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Texas Transportation Institute

Works: 4,693 works in 7,657 publications in 1 language and 46,739 library holdings
Genres: Periodicals 
Roles: Other
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Most widely held works about Texas Transportation Institute
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Most widely held works by Texas Transportation Institute
Traffic congestion and reliability : linking solutions to problems( )

5 editions published in 2004 in English and held by 269 WorldCat member libraries worldwide

Traffic congestion and reliability : trends and advanced strategies for congestion mitigation( )

7 editions published in 2005 in English and held by 267 WorldCat member libraries worldwide

Traffic incident management resource management by Jodi L Carson( )

2 editions published in 2009 in English and held by 265 WorldCat member libraries worldwide

Parent-taught driver education in Texas : a comparative evaluation by Val Pezoldt( )

2 editions published in 2007 in English and held by 259 WorldCat member libraries worldwide

An evaluation of the Parent-Taught Driver Education (PTDE) program in Texas was conducted using three different research techniques: (1) focus groups with driver education instructors, teen drivers, and their parents; (2) a statewide mail survey of young drivers; and (3) an analysis of Texas driver records
Performance measures and targets for transportation asset management by Cambridge Systematics( )

4 editions published in 2006 in English and held by 250 WorldCat member libraries worldwide

"TRB's National Cooperative Highway Research Program (NCHRP) Report 551: Performance Measures and Targets for Transportation Asset Management describes the research effort associated with production of the report and provides the current state of practice on the use of performance measures, principally in the context of transportation asset management. In addition, the report introduces a framework for identifying performance measures and setting target values. The report appendixes contain examples of performance measures and targets. The report is designed to help transportation agencies apply the concepts of performance management to their asset management efforts"--Publisher's description
Traffic monitoring in recreational areas by Shawn Turner( )

2 editions published in 2010 in English and held by 248 WorldCat member libraries worldwide

Modeling of hot-mix asphalt compaction : a thermodynamics-based compressible viscoelastic model( )

2 editions published in 2010 in English and held by 248 WorldCat member libraries worldwide

Compaction is the process of reducing the volume of hot-mix asphalt (HMA) by the application of external forces. As a result of compaction, the volume of air voids decreases, aggregate interlock increases, and interparticle friction increases. The quality of field compaction of HMA is one of the most important elements influencing asphalt pavement performance. Poor compaction has been associated with asphalt bleeding in hot weather, moisture damage, excessive aging and associated cracking, and premature permanent deformation. This study was conducted to develop a model within the context of a thermomechanical framework for the compaction of asphalt mixtures. The asphalt mixture was modeled as a nonlinear compressible material exhibiting time-dependent properties. A numerical scheme based on finite elements was employed to solve the equations governing compaction mechanisms. The material model was implemented in the Computer Aided Pavement Analysis (CAPA-3D) finite-element (FE) package. Due to the difficulty of conducting tests on the mixture at the compaction temperature, a procedure was developed to determine the model's parameters from the analysis of the Superpave® gyratory compaction curves. A number of mixtures were compacted in the Superpave® gyratory compactor using an angle of 1.25 degrees in order to determine the model's parameters. Consequently, the model was used to predict the compaction curves of mixtures compacted using a 2-degree angle of gyration. The model compared reasonably well with the compaction curves. FE simulations of the compaction of several pavement sections were conducted in this study. The results demonstrated the potential of the material model to represent asphalt mixture field compaction. The developed model is a useful tool for simulating the compaction of asphalt mixtures under laboratory and field conditions. In addition, it can be used to determine the influence of various material properties and mixture designs on the model's parameters and mixture compactability
Traffic monitoring : a guidebook by Shawn Turner( )

2 editions published between 1980 and 2010 in English and held by 245 WorldCat member libraries worldwide

Minimum retroreflectivity levels for blue and brown traffic signs by Andrew J Holick( )

3 editions published in 2008 in English and held by 241 WorldCat member libraries worldwide

In 2003, the Federal Highway Administration published research recommendations for minimum maintained retroreflectivity (MR) levels for traffic signs. The recommendations included most sign types but not white-on-blue signs or white-on-brown signs. In addition, the 2003 recommended maintained retroreflectivity levels were based on conditions representing dark rural environments. This report describes the research activities and consequent findings related to the development of recommendations for MR levels for white-on-blue signs and white-on-brown signs. This report also includes an investigation related to MR levels needed for complex visual conditions that include glare from oncoming headlamps and fixed roadway lighting. The research used a summary of the pertinent literature to develop an experimental plan to produce luminance thresholds that could be used with a previously developed analytical model to develop a set of recommendations for MR levels for white-on-blue signs and white-on-brown signs. The results for the white-on-blue signs and the white-on-brown signs were integrated into one table that includes the current set of MR levels. Both legend and symbol signs were consolidated into the same recommendations because of similar requirements for luminance thresholds
TMIP connection : the Travel Model Improvement Program newsletter by Travel Model Improvement Program (U.S.)( )

in English and held by 238 WorldCat member libraries worldwide

Impact of exempt vehicles on managed lanes by Katherine F Turnbull( )

