UNT Libraries Government Documents Department - 87 Matching Results

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Development of a MASH TL-2 guardrail-to-bridge rail transition compatible with 31-inch guardrail

Description: The TxDOT Design Division is in the process of developing new guardrail standards that comply with the AASHTO Manual for Assessing Safety Hardware (MASH). The new guardrail system will provide increased capacity and improved impact performance relative to the current design. A key feature of the new system is an increased in rail mounting height from 27 inches to 31 inches. TxDOT's current TL-2 metal beam transition is 27 inches tall and is not compatible with the new 31 inch guardrail system. While the high-speed, nested thrie beam transition system meets MASH guidelines and is compatible with a 31-inch guardrail, it would be cost-prohibitive to use it on all roadways. The objective of this research was to develop a transition that is suitable for use on lower speed roadways, less expensive and complex than the current high-speed (i.e., TL-3) transition design, and is compatible with a 31-inch guardrail. A low-cost guardrail-to-bridge rail transition was successfully developed and tested under MASH Test Level 2 conditions. It is compatible with a 31-inch guardrail and can connect to rigid concrete bridge rails. It is considered suitable for implementation on roadways that have traffic conditions appropriate for the use of TL-2 safety hardware. Use of this system provides significant savings in material and installation cost compared to the high speed transition system.
Date: December 2011
Creator: Bligh, Roger P.; Arrington, Dusty R. & Menges, Wanda L.

Development of a model performance-based sign sheeting specification based on the evaluation of nighttime traffic signs using legibility and eye-tracker data

Description: "This report focused on the evaluation of traffic sign sheeting performance in terms of meeting the nighttime driver needs. Using the luminance requirements derived from the study and market-weighted headlamp flux matrices, the researchers developed an approach to sigh sheeting specification that is based on nighttime driver needs."
Date: September 2010
Creator: Carlson, Paul J.; Miles, Jeffrey D.; Park, Eun Sug; Young, Sarah; Chrysler, Susan & Clark, Jerremy

Development of a model performance-based sign sheeting specification based on the evaluation of nighttime traffic signs using legibility and eye-tracker data : data and analysis

Description: "This report presents data and technical analyses for Texas Department of Transportation Project 0-5235. This project focused on the evaluation of traffic sign sheeting performance in terms of meeting the nighttime driver needs. The goal was to develop a nighttime driver needs specification for traffic signs. Full information on the project is presented in Report 0-5235-1 Volume 1."
Date: September 2009
Creator: Carlson, Paul J.; Park, Eun Sug & Miles, Jeffrey D.

Development of a precast bridge deck overhang system

Description: This research investigated the overhang and shear capacity of a precast overhang system for potential use during the construction of bridges with precast overhang panels. The research was performed in three phases: the Phase 1 research including work specifically for the Rock Creek Bridge in Parker County, Texas; the Phase 2 research for general precast overhang panels, and; the Phase 3 research investigating the shear capacity. Grout material characteristics were also assessed for possible use in the haunch; constructability issues were also addressed.
Date: February 2011
Creator: Trejo, David; Head, Monique H.; Mander, John; Mander, Thomas J.; Henley, Mathew; Scott, Reece et al.

Development of field performance evaluation tools and program for pavement marking materials: technical report

Description: The objective of this project is to investigate field evaluation plans and procedures and develop field performance-based evaluation procedures for pavement marking materials (PMMs). Field decks are designed incorporating regular long lines, long line in the travel lane, and transverse lines for accelerated testing, while also considering different installation procedures. Three different test field deck sites are selected across the state considering area climate, roadway surface type, and traffic condition. Carefully selected PMM products are installed and monitored for their field performance over time. The relationships between transverse and longitudinal test decks are evaluated with correlation analysis. A tracking database is developed and can record and interactively query all relevant data, track individual jobs and products, and graphically display performance changes over time.
Date: March 2011
Creator: Zhang, Yunlong; Ge, Hancheng; Pike, Adam & Carlson, Paul J.

Development of guidelines for pedestrian safety treatments at signalized intersections

Description: "This document summarized the research conducted and the conclusions reached during the development of guidelines for pedestrian safety treatments at signalized intersections. The guidelines are focused on treatments that alleviate conflicts between left-turning vehicles and pedestrians."
Date: August 2011
Creator: Pratt, Michael P.; Songchitruksa, Praprut & Bonneson, James A.

