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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 3061 - 3080 of 36873 results
  • M107 Outdoor Laboratory and Testbed for Bridge Health
    M107: Outdoor Laboratory and Testbed for Bridge Health
    Wood, Richard L. ;
    Nasimi, Mitra
    2022-06-01 | PDF
    Due to the aging problem of bridges and the limited financial resources in the United States, it is necessary to form a deeper understanding of existing, aging bridges in an effort to extend their in-service life. To address this problem, researchers from the University of Nebraska-Lincoln (UNL) and engineers from the Nebraska Department of Transpo ...
  • Safety and Mobility Analysis of Rolling Slowdown for Work Zones Comparison with Full Closure
    Safety and Mobility Analysis of Rolling Slowdown for Work Zones: Comparison with Full Closure
    Nafakh, Abdullah Jalal ;
    Davila, Franklin Vargas
    2022-06-01 | PDF
    There are times when the traffic lanes through a work zone must be kept clear for activities such as placing overhead beams, erecting overhead signs, and installing power lines, and other temporary roadway work activities. As an alternative to a full road closure, a rolling slowdown can typically provide up to 30 minutes to complete such activities ...
  • Updating the Bridge Construction Cost Database
    Updating the Bridge Construction Cost Database
    Catchings, Rachel ;
    Li, Ying
    2022-06-01 | PDF
    Adopting a comprehensive suite of methods to track, analyze, and maintain data on bridge construction costs can help state transportation agencies identify and implement strategies to mitigate the influence of factors which escalate project costs. This report discusses how the Kentucky Transportation Cabinet (KYTC) should approach updating, maintai ...
  • Extended Weight Systems Pavement Analysis
    Extended Weight Systems Pavement Analysis
    Marks, P Gayle ;
    Wilcoxson, Jon
    2022-06-01 | PDF
    Kentucky established its Extended Weight Coal or Coal By-products Haul Road System (EWCHRS) in 1986. This road network includes segments of the Coal Haul Highway System on which more than 50,000 tons coal or coal byproducts were transported by motor vehicles during the previous calendar year. In the past few years, the state has introduced extended ...
  • Pilot Inservice Performance Evaluation of Cable Barrier in Washington State
    Pilot In-service Performance Evaluation of Cable Barrier in Washington State
    Abbott, Paul ;
    Manchas, Brad
    2022-06-01 | PDF
    A pilot routine in-service performance evaluation (ISPE) was undertaken for cable barrier following the process outlined in NCHRP 22-33. Barrier breach, rollover, vehicle mix, and secondary impacts on the roadside and roadway were evaluated as performance measures using data sourced from the Crash Location & Analysis System (CLAS) database and the ...
  • Establishing Fresh Properties of Fiber Reinforced Concrete for Performance Engineered Mixture PEM
    Establishing Fresh Properties of Fiber Reinforced Concrete for Performance Engineered Mixture (PEM)
    Barman, Manik ;
    Kamara, Alieu
    2022-06-01 | PDF
    The addition of macro or structural fibers into concrete enhances its post-cracking performance. The objective of this study was to conduct a laboratory investigation to determine the influence of structural fibers on the fresh concrete test parameters (Super air meter (SAM) number, V-Kelly index, and Box test rating) recommended for the performanc ...
  • Evaluation of the Nevada DOT Rest Area System Recommendations to Reduce Gaps in Traveler Services
    Evaluation of the Nevada DOT Rest Area System: Recommendations to Reduce Gaps in Traveler Services
    Gates, Timothy J. ;
    Kay, Jonathan
    2022-06-01 | PDF
    Research was conducted to inform decisions related to the system of public rest area facilities owned by the Nevada Department of Transportation (NDOT). The initial steps of the research included collection of data related to the NDOT highway network (including road segment information, traffic volumes, and crashes), NDOT rest areas (including rest ...
  • Workzone Lighting and Glare on Nighttime Construction and Maintenance Activities
    Workzone Lighting and Glare on Nighttime Construction and Maintenance Activities
    Nafakh, Abdullah Jalal ;
    Davila, Franklin Vargas
    2022-06-01 | PDF
    Over the last two decades, an increasing number of highway construction and maintenance projects in the United States have been completed at night to avoid or alleviate traffic congestion delays. Working at night entails several advantages, including lower traffic volumes, less impact on local businesses, cooler temperatures for equipment and mater ...
  • Evaluation of Work Zone Safety Using the SHRP2 Naturalistic Driving Study Data Volume 1 Toolbox of Work Zone Countermeasures
    Evaluation of Work Zone Safety Using the SHRP2 Naturalistic Driving Study Data – Volume 1 Toolbox of Work Zone Countermeasures
    Hallmark, Shauna ;
    Basulto-Elias, Guillermo
    2022-06-01 | PDF
    This toolbox is one of the deliverables for the culmination of several phases of a project, which evaluated driver behavior in work zones using the SHRP2 Naturalistic Driving Study (NDS) data. The toolbox summarizes information about work zone traffic control devices, countermeasures, and work zone features that have a demonstrated impact on speed ...
  • Evaluating the Use of Video Cameras to Estimate Bridge Scour Potential at Four Bridges in Southwestern Montana Fact Sheet
    Evaluating the Use of Video Cameras to Estimate Bridge Scour Potential at Four Bridges in Southwestern Montana [Fact Sheet]
    Armstrong, DW ;
    Holnbeck, Stephen R.
    2022-06-01 | PDF
    The U.S. Geological Survey, in cooperation with the Montana Department of Transportation, installed cameras and large-scale particle image velocimetry (LSPIV) recording equipment at four sites where the U.S. Geological Survey and Montana Department of Transportation are monitoring bridge scour using other methods. Determination of stream velocities ...
  • Development of Superpave 5 Asphalt Mix Designs for Minnesota Pavements
    Development of Superpave 5 Asphalt Mix Designs for Minnesota Pavements
    Yan, Tianhao ;
    Marasteanu, Mihai
    2022-06-01 | PDF
    High field density is desired for improving the durability of asphalt pavements. This research aims to develop Superpave 5 mixtures (more compactable than traditional Superpave mixtures) by using locally available materials to improve the field density in Minnesota. First, previous projects in Minnesota were investigated. The mean and standard devi ...
  • Evaluation of Work Zone Safety Using the SHRP2 Naturalistic Driving Study Data Volume 2 Description of Research
    Evaluation of Work Zone Safety Using the SHRP2 Naturalistic Driving Study Data – Volume 2 Description of Research
    Hallmark, Shauna ;
    Basulto-Elias, Guillermo
    2022-06-01 | PDF
    This report is one of the deliverables for the culmination of several phases of a project, which evaluated driver behavior in work zones using the SHRP2 Naturalistic Driving Study (NDS) data. This study utilized SHRP2 NDS to evaluate the impact of traffic control devices in reducing driver speed in work zones. The main advantage to the SHPR 2 NDS d ...
  • Utilization of Laser Induced Breakdown Spectroscopy LIBS for RealTime Testing and Quality Control Monitoring of Aggregate Materials used in Highway Construction Final Report
    Utilization of Laser Induced Breakdown Spectroscopy (LIBS) for Real-Time Testing and Quality Control Monitoring of Aggregate Materials used in Highway Construction [Final Report]
    Chesner, Warren H. ;
    Stein, Chris
    2022-06-01 | PDF
    Laser scanning of transportation aggregate materials provides a means to identify aggregate types, sources, and quality in near real-time. The Transportation Pooled Fund (TPF) effort described in this report began as a sequel to a TRB IDEA Program proof of concept laboratory study in 2012, and culminated in the development of the first commercial l ...
  • Specialized Safety Training for KYTC Construction and Maintenance Personnel
    Specialized Safety Training for KYTC Construction and Maintenance Personnel
    Dadi, Gabriel B. ;
    Ammar, Ashtarout
    2022-06-01 | PDF
    High-quality safety training is critical for educating employees in the highway construction and maintenance industry about workplace hazards and giving them tools to remove and/or minimize associated risks. But researchers and state transportation agencies have not committed enough resources to develop safety trainings that address the unique need ...
  • AgBased Deicing Additives December 2022
    Ag-Based Deicing Additives [December 2022]
    Fay, Laura ;
    Bell, Matthew
    2022-06-01 | PDF
    The objective of this project is to assist Colorado Department of Transportation (CDOT) in the identification of regionally sourced agricultural co- or by-product deicer additives that will enhance corrosion protection and provide added deicing performance and longevity to road surfaces. A literature review provides a summary of agriculturally deri ...
  • Statewide Implementation of Regionally Adapted Native Seeds
    Statewide Implementation of Regionally Adapted Native Seeds
    Pawelek, Keith A ;
    Wayland, Tyler C
    2022-06-01 | PDF
    Mandated by multiple federal executive orders and the Clean Water Act, native seeds must be used, when available, to prevent erosion following construction activities on highway rights-of-ways. Historically, native seeds have resulted in marginal performance across much of the state, and there have been insufficient commercially available native se ...
  • Measuring Explosive Airblast of Remote Avalanche Control Systems RACS
    Measuring Explosive Airblast of Remote Avalanche Control Systems (RACS)
    Larson, Robb ;
    Seitz, Brandt
    2022-06-01 | PDF
    Ski areas and departments of transportation routinely use a variety of explosives-based and gas-based systems to generate overpressures resulting in loads sufficient to initiate snow avalanches. Various investigators including Johnson, Gubler, Miller and Simione, explored phenomenon such as effect of blast height on snowpack response, snowpack acce ...
  • Noninvasive Sensor Deployment in Aurora Member States
    Non-invasive Sensor Deployment in Aurora Member States
    Hans, Zach ;
    Sassani, Alireza
    2022-06-01 | PDF
    This project pursued a large-scale effort to deploy non-invasive sensors adjacent to invasive sensors (embedded in the pavement) located at existing road weather information system (RWIS) stations and to consider agency suitability between the different sensors. While some RWIS stations may have multiple invasive sensors measuring pavement temperat ...
  • Performance Evaluation of SP95 and SP125 Superpave Mixtures
    Performance Evaluation of SP-9.5 and SP-12.5 Superpave Mixtures
    Hu, Sheng ;
    Zhou, Fujie
    2022-06-01 | PDF
    Current Florida Department of Transportation specifications allow the use of Superpave (SP)-12.5/Friction Course (FC)-12.5 mixtures in heavy traffic levels (e.g., level E), but not SP-9.5/FC-9.5 mixtures. The main goal of this project is to compare the performance of SP-9.5/FC-9.5 to SP-12.5/FC-12.5 Superpave asphalt mixtures and then determine if ...
  • A Pavement Marking Inventory and Retroreflectivity Condition Assessment Method Using Mobile LiDAR
    A Pavement Marking Inventory and Retroreflectivity Condition Assessment Method Using Mobile LiDAR
    Ai, Chengbo ;
    Hennessy, Emily
    2022-06-01 | PDF
    FHWA is proposing regulations to guide minimum pavement marking retroreflectivity levels, which poses a potential challenge to MassDOT, as the current practice of visual inspection is labor intensive, and the results can be subjective. To address the identified challenges and needs from MassDOT, the objective of this research is twofold: (1) to ser ...
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