3 editions published in 2014 in English and held by 234 WorldCat member libraries worldwide

In order to better utilize available capacity in high-occupancy vehicle (HOV) lanes, states are permitted to allow certain qualifying non-HOVs to use HOV lanes. In general, states may allow motorcycles, public transportation vehicles, high-occupancy toll (HOT) vehicles, and low-emission and energy-efficient vehicles to use HOV lanes. For any or all of these types of vehicles, the states must establish programs addressing candidacy, enrollment, and management of the lanes. In the case of tolled vehicles, dynamic pricing is the primary control that limits the potential to cause congestion in the lanes. In the case of the energy-efficient vehicles, the programs typically include decals, licenses, license plates, or stickers, that serve to identify and, in some cases, cap the number of allowed to use the lanes vehicles. Concerns may arise that the number of exempted vehicles may overburden the capacity of the HOV lanes to perform their primary function, which is to provide an incentive to form carpools (and thereby reduce the number of cars on the road) and to "reward" such an incentive by guaranteeing a mostly delay-free trip. Use by non-HOVs may overburden the HOV lanes, causing the integrity of the HOV lanes to suffer. The Moving Ahead for Progress in the 21st Century Act (MAP-21) 2012 now mandates that any HOV facility that allows tolled vehicles or any class of qualifying energy-efficient vehicles must annually certify that the subject lanes are "not degraded." By definition, this constitutes that for a 180-day continuous reporting period, the lane(s) operate at greater than 45 mph for 90% of the time. (See Section 166, Title 23 of United States Code for the full language.) This report examines programs in use by states allowing low-emission and energy efficient vehicles to use HOV, HOT, and managed lanes without meeting the vehicle-occupancy requirements. Information is presented on the enabling legislation, the program elements, use of the programs, and impacts of the HOV, HOT, and managed lanes in 13 states
Integrating demand management into the transportation planning process : a desk reference by Deepak Gopalakrishna( )

2 editions published between 2012 and 2013 in English and held by 234 WorldCat member libraries worldwide

This document has been developed to serve as a desk reference on integrating demand management into the transportation planning process. The desk reference is organized around two fundamental aspects of transportation planning - policy objectives and scope of the planning effort. The report discusses how demand management relates to seven key policy objectives that are often included in transportation plans, such as congestion and air quality. It then discusses how demand management might be integrating into four levels of transportation planning from the state down to the local level. The report also includes information on tools available for evaluating demand management measures and on the known effectiveness of these measures
Best practices in traffic incident management by Jodi L Carson( )

1 edition published in 2010 in English and held by 226 WorldCat member libraries worldwide

Models for predicting reflection cracking of hot-mix asphalt overlays( )

3 editions published in 2010 in English and held by 225 WorldCat member libraries worldwide

TRB's National Cooperative Highway Research Program (NCHRP) Report 669: Models for Predicting Reflection Cracking of Hot-Mix Asphalt Overlays explores mechanistic-based models for predicting the extent and severity of reflection cracking in hot-mix asphalt overlays. Appendices A through T to NCHRP Report 669 are available online
Border-wide assessment of intelligent transportation system (ITS) technology : current and future concepts : final report by Rajat Rajbhandari( )

1 edition published in 2012 in English and held by 223 WorldCat member libraries worldwide

Methods for maintaining traffic sign retroreflectivity by Paul J Carlson( )

2 editions published in 2007 in English and held by 222 WorldCat member libraries worldwide

Traffic incident management quick clearance laws : a national review of best practice by Jodi L Carson( )

1 edition published in 2008 in English and held by 221 WorldCat member libraries worldwide

Constituting 'Quick Clearance Laws', three types of general legislation Move Over, Driver Removal, and Authority Removal laws - support concurrent Quick Clearance operations intended to enhance motorist and responder safety, as well as reduce congestion and delay. Although a number of States currently have one or more of these laws in place, observed variability in the existence, wording, and coverage of Quick Clearance Laws challenges further implementation. The intent of this investigation was to better support Quick Clearance Law implementation efforts by better preparing States to respond to questions regarding the necessity of Quick Clearance legislation and identifying examples from existing State Move Over, Driver Removal, and Authority Removal legislation that serve to both support and challenge successful incident management operations. Through this investigation, carefully crafted statutory content and language that best support Quick Clearance objectives, and agency/industry partnerships that provide demonstrated, united support for safe, Quick Clearance objectives and related legislation were observed to be key factors supporting implementation of Quick Clearance Laws. This report includes: (1) a description of the role and relevance of Quick Clearance Laws in the broader traffic incident management context; (2) a detailed review of the purpose and intent, model language, observed content trends and anomalies, and implementation challenges and resolutions for Move Over, Driver Removal, and Authority Removal laws including specific examples from State legislation; and (3) concluding remarks and proposed strategies for implementation, including beneficial synergy resulting from combined Quick Clearance Law implementation
Enhancing internal trip capture estimation for mixed-use developments( )

3 editions published in 2011 in English and held by 220 WorldCat member libraries worldwide

TRB's National Cooperative Highway Research Program (NCHRP) Report 684: Enhancing Internal Trip Capture Estimation for Mixed-Use Developments explores an improved methodology to estimate how many internal trips will be generated in mixed-use developments - trips for which both the origin and destination are within the development. The methodology estimates morning and afternoon peak-period trips to and from six specific land use categories: office, retail, restaurant, residential, cinema, and hotel. The research team analyzed existing data from prior surveys and collected new data at three mixed-use development sites. The resulting methodology is incorporated into a spreadsheet model, which is available online for download
Field evaluation of detection-control system by D. R Middleton( )

1 edition published in 2015 in English and held by 209 WorldCat member libraries worldwide

Simulator study of signs for a complex interchange and complex interchange spreadsheet tool by Kay Fitzpatrick( )

2 editions published in 2013 in English and held by 208 WorldCat member libraries worldwide

This report documents a Federal Highway Administration (FHWA) project to identify potential improvements to current signing practices for complex interchanges. Based on the initial literature review task along with discussions on other ongoing work, FHWA and the research team divided the project into the following two studies: (1) conduct a driving simulator study and (2) develop a metric or tool that can score, rate, or otherwise categorize interchange complexity. In the first study, test signs were introduced as six topics in a simulation along freeway roadways to evaluate drivers' real-time response to the signs. Topic 1 tested the understanding and use of different methods to sign for an option lane. Almost all participants made the correct decision to exit or stay on the freeway; however, many unnecessary lane changes were made with each of the three sign sets (SSs). Topic 2 studied sign methods when two interstate exits were within close proximity and a need existed to sign for three destinations (two interchanges/exits and the through lanes). For the SS that had an arrow-per-lane design, all participants made correct lane change decisions. Topic 3 evaluated signing for an upcoming exit that had a Y-split into two directions. While several incorrect lane changes were made for each SS, the SS that used split exit signs at all three sign bridge (SB) locations had the fewest incorrect lane changes and was judged superior in comparison to the other two arrangements. Topic 4 evaluated whether it was better to fill an advance single sign with supplemental way-finding information or to spread the information among multiple signs. An observation from this topic was that spreading information about the next exit across multiple signs on a single bridge may have unintended consequences if the SB also includes a sign for another exit that is located to the left of the preferred lane. Topic 5 evaluated the effectiveness of sign spreading when there were many pieces of information on one SB. Similar to topic 4, it was determined that the lateral position of a sign on the SB is important. Topic 6 evaluated driver understanding of left exit signs. The difference between the two SSs that were tested was minimal. In study 2, the complexity rating tool focused on geometric design factors and related effects on driver expectancy and driver workload. After several revisions, researchers settled on a spreadsheet tool that considered the effects of 32 weighted factors that were based on site characteristics. To determine how well the spreadsheet tool would evaluate interchanges, the research team used the spreadsheet to review 28 existing sites in 11 States. The sites were submitted by State transportation departments based on their perceived complexity. For the characteristics included in the spreadsheet, the results provided a general sense of the relative complexity of the interchanges studied
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Alternative Names

controlled identityAgricultural and Mechanical College of Texas

controlled identityTexas A & M Transportation Institute

controlled identityTexas A & M University


T.T.I. (Texas Transportation Institute)

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Texas A and M University College Station, Tex Texas Transportation Institute

Texas A and M University College Station, Tex Transportation Institute

Texas A&M University Texas Transportation Institute

Texas A&M University Transportation Institute

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Texas Transportation Institute

Texas Transportation Institute, College Station

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English (73)