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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 1601 - 1620 of 36104 results
  • Montana Department of Transportation Research Peer Exchange Summary Report September 1213 2023
    Montana Department of Transportation Research Peer Exchange Summary Report (September 12–13, 2023)
    Walker-Keleher, Peter ;
    Eslinger, Shari
    2023-11-01 | PDF
    The Montana Department of Transportation (MDT) hosted a research peer exchange in Helena, Montana, on September 12-13, 2023. The objectives for this peer exchange were to identify actionable improvements to implement or change in the beginning (idea of contract) and the end of (research conclusion to implementation) of the research business process ...
  • Response of San Joaquin Kit Foxes to Road Construction Project Sites Mitigation Strategies to Minimize Project Delays and Impacts
    Response of San Joaquin Kit Foxes to Road Construction Project Sites: Mitigation Strategies to Minimize Project Delays and Impacts
    Cypher, Brian ;
    Noel, Erika
    2023-11-01 | PDF
    The California Department of Transportation (Caltrans) occasionally conducts construction projects within the range of the San Joaquin kit fox (Vulpes macrotis mutica), which is a Federally Endangered and California Threatened species. Caltrans routinely implements mitigation measures to avoid or minimize adverse impacts to kit foxes. However, kit ...
  • Speed Limit Change 55 mph to 60 mph Safety ReEvaluation
    Speed Limit Change (55 mph to 60 mph) Safety Re-Evaluation
    Saleem, Taha ;
    Srinivasan, Raghavan
    2023-11-01 | PDF
    The objective of this study was to evaluate the safety impacts of increasing the speed limit from 55 mph to 60 mph on twolane, two-way state highway road segments in Minnesota. An empirical Bayes (EB) before-after analysis was used to estimate crash modification factors (CMFs) for both segments and intersections. The segment analysis showed an 8 pe ...
  • Evaluation of Crumb Rubber Modification of Louisiana Mixtures Technical Summary
    Evaluation of Crumb Rubber Modification of Louisiana Mixtures [Technical Summary]
    Salari, Saman ;
    Cooper III, Samuel
    2023-11-01 | PDF
    The objective of this research was to evaluate the effect of CR modification on the performance of asphalt mixtures used in Louisiana.
  • Evaluating Benefits of Stratifying Cost of Injuries by Severity in CDOT BenefitCostAnalysis
    Evaluating Benefits of Stratifying Cost of Injuries by Severity in CDOT Benefit-Cost-Analysis
    McCarthy, Gillian ;
    Kononov, Jake
    2023-11-01 | PDF
    The aim of this study was to investigate whether stratifying the degree of injury by severity and assigning specific dollar costs to each severity level would enhance the quality of project selection. The results strongly suggest a distinction between a composite and a stratified approach in allocating injury crash costs within a Benefit Cost Analy ...
  • Fatality Reductions Abroad A Survey of Success From Foreign Jurisdictions
    Fatality Reductions Abroad: A Survey of Success From Foreign Jurisdictions
    Burbidge, Shaunna K. ;
    Anderson, Camille
    2023-11-01 | PDF
    Despite intensive efforts on the part of the Utah Department of Transportation (UDOT) and Vision Zero, fatalities in the state of Utah have seen only a modest decrease, with the most recent years exhibiting an uptick in fatalities. Achieving a goal of zero road fatalities is of great importance to UDOT. Using an extensive network of contacts abroad ...
  • Driver Behavior and Performance in HightoLow Speed Transition Zones
    Driver Behavior and Performance in High-to-Low Speed Transition Zones
    Srinivasan, Raghavan ;
    Chakraborty, Meghna
    2023-11-01 | PDF
    This study compiled site characteristics from 338 transition zones in North Carolina. Out of these locations, speed data were compiled from 50 locations (for 37 locations, speed data were compiled in the field; for the remaining 13 locations, INRIX was used to compile the data). These 50 locations represented 9 different categories of speed limit t ...
  • Evaluation of Crumb Rubber Modification of Louisiana Mixtures
    Evaluation of