Development of precast bridge deck overhang system: technical report

Description: "The testing and analyses documented in this report (0-6100-3) provides a new equation for determining the number of shear pockets required for the various shear connector/coupler systems evaluated in this research. This equation was used to determine the number of shear pockets required for the newer TxDOT girders."
Date: February 2010
Creator: Kim, Young Hoon & Trejo, David

Development of Texas Transportation Institute's asphalt compaction monitoring system

Description: "In recent years, the Texas Department of Transportation has made significant progress with the development and implementation of new technologies to measure the uniformity of new hot mix asphalt layer construction. In Project 0-6992, researchers took this check one step further by developing an accurate global positioning system tracking system for compaction rolling so that the compaction effort applied can be monitored for 100 percent of the new surface. This report presents details of the hardware and software developed in this study. The system was field tested on a number of new overlay projects in Texas."
Date: July 2012
Creator: Liu, Wenting; Scullion, Thomas & Kassem, Emad

Development of the Transportation Revenue Estimator and Needs Determination System (TRENDS) forecasting model: MPO sub-models and maintenance

Description: "This report summarizes the technical work performed developing and incorporating Metropolitan Planning Organization sub-models into the existing Texas Revenue Estimator and Needs Determination System (TRENDS) model. Additionally, this report explains the maintenance and monthly updates performed on the TRENDS model."
Date: September 2011
Creator: Glover, Brianne; Norboge, Nicolas. & Ellis, David

Energy developments and the transportation infrastructure in Texas

Description: "This report describes the work completed to measure the impact of increased level of energy-related activities on the Texas Department of Transportation (TxDOT) right-of-way and infrastructure, as well as develop recommendations to reduce and manage TxDOT's exposure and risk resulting from those activities."
Date: March 2012
Creator: Quiroga, CeĢsar A.; Fernando, E. G. & Oh, Jeongho

Estimated impacts of the 2010 census on the Texas transit funding formula

Description: Changes in the population and land area of urbanized areas in Texas will play a significant role in determining the allocation of public transportation funds to service providers in Texas after Census 2010. The purpose of this research report is to review the impacts of the changes in urbanized area population and non-urbanized (rural) population and land area for 2010 on the current Texas Transit Funding Formula for allocation of Federal Section 5311 and state rural and urban funds. This collaborative effort between the Texas Transportation Institute and the Institute for Demographic and Socioeconomic Research at the University of Texas at San Antonio draws upon the complementary expertise of public Transportation planners, demographers, and geographic information systems professionals of the two research organizations. The research project identifies areas with the potential to exceed 200,000 in population and those non-urbanized areas that have potential to become urbanized (over 50,000 people) in 2010. The implications of these changes will be examined relative to the current public transportation funding allocations. The research staff provides a comprehensive assessment of these changes for the state as a whole and for individual transit service providers.
Date: September 2010
Creator: Eschbach, Karl; Cline, Michael; Cherrington, Linda Kay; Edrington, Suzie; Ellis, Patricia & Kraus, Edgar

Evaluating the impact of overweight load routing on buried utility facilities

Description: "The objectives of this project were to (a) provide a review of technical design and engineering requirements for utility accommodation in Texas, (b) provide an assessment of potential impact of overweight loads on buried utilities, (c) provide recommendations for a business process for TxDOT overweight routing coordination, (d) provide recommendations for changes to TxDOT manuals, (e) provide an assessment of UAR adequacy to deal with overweight loads on buried utilities, and (f) provide recommendations for changes to the UAR."
Date: October 2011
Creator: Kraus, Edgar; Oh, Jeong Ho; Fernando, Emmanuel; Li, Eric Yingfeng; Quiroga, Cesar & Koncz, Nicholas

Evaluating the impact of overweight load routing on buried utility facilities

Description: This report focuses on the year one project objectives, which were (a) provide a review of technical design and engineering requirements for utility accommodation in Texas, (b) provide a preliminary assessment of potential impact of overweight loads on buried utilities, (c) provide a preliminary assessment of Utility Accommodation Rules (UAR) adequacy to deal with overweight loads on buried utilities, (d) provide preliminary recommendations for a business process for Texas Department of Transportation overweight routing coordination, and (e) provide recommendations for the phase 2 utility damage evaluation.
Date: February 2011
Creator: Kraus, Edgar; Fernando, Emmanuel; Li, Eric Yingfeng; Oh, Jeong Ho; Koncz, Nicholas & Quiroga, Cesar

Evaluation of traffic control devices : year 3

Description: This project was established to provide a means of conducting small-scale research activities on an as-needed basis so that the results could be available within months of starting the specific research. This report summarizes the research activities that were conducted between September 2010 and August 2011. There were five primary activities and five secondary activities. The five primary activities were evaluating nighttime visibility along rural highways with bright signs, continuing the evaluation of lead-free thermoplastic pavement markings, evaluating contrast pavement marking layouts, continuing the evaluation of accelerated pavement marking test decks, and providing district support for hurricane evacuation routing. In addition, the researchers also started to evaluated criteria for setting 80 mph and 85 mph speed limits, evaluated bridge clearance signing, narrowed the focus of a rotational sign sheeting study, provided technical support for the Texas Manual on Uniform Traffic Control Devices (MUTCD), and provided technical support for the Texas Department of Transportation (TxDOT) sign sheeting specification.
Date: March 2012
Creator: Carlson, Paul J.; Pike, Adam M.; Miles, Jeff D.; Ullman, Brooke R. & Borchardt, Darrel W.

Exploratory study : vehicle mileage fees in Texas

Description: This project evaluates Vehicle Mileage (VM) fees as a possible funding mechanism for meeting the State of Texas' long-term transportation needs. Researchers conducted listening sessions with the general public and stakeholders to gather input on the concept. Researchers also prepared a decision matrix that can aid policy makers in evaluating the various trade-offs in policy that will be encountered in vehicle mileage fee system development. This study identified both challenges and opportunities for implementation of VM fees.
Date: January 2011
Creator: Baker, Richard & Goodin, Ginger

Field and laboratory investigations for Full Depth Reclamation projects

Description: Full-depth reclamation (FDR) offers a timely, cost-effective solution to restore a pavement's condition. However, FDR represents only one technique in the engineer's toolkit available for addressing deteriorating pavement conditions. The purpose of this project is to provide guidance on determining whether a pavement is a candidate for FDR and, if so, what design, construction, and inspection processes will maximize the performance of the completed reclamation. This report presents initial recommendations for selecting a candidate FDR project and developing design options (including field sampling and lab design protocols). Along with a literature review, these recommendations are illustrated by application on several projects in the Texas Department of Transportation's Austin and Dallas Districts.
Date: March 2011
Creator: Sebesta, Stephen; Scullion, Thomas & Estakhri, Cindy K.

Field Evaluation of Asphalt Mixture Skid Resistance and Its Relationship to Aggregate Characteristics

Description: This report documents the findings from the research that was carried out as part of Phase II of TxDOT Project 0-5627. The research included measurements and analysis of mechanical and physical properties of aggregates used in surface mixes in the state of Texas. These properties were aggregate shape characteristics measured using the Aggregate Imaging System (AIMS), British Pendulum value, coarse aggregate acid insolubility, Los Angeles weight loss, Micro-Deval weight loss, and Magnesium sulfate weight loss. In addition, a database of field skid number measurements that were collected over a number of years using the skid trailer was developed. The Dynamic Friction Tester (DFT) and Circular Texture Meter (CTMeter) were used to measure friction and texture, respectively, of selected asphalt pavement sections. These data and measurements were used to carry out comprehensive statistical analyses of the influence of aggregate properties and mixture design on skid resistance value and its variability. Consequently, a method and software were developed for predicting asphalt pavement skid resistance. This method requires inputs that describe aggregate resistance to polishing, mixture gradation, and traffic. The developed software can be used to select the mixture type and aggregate source that are needed to achieve the required level of skid resistance for a given service life.
Date: December 2010
Creator: Masad, Eyad; Rezaei, Arash; Chowdhury, Arif & Freeman, Thomas J.