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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 2081 - 2100 of 36151 results
  • 2022 GDOT Employee Survey
    2022 GDOT Employee Survey
    DeMeester, Karen ;
    Simmons, Brian
    2023-04-01 | PDF
    The research team which included faculty from University of Georgia’s College of Engineering and Carl Vinson Institute of Government worked in collaboration with the Georgia Department of Transportation (GDOT) to conduct the 2022 GDOT employee survey. This research study aimed to increase the response rate and the usefulness of the feedback from th ...
  • Shear and Bearing Capacity of Corroded Steel Beam Bridges and the Effects on Load Rating
    Shear and Bearing Capacity of Corroded Steel Beam Bridges and the Effects on Load Rating
    Kanakamedala, Deven ;
    Seo, Jungil
    2023-04-01 | PDF
    Corrosion in the girders of steel girder bridges often occurs due to the deicing salts, water, and other debris that leak through the deck joints into the web and bottom flange at the girder ends. Corrosion causes loss of cross-sectional area leading to a reduction in section properties of the member, which eventually results in a reduction in stru ...
  • Implementation of Balanced Asphalt Mix Design of Asphalt Mixtures Prepared with Reclaimed Asphalt Pavements and Rejuvenators for Enhanced Performance
    Implementation of Balanced Asphalt Mix Design of Asphalt Mixtures Prepared with Reclaimed Asphalt Pavements and Rejuvenators for Enhanced Performance
    Kassem, Emad ;
    Hatailah, Hussain Al
    2023-04-01 | PDF
    The use of Reclaimed Asphalt Pavement (RAP) promotes and integrates sustainable solutions into civil engineering practices. Many transportation agencies limit the RAP content to a small percentage. Despite the environmental benefits and cost savings of incorporating RAP into asphalt mixtures, it may result in stiffer mixtures, especially at a highe ...
  • Noise Measurements of US41 Transverse Rumble Strips
    Noise Measurements of US-41 Transverse Rumble Strips
    El-Rayes, Khaled ;
    Ignacio, Ernest-John
    2023-04-01 | PDF
    This report focuses on collecting and analyzing external and internal noise levels generated by the modified transverse rumble strips on US-41 that were reconstructed in October 2022. The goal is to enable a comparison with noise levels generated by the previous rumble strips that were constructed in the same location in 2019. This work is organize ...
  • Drainage 101 County Roadways City Street and Drainageways Best Practices and Resource Guide
    Drainage 101 County Roadways, City Street and Drainageways: Best Practices and Resource Guide
    Arvidson, Tim
    2023-04-01 | PDF
    The time individual engineers, administrators and their staff invest in researching drainage law and defining the best approach to solving drainage issues can be considerable. This document provides quick access to information needed to solve those problems and discover legal solutions to recurring drainage issues and the time saved could be invest ...
  • Impaired Active Transportation Users
    Impaired Active Transportation Users
    Burbidge, Shaunna K. ;
    Singleton, Patrick A.
    2023-04-01 | PDF
    Researchers have determined that a significant number of pedestrian and bicycle crashes arise from intoxicated non-motorists (Hutchinson, Kloeden, and Lindsay, 2010). While driver and non-motorized fatalities have decreased significantly over several decades, the extent of alcohol involvement has declined significantly only among fatally injured dr ...
  • Grand Forks East Grand Forks 2021 Travel Demand Model Update Executive Summary
    Grand Forks East Grand Forks 2021 Travel Demand Model Update: Executive Summary
    Motuba, Diomo ;
    Habib, Muhammad Faisal
    2023-04-01 | PDF
    The Grand Forks East Grand Forks MPO's (The Forks MPO) Travel Demand Model (TDM) is updated every five years to reflect new ground truths/data and the advancements in the state-of-the-art in transportation modeling techniques and methods. The current update reflects the base year 2021 data. The model is a four-step TDM including trip generations, t ...
  • Peak Temperature Determination of Drilled Shafts Excluded From Mass Concrete Consideration in Current Specifications
    Peak Temperature Determination of Drilled Shafts Excluded From Mass Concrete Consideration in Current Specifications
    Mullins, Gray ;
    Lewis, Amanda
    2023-04-01 | PDF
    Drilled shafts are reinforced concrete deep foundation elements that typically range in diameter from 3 to 15 feet. Within the past 20 years, drilled shaft installation plans for FDOT projects have gone from requiring no mass concrete information (regardless of shaft diameter) to requiring steps to control temperature for shafts greater than 6 feet ...
  • The Role of Gender and Identity in Travel Behavior
    The Role of Gender and Identity in Travel Behavior
    Song, Ying
    2023-04-01 | PDF
    MnDOT’s Advancing Transportation Equity Initiative focuses on ensuring the transportation network, services and decision- making meet the needs of Minnesota’s underserved or underrepresented communities. Understanding the needs, challenges and overall experiences of these communities is crucial to advancing an equitable transportation system. Publi ...
  • Improving Driver Yielding to Pedestrians at Intersections Summary
    Improving Driver Yielding to Pedestrians at Intersections [Summary]
    Dallman, Amber ;
    Morris, Nichole
    2023-04-01 | PDF
    Pedestrian deaths are at a 30-year high nationally—a trend that is mirrored in Minnesota. Previous research in Saint Paul found that driver yielding significantly increased at unsignalized crosswalks following a multifaceted approach that included the installation of signage and other low-cost engineering solutions combined with enforcement through ...
  • American Micromobility Panel Part 1
    American Micromobility Panel: Part 1
    Fitch-Polse, Dillon Taylor ;
    Mohiuddin, Hossain
    2023-04-01 | PDF
    This report presents preliminary findings from the American Micromobility Panel, the largest study of shared micromobility services in the United States incorporating riders from multiple major operators. Micromobility services (bike-share and scooter-share) have recently emerged in many U.S. cities. Given that the substitution of bicycling, scooti ...
  • Effects of LED Lighting on Terrestrial Wildlife
    Effects of LED Lighting on Terrestrial Wildlife
    Longcore, Travis
    ORCID ICON IMG
    2023-04-01 | PDF
    Due to their increased efficiency and brightness, Light Emitting Diodes (LEDs) are now the first choice in outdoor lighting projects. Unlike High-Pressure Sodium lamps, which produce longer wavelengths and yellow-to-orange light, and Low-Pressure Sodium lamps, which produce near monochromatic yellow light, LEDs are usually full-spectrum white light ...
  • Determining Asphalt Mixture Properties Using Imaging Techniques
    Determining Asphalt Mixture Properties Using Imaging Techniques
    Notani, Mohammad Ali ;
    Jahangiri, Behnam
    2023-04-01 | PDF
    This study introduces imaging technology to determine the bulk specific gravity (Gmb) of compacted asphalt mixture specimens. Using an advanced three-dimensional scanner, a fast, accurate technique for determining compacted asphalt mixture specimen Gmb was developed. The feasibility of this technique was evaluated by testing a collection of asphalt ...
  • Quantifying Impacts of the COVID19 Pandemic on Ridership of CTA Rail and Bus Systems in Chicago
    Quantifying Impacts of the COVID-19 Pandemic on Ridership of CTA Rail and Bus Systems in Chicago
    Liu, Yining ;
    Osorio, Jesus J.
    2023-04-01 | PDF
    This study’s research team conducted a comprehensive statistical analysis to help transit agencies better understand factors that may have contributed to transit ridership loss and the extent of its impacts. Building off ICT-IDOT project R27-SP45, they developed a series of statistical models for the Chicago Transit Authority’s rail and bus systems ...
  • How Regional Transit Agencies Can Serve the Daily Mobility Needs of the Unhoused Population
    How Regional Transit Agencies Can Serve the Daily Mobility Needs of the Unhoused Population
    Nations, Jennifer ;
    Fu, Yao
    2023-04-01 | PDF
    With more people experiencing homelessness in California cities, some transit agencies have begun to comprehensively address the needs of people experiencing homelessness, a population which historically may not have been included in their planning. Research suggests that people experiencing homelessness rely on public transit for the same variety ...
  • Overview of Motor Vehicle Traffic Crashes in 2021
    Overview of Motor Vehicle Traffic Crashes in 2021
    Stewart, Timothy
    2023-04-01 | PDF
    This technical report provides an overview of motor vehicle traffic crashes in 2021. There were 42,939 people killed in motor vehicle traffic crashes on U.S. roadways during 2021, a 10-percent increase from 39,007 fatalities in 2020, or 3,932 more people killed in traffic crashes in 2021. The estimated number of people injured on our roadways incre ...
  • The Future of the Louisiana Waterways Transport System A System Analysis and Plan to Move Commerce by Water Tech Summary
    The Future of the Louisiana Waterways Transport System: A System Analysis and Plan to Move Commerce by Water [Tech Summary]
    Cruz, Ricardo ;
    Mitran, Elisabeta
    2023-04-01 | PDF
    To be able to develop this plan with a capability of providing a level of planning and forecasting guidance, it is necessary to identify the type and value of waterborne commerce, thereby providing the focus for the analysis and documentation of the impact and importance of waterborne commerce on the state of Louisiana, its transportation system, a ...
  • Automated Safety Assessment of Rural Roadways Using Computer Vision
    Automated Safety Assessment of Rural Roadways Using Computer Vision
    Mashhadi, Ali Hassandokht ;
    Rashidi, Abbas
    2023-04-01 | PDF
    Roadside elements play an important role in the number and severity of crashes. Rigid obstacles (trees, rocks, embankments, etc.), guardrails, clear zones, and side slopes are among the factors that might affect roadside safety. The Federal Highway Administration (FHWA) presented a rating system to help DOTs and transportation agencies make better ...
  • Functional Characteristics of DenseGraded Asphalt Surface Mixtures
    Functional Characteristics of Dense-Graded Asphalt Surface Mixtures
    Boz, Ilker ;
    Flintsch, Gerardo W
    2023-04-01 | PDF
    This study assessed the short-term functional (surface) characteristics of pavements constructed using dense-graded asphalt surface mixtures designed with the balanced mix design (BMD) methodology as compared to counterpart mixtures designed using the existing design methodology (Superpave). Another objective of this study was to establish a functi ...
  • Transverse Rumble Strips at Rural Intersections
    Transverse Rumble Strips at Rural Intersections
    Hallmark, Shauna ;
    Oneyear, Nicole
    2023-04-01 | PDF
    As a low-cost countermeasure to rural intersection crashes, transverse rumble strips (TRS) provide an audible and tactile warning to drivers approaching an intersection with the primary goal of decreasing crashes that result from running a stop sign. The objective of this project is to evaluate the effectiveness of different TRS patterns on stoppin ...
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