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The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations. Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.

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Showing 2341 - 2360 of 35909 results
  • Develop Bridge WeighinMotion Approach to Measure Live Loads on Texas Highways Summary Report
    Develop Bridge Weigh-in-Motion Approach to Measure Live Loads on Texas Highways: Summary Report
    Yarnold, Matthew ;
    Shi, Shengyi
    2022-10-31 | PDF
    This project realized these advantages through the development of a B-WIM system (Figure 1) that included extensive experimental testing followed by field validation on in-service bridges. In addition, the project developed an approach to identify bridge parameters from the B-WIM data, such as distribution factors and composite action, which were u ...
  • Modeling the Dynamic Modulus of Asphalt Mixtures Using SingleValue Test Results Phase I Initial Relation With Cracking Tolerance Index
    Modeling the Dynamic Modulus of Asphalt Mixtures Using Single-Value Test Results, Phase I: Initial Relation With Cracking Tolerance Index
    Romero, Pedro ;
    VanFrank, Kevin
    2022-10-31 | PDF
    This report documents the effort to develop a practical relation between the cracking tolerance index and portions of the dynamic modulus curves of asphalt mixtures. A review of practices used to create asphalt mixtures’ dynamic modulus master curves, based on NCHRP reports and other relevant literature, indicates that the dynamic modulus used as i ...
  • Before Study Evaluation of Interstate 4 I4 Floridas Regional Advanced Mobility Elements FRAME Project Before Analysis
    Before Study Evaluation of Interstate 4 (I-4) Florida’s Regional Advanced Mobility Elements (FRAME) Project (Before Analysis)
    Abdel-Aty, Mohamed A ;
    Islam, Zubayer
    2022-10-27 | PDF
    The primary objectives of this project were to evaluate the safety and mobility conditions along the I-4 corridor from Orlando to Tampa as a part of Interstate 4 (I-4) Florida’s Regional Advanced Mobility Elements’ (FRAME) integrated corridor management (ICM). Since UCF’s main role will be to identify safety challenges on the project corridors and ...
  • Bridge WeighinMotionan Approach to Measure Truck Loading on Texas Highways Workshop
    Bridge Weigh-in-Motion-an Approach to Measure Truck Loading on Texas Highways: Workshop
    Yarnold, Matthew ;
    Mander, John B.
    2022-10-26 | PDF
    A half-day workshop will be performed as part of this project. The purpose is to introduce Bridge Weigh-in-Motion (B-WIM) to the attendees and disseminate the findings of the study. This information can be utilized by TxDOT for possible applications of B-WIM for traffic monitoring or bridge assessment and management. The workshop will be a hybrid f ...
    Supporting Files
  • Public Education about Occupant Protection Technologies and Protecting Occupants with Disabilities
    Public Education about Occupant Protection Technologies and Protecting Occupants with Disabilities
    Jeihani, Mansoureh ;
    Javid, Ramina
    2022-10-25 | PDF
    Occupant protection is the foundation of any traffic safety program. According to National Highway Traffic Safety Administration (NHTSA) estimates, improvements in vehicle safety have helped increase the number of lives saved annually from 115 in 1960 to 27,621 in 2012. Therefore, educating drivers about advanced new technologies in vehicle occupan ...
  • Standards Updates for Single Span Prefabricated Bridges Technology Transfer Technical Brief
    Standards Updates for Single Span Prefabricated Bridges — Technology Transfer Technical Brief
    Rossbach, Phil ;
    Nelson, Al
    2022-10-15 | PDF
    Standards for Single Span Prefabricated Bridges were developed by HDR for the Iowa Department of Transportation in 2016 for the use on the county road system. These standards incorporated single span precast or precast/pretensioned concrete box beams with span lengths ranging from 30-feet to 70-feet, clear roadway widths of 24-feet and 30-feet, and ...
  • Guide to Remediate Bridge Deck Cracking
    Guide to Remediate Bridge Deck Cracking
    ElBatanouny, Mohamed K. ;
    Hawkins, Kathleen A.
    2022-10-11 | PDF
    Bridge decks are known to experience early-age cracking that occurs immediately after or within a few years of construction. Early age bridge deck cracks are undesirable because they increase deck maintenance needs, and thereby increase costs and traffic disruptions as well. To address this issue, Iowa DOT funded this study to develop a comprehensi ...
  • Microsimulation Department Assessment and Guidance
    Microsimulation: Department Assessment and Guidance
    Hadi, Mohammed ;
    Mamun, Md Mahmud Hasan
    2022-10-01 | PDF
    There is an increasing recognition of the need for additional guidance for utilizing simulation tools, considering the increasing complexity of the transportation system, the interactions of several factors in impacting system performance, and the increasing sophistication of strategies, technologies, and applications considered to increase system ...
  • Analyze Business Models for Implementation and Operation of a Statewide GNSS RTN
    Analyze Business Models for Implementation and Operation of a Statewide GNSS RTN
    Al-Kaisy, Ahmed ;
    Teixeira, Rafael
    2022-10-01 | PDF
    The Global Navigation Satellite System (GNSS), commonly known as the global positioning system, has become one of the fastest-growing emerging technologies delivering location services to various sectors. The applications of geospatial data span every sphere of modern-day science and industry where geographical positioning matters. The list include ...
  • Develop Guidelines and Best Practices for Bonding HotMix Asphalt to Portland Cement Concrete Pavement Final Report
    Develop Guidelines and Best Practices for Bonding Hot-Mix Asphalt to Portland Cement Concrete Pavement: Final Report
    Komaragiri, Satyavati ;
    Drimalas, Thanos
    2022-10-01 | PDF
    Proper bonding between different layers of a composite pavement is the major factor in ensuring that the entire structure acts as a monolithic layer under loading. This bonding is provided by a thin layer of tack coat that is applied between the pavement layers. This project studied the bonding between hot mix asphalt (HMA) and concrete layers of a ...
  • Development of Statewide Design Guidelines for Improving Pedestrian Safety on HighSpeed Arterials in Louisiana Research Project Capsule
    Development of Statewide Design Guidelines for Improving Pedestrian Safety on High-Speed Arterials in Louisiana [Research Project Capsule]
    Hassan, Hany ;
    Rupnow, Tyson
    2022-10-01 | PDF
    The alarming increase in pedestrian fatalities across the globe is concerning. According to the National Highway Traffic Safety Administration (NHTSA), 36,096 people were killed in transportation-related crashes in the United States in 2019, of which 6,205 were pedestrians. Louisiana’s pedestrian deaths rose 35.2% from 2015 to 2020. In 2020, Louisi ...
  • Work Zone Speed Limits and Motorist Compliance Tech Transfer Summary
    Work Zone Speed Limits and Motorist Compliance: Tech Transfer Summary
    Savolainen, Peter ;
    Gates, Timothy
    2022-10-01 | PDF
    This study sought to identify best practices for setting work zone speed limits by state departments of transportation (DOTs) and to evaluate select strategies for improving compliance with work zone speed limits. The objectives of this project were achieved by synthesizing information from a literature review, a state DOT survey, and field evaluat ...
  • Evaluating the Accuracy and Use of Drilled Shaft Integrity Testing Methods in Illinois
    Evaluating the Accuracy and Use of Drilled Shaft Integrity Testing Methods in Illinois
    Stark, Timothy D. ;
    Idries, Abedalqader
    2022-10-01 | PDF
    In this project, thermal integrity profile (TIP) and crosshole sonic logging (CSL) tests were performed on three test drilled shafts in three locations in Illinois to determine which technology is more effective at identifying installed defects in drilled shafts. TIP testing was found to be more effective than CSL in identifying installed defects o ...
  • Development of Deterioration Curves for Bridge Elements in Montana
    Development of Deterioration Curves for Bridge Elements in Montana
    Fick, Damon ;
    Bell, Matthew
    2022-10-01 | PDF
    The Federal Highway Administration has established measures for state departments of transportation to develop an asset management plan that includes deterioration forecasting to improve or preserve bridge conditions. The primary objective of this research was to support Montana’s bridge management system by developing state-specific deterioration ...
  • Assessing Traffic Threats for Amphibian and Reptile Species of Greatest Conservation Need on Texas Roadways Final Report
    Assessing Traffic Threats for Amphibian and Reptile Species of Greatest Conservation Need on Texas Roadways: Final Report
    Walkup, Danielle K ;
    Skow, Kevin L
    2022-10-01 | PDF
    Many environmental impacts involve state and federally listed threatened and endangered (TE) species. Wildlife-vehicle collision (WVC) data can improve environmental impact assessments for TE species. Accurate WVC data has been collected for amphibian and reptile species on Texas roadways since 2012, in the form of observations in the “Herps of Tex ...
  • Work Zone Speed Limits and Motorist Compliance
    Work Zone Speed Limits and Motorist Compliance
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2022-10-01 | PDF
    This study sought to identify best practices for setting work zone speed limits by state departments of transportation (DOTs) and to evaluate select strategies for improving compliance with work zone speed limits. This was achieved by synthesizing information from a literature review, a state DOT survey, and field evaluations of select speed manage ...
  • Developing Guidelines for Precoating of Aggregates Used in Seal Coats Report
    Developing Guidelines for Precoating of Aggregates Used in Seal Coats [Report]
    Lopez, Erica ;
    Rung, Michael
    2022-10-01 | PDF
    Seal coats in Texas are unique because most binder is hot applied, and aggregates are precoated. Precoating eliminates dust and improves adhesion between aggregate and binder. There currently exists no guidelines or specifications in place that can allow engineers to specify and accept the quality and extent of binder used to precoat aggregates. Pr ...
  • Synthesis of Automated Pedestrian Data Collection Technologies Report
    Synthesis of Automated Pedestrian Data Collection Technologies [Report]
    Haddad, Angela ;
    Macias, Lisa
    2022-10-01 | PDF
    Through academic research and direct communications with transportation agencies, this project surveys new roadside technologies that can assist in efforts for detecting pedestrians. Reasons for using such technologies include traffic operations enhancements, safety improvements, planning, benchmarking, and eventual connected vehicle integrations. ...
  • Considering Conspicuity for North Carolina Department of Transportation Light Trucks Final Report
    Considering Conspicuity for North Carolina Department of Transportation Light Trucks Final Report
    Sylcott, Brian
    2022-10-01 | PDF
    A 2014 change in vehicle appearance guidelines forwent custom bright yellow paint job in favor of the factory standard white color for NCDOT light duty trucks. This change raised some concerns about vehicle conspicuity, or the vehicle’s ability to draw attention to itself. The addition of high visibility markings was offered as a possible solution. ...
  • Hightension Cable Median Barrier Safety Effectiveness Evaluation
    High-tension Cable Median Barrier Safety Effectiveness Evaluation
    Storm, Richard ;
    Srinivasan, Raghavan
    2022-10-01 | PDF
    The objective of this study was to evaluate the change in crash frequency or severity of varying lateral offset distances of high-tension cable median barriers in Minnesota. Crash and traffic data from 2016 to present were conjoined with roadway cross-sectional data and high-tension cable barrier locations to perform cross-sectional analyses for in ...
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