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Traffic signal operations handbook workshop series : final report

Description: This report documents the development and conduct of a two-year series of workshops to share information with Texas Department of Transportation (TxDOT) engineers and technicians regarding the cost-effective design and operation of traffic signals at intersections along state highways in Texas. The workshop was one day in length and was offered at six venues in Texas. Workshop topics include basic signal controller timing, coordination timing, signal phasing, rail preemption, detection design, and diamond interchange timing. The workshop participants applied guidelines from the Traffic Signal Operations Handbook in several examples using a spreadsheet program called the Texas Signal Coordination Optimizer (TSCO).
Date: September 2011
Creator: Pratt, Michael P. & Bonneson, James A.
Item Type: Report

Treatments to reduce the frequency of freeway exit sign hits

Description: "Exit gore signs present a significant maintenance challenge for TxDOT. There is concern regarding the safety of personnel working in gore areas to replace these signs, and the resources necessary for continual maintenance. The objective of this project was to identify and evaluate alternative methods that may reduce the number of sign hits. Researchers visited several sites with safety problems related to frequent sign hits, determined factors that contribute to sign crashes, and recommended potential treatments. They also evaluated the impact of eliminating exit gore signs at locations where appropriate advance warning with overhead exit signs are provided. Field studies were conducted at two freeway exits in Corpus Christi, Texas. It was found that the lack of exit gore signs at the two freeway exits did not have any negative consequences in terms of vehicle speeds, deceleration behavior, and erratic maneuvers."
Date: January 2011
Creator: Pesti, Geza; Oben-Boampong, Kwaku; Songchitruksa, Praprut & Theiss, LuAnn
Item Type: Report

TxDOT uses of real-time commercial traffic data : opportunity matrix

Description: Based on a TxDOT survey, a review of other state DOTs, and researcher understanding of Intelligent Transportation System (ITS) needs, the Texas Transportation Institute (TTI) team developed a comprehensive list of opportunities for TxDOT to consider pertaining to future use of private sector (PS) data. Specific opportunities for applying private data were reviewed in light of accuracy of the data, coverage areas, data availability, cost, and control of the data stream.
Date: January 2012
Creator: Middleton, Dan; Brydia, Robert; Kraus, Edgar; Cheu, Kelvin; Rajbhandari, Rajat, 1973-; Songchitruksa, Praprut et al.
Item Type: Report

Unknown foundation determination for scour

Description: This reports objective was to develop a global approach that would reduce the level of uncertainty associated with unknown foundations.
Date: April 2012
Creator: Briaud, J.-L.; Medina-Cetina, Zenon; Hurlebaus, Stefan; Everett, Mark; Tucker, Stacey; Yousefpour, Negin et al.
Item Type: Report

Use of Intelligent Transportation Systems in rural work zones

Description: "This project defined an approach to integrating data collected and traveler information displayed in a work zone with a regional transportation management center and/or other state websites. The project conducted a literature review to define the state of the practice in work zone Intelligent Transportation Systems (ITS; smart work zones) and worked with the Texas Department of Transportation traffic managers to identify their safety and nobility needs in a work zone and where ITS can play a role."
Date: September 2011
Creator: Middleton, Daniel R.; Brydia, Robert; Pesti, Geza; Songchitruksa, Praprut; Balke, Kevin N. & Ullman, Gerald
Item Type: Report

White paper : state of ITS industry and assessment of project types

Description: "This report describes the state of the intelligent transportation system (ITS) industry and provides a reference for use in soliciting ITS strategic plan inputs from stakeholders in Texas."
Date: November 2011
Creator: Seymour, Edward J. (Edward James), 1951-; Chaudhary, Nadeem; Middleton, Dan; Brydia, Robert & Miller, Kristine
Item Type: Report

Work zone positive protection guidelines

Description: "In this report the goal of the project was to develop implementation guidance that the Texas Department of Transportation (TxDOT) can use to make better decisions regarding when and where to use positive protection in work zones and when to consider exposure control and other traffic control measures that could improve work zone safety."
Date: May 2011
Creator: Ullman, Gerald L.; Iragavarapu, Vichika & Sun, Dahzi
Item Type: Report