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  Partner: UNT Libraries Government Documents Department
 Serial/Series Title: Technical report (Texas Transportation Institute)
Development of a MASH TL-2 guardrail-to-bridge rail transition compatible with 31-inch guardrail

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

Date: December 2011
Creator: Bligh, Roger P.; Arrington, Dusty R. & Menges, Wanda L.
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 ...
Contributing Partner: UNT Libraries Government Documents Department
Development of a MASH TL-3 median barrier gate

Development of a MASH TL-3 median barrier gate

Date: February 2011
Creator: Bligh, Roger P.; Arrington, Dusty R.; Sheikh, Nauman Mansoor; Silvestri, Chiara & Menges, Wanda L.
Description: Report regarding a median barrier gate designed to both offer protection to motorists and easier cross-median access for emergency and maintenance vehicles.
Contributing Partner: UNT Libraries Government Documents Department
Development of a model performance-based sign sheeting specification based on the evaluation of nighttime traffic signs using legibility and eye-tracker data

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

Date: September 2010
Creator: Carlson, Paul J.; Miles, Jeffrey D.; Park, Eun Sug; Young, Sarah; Chrysler, Susan & Clark, Jerremy
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."
Contributing Partner: UNT Libraries Government Documents Department
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

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

Date: September 2009
Creator: Carlson, Paul J.; Park, Eun Sug & Miles, Jeffrey D.
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."
Contributing Partner: UNT Libraries Government Documents Department
Development of a precast bridge deck overhang system

Development of a precast bridge deck overhang system

Date: February 2011
Creator: Trejo, David; Head, Monique H.; Mander, John; Mander, Thomas J.; Henley, Mathew; Scott, Reece et al.
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.
Contributing Partner: UNT Libraries Government Documents Department
Development of field performance evaluation tools and program for pavement marking materials: technical report

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

Date: March 2011
Creator: Zhang, Yunlong; Ge, Hancheng; Pike, Adam & Carlson, Paul J.
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.
Contributing Partner: UNT Libraries Government Documents Department
Development of guidelines for pedestrian safety treatments at signalized intersections

Development of guidelines for pedestrian safety treatments at signalized intersections

Date: August 2011
Creator: Pratt, Michael P.; Songchitruksa, Praprut & Bonneson, James A.
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."
Contributing Partner: UNT Libraries Government Documents Department
Development of guidelines for triple left and dual right-turn lanes :  technical report

Development of guidelines for triple left and dual right-turn lanes : technical report

Date: July 2011
Creator: Cooner, Scott A.; Ranft, Stephen E.; Rathod, Yatin K.; Qi, Yi; Yu, Lei; Wang, Yubian et al.
Description: Report regarding the development of geometric and signal design guidelines for triple left-turn lanes and dual right-turn lanes and then evaluatues the safety of such sites in Texas.
Contributing Partner: UNT Libraries Government Documents Department
Development of performance-based evaluation methods and specifications for roadside maintenance

Development of performance-based evaluation methods and specifications for roadside maintenance

Date: October 2010
Creator: Gharaibeh, Nasir G.; Shelton, Debora; Ahmed, Jubair; Chowdhury, Arif & Krugler, Paul E.
Description: " This report documents the work performed during Project 0-6387, "Performance Based Roadside Maintenance Specifications." "
Contributing Partner: UNT Libraries Government Documents Department
Development of precast bridge deck overhang system: technical report

Development of precast bridge deck overhang system: technical report

Date: February 2010
Creator: Kim, Young Hoon & Trejo, David
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."
Contributing Partner: UNT Libraries Government Documents Department
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