Designing Fine Aggregate Mixtures to evaluate fatigue crack growth in asphalt mixtures

Description: "Fatigue cracking is a significant form of pavement distress in flexible pavements. The properties of the sand-asphalt mortars or fine aggregate matrix (FAM) can be used to characterize the evolution of fatigue crack growth and self-healing in asphalt mixtures. This study compares the internal microstructure of the mortar within a full asphalt mixture to the internal microstructure of the FAM specimen. This study also conducts a limited evaluation of the influence of mixture properties and methods of compaction on the engineering properties of the FAM specimens. The results from this study, although limited in number, indicate that in most cases the SGC compacted FAM specimen had a microstructure that most closely resembled the microstructure of the mortar within a full asphalt mixture. Another finding from this study was that, at a given level of damage, the healing characteristic of the three different types of FAM mixes was not significantly different. This indicates that the healing rate is mostly dictated by the type of binder and not significantly influenced by the gradation or binder content, as long as the volumetric distribution of the mastic was the same. In other words, the inherent healing characteristics of the asphalt binder play a more significant role relative to other properties (e.g. volumetrics) in the overall fatigue cracking resistance of the asphalt mixture."
Date: April 2001
Creator: Bhasin, Amit; Motamed, Arash & Izadi, Anoosha
Item Type: Report
Partner: UNT Libraries Government Documents Department

How fast is a fast train? : comparing attitudes and preferences for improved passenger rail service among urban areas in the South Central high-speed rail corridor

Description: "Using data from an Internet-based survey of residents in three communities in Central Texas-Waco, Temple, and Hillsboro-this research project examined the potential impacts of new intercity passenger rail service on small-or medium-sized communities located in the intermediate area between two larger urban areas that form the endpoints of a federally designated intercity high-speed rail corridor."
Date: December 2011
Creator: Morgan, Curtis Alan & Sperry, Benjamin R.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Developing infrastructure for interconnecting transportation network and electric grid

Description: "This report is primarily focused on the development of mathematical models that can be used to support decisions regarding a charging station location and installation problem. The major parts of developing the models included identification of the problem, development of mathematical models in the form of bi-level and stochastic programming problems, and development of a solution approach using a meta-heuristic method."
Date: September 2011
Creator: Damnjanovic, Ivan & Kim, Seok
Item Type: Report
Partner: UNT Libraries Government Documents Department

Managing commodity risks in highway contracts: quantifying premiums, accounting for correlations among risk factors, and designing optimal price-adjustment contracts

Description: "The main goal of this report is to investigate the impact of commodity price risk on construction cost and the optimal risk hedging of such risks using price adjustment clauses. More specifically, the objective of the report is to develop models that can help highway agencies manage commodity price risks. In this report, weighted least square regression model is used to estimate the risk premium; both univariate and vector time series models are estimated and applied to simulate changes in commodity prices over time, including the effect of correlation; while genetic algorithm is used as a solution approach to a multi-objective optimization formulation. The data set used in this report consists of TxDot bidding data, market-based data including New York Mercantile Exchange (NYMEX) future options data, and Engineering New-Record (ENR) material cost index data. The results of this report suggest that the optimal risk mitigation actions are conditional on owners' risk preferences, correlation among the prices of commodities, and volatility of the market."
Date: September 2011
Creator: Damnjanovic, Ivan & Zhou, Xue
Item Type: Report
Partner: UNT Libraries Government Documents Department

Optimal infrastructure maintenance scheduling problem under budget uncertainty

Description: "This research addresses a general class of infrastructure asset management problems. Infrastructure agencies usually face budget uncertainties that will eventually lead to suboptimal planning if maintenance decisions are made without taking the uncertainty into consideration. It is important for decision makers to adopt maintenance scheduling policies that take future budget uncertainty into consideration. The author proposes a multistage, stochastic linear programming model to address this problem. The author also develops solution procedures using the augmented Lagrangian decomposition algorithm and scenario reduction method. A case study exploring the computational characteristics of the proposed methods is conducted and the benefit of using the stochastic programming approach is discussed."
Date: May 2011
Creator: Zhang, Zhanmin & Gao, Lu
Item Type: Report
Partner: UNT Libraries Government Documents Department

Development of reliable pavement models

Description: "The current report proposes a framework for estimating the reliability of a given pavement structure as analyzed by the Mechanistic-Empirical Pavement Design Guide (MEPDG). The methodology proposes using a previously fit response surface, in place of the time-demanding implicit limit state functions used within the MEPDG, in combination with an analytical approach to estimating reliability using First-Order and Second-Order Reliability Methods (FORM and SORM). Additionally, in order to assess the accuracy of the FORM and SORM reliability estimates, Monte Carlo simulations are also performed."
Date: May 2011
Creator: Prozzi, Jorge Alberto & Aguiar-Moya, José Pablo
Item Type: Report
Partner: UNT Libraries Government Documents Department

U.S. and Texas international trade and transportation

Description: "This report examines various aspects of international trade, transportation, and foreign practices implemented to facilitate and fund transport-related infrastructure. The report is composed of six chapters. The first chapter provides an overview of the U.S. international trade outlook. The second chapter describes the roles played by air cargo transport, ports and ocean carriers, railroads, and the motor carrier industry in U.S. international trade. The third and fourth chapters focus on Texas-specific international trade and modal gateways. The fifth chapter reviews various transport funding mechanisms, Intelligent Transportation System (ITS) applications, and forms of public-private partnerships adopted in various foreign countries. The final chapter describes the expansion of the Panama Canal and its likely Texas impacts."
Date: July 2011
Creator: Anazia, Larry K. & Boske, Leigh B.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Impacts of pending federal greenhouse gas legislation on the Texas transportation sector

Description: "This 2010 study, funded by the Southwest Region University Transportation Center, assesses current regulatory attempts to mitigate climate change and how such proposed action would impact the Texas transportation sector economically. Social and political trends suggest the United States may soon join other United Nations Framework Convention on Climate Change (UNFCCC) countries in drafting substantive, national climate change policy. After providing a brief overview of past and present climate efforts taken both nationally and internationally, this paper explores different economic solutions to address the externalities of fossil fuel emissions. Alternatives include command-and-control regulation, a carbon tax, and a cap-and-trade program. Several factors, including the difficulty of quantifying and constraining greenhouse gas emissions downstream at the vehicle tailpipe, suggest a carbon tax levied upon upstream refiners is the most promising market-based alternative to reduce carbon emissions within the United States's transportation sector. Texas business leaders and lawmakers have repeatedly voiced their disapproval of mandatory national carbon controls over the past decade. A crucial factor why much of the Lone Star State's populace remains opposed to climate change action is Texas leads the nation's energy industry, which is decidedly fossil-fuel based and therefore carbon intensive. Prevailing thought is a carbon tax would only elevate fuel prices increasing the cost of residential and commercial activity heavily dependent on motor vehicles. This paper articulates how greenhouse gas legislation may financially impact transportation within the Lone Star State and concludes with ways energy and environmental policymakers can build consensus within Texas to address the carbon externality."
Date: May 2010
Creator: Woodward, James T. & Boske, Leigh B.
Item Type: Report
Partner: UNT Libraries Government Documents Department

International air cargo operations and gateways: their emerging importance to the state of Texas

Description: "This report examines the potential of Texas-based airports, especially Dallas-Ft. Worth International Airport and the Houston Airport System, to emerge as international gateways for global trade in general and trans-Pacific trade in particular. The period covered is 2001 to 2006."
Date: July 2011
Creator: Cho, Hee Deok & Boske, Leigh B.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Automated generation of virtual scenarios in driving simulator from highway design data

Description: "The current project explored ways to create custom roadway segments for use in the TTI driving simulator. The project initially attempted to use AutoCAD Civil 3D roadway drawings and export them for use in the simulator."
Date: September 2010
Creator: Zhao, Xi; Nelson, Alicia A.; Chrysler, Susan & Zhang, Yunlong
Item Type: Report
Partner: UNT Libraries Government Documents Department

Partnering with AVID to create transportation scholars

Description: "The goal of this project was to team with the Advancement Via Individual Determination (AVID) program in local schools to stimulate student awareness of transportation and engineering careers and to encourage interest in the science, technology, engineering, and mathematics (STEM) fields."
Date: October 2010
Creator: Jasek, Debbie & Finley, Melisa D.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Network methods for project selection based on optimizing environmental impact

Description: "Traditionally, transportation road networks have been designed for minimal congestion. Unfortunately, such approaches do not guarantee minimal vehicle emissions. Given the negative impacts of vehicle pollutants as well as tighter national air quality standards, it is critical for regions to be able to identify capacity modifications to road networks such that vehicle emission are minimal. This ability combined with land use changes and opportunities for non-auto travel are paramount in helping regions improve air quality."
Date: August 2010
Creator: Duthie, Jennifer Clare; Waller, S. Travis & Ferguson, Erin M.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Performance analysis of the "zoning" strategies for Americans with Disabilities Act paratransit services

Description: "The objective of this research is to provide a more in-depth evaluation and comparison between centralized and decentralized zoning strategies for the city of Houston, Texas, by developing a simulation model to evaluate the effect of zoning strategies on the productivity and service quality for the ADA paratransit service."
Date: August 2010
Creator: Shen, Chung-Wei & Quadrifoglio, Luca
Item Type: Report
Partner: UNT Libraries Government Documents Department

Equity evaluation of vehicle miles traveled fees in Texas

Description: "This report used 2009 National Household Travel Survey (NHTS) Texas data to consider the equity impacts surrounding four vehicle miles traveled (VMT) scenarios. Results indicate that all of the VMT fee scenarios are essentially as equally vertically equitable as the current state gas tax system."
Date: March 2012
Creator: Burris, Mark; Larsen, Lisa. & Whitty, James M.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Idle reduction programs and potential benefits to schools

Description: "This project will measure the cost benefits of implementing a school bus idle reduction program as means to offset the cost of increased bus service."
Date: November 2010
Creator: Hoelscher, Michelle
Item Type: Report
Partner: UNT Libraries Government Documents Department

Robust pricing of transportation networks under uncertainty

Description: "This project will develop these models, which will be suitable either to determine the best pricing policies to maximize revenue or minimize congestion, or to evaluate alternative toll policies according to these metrics."
Date: September 2010
Creator: Gardner, Lauren Marie; Waller, S. Travis & Boyles, Stephen D.
Item Type: Report
Partner: UNT Libraries Government Documents Department

On jointly analyzing the physical activity participation levels of individuals in a family unit using a multivariate copula framework

Description: "The report focuses on analyzing and modeling the physical activity participation levels ( in terms of the number of daily "bouts" or "episodes" of physical activity during a weekend day) of all members of a family jointly."
Date: September 2010
Creator: Eluru, Naveen; Bhat, Chandra R. & Sener, Ipek N.
Item Type: Report
Partner: UNT Libraries Government Documents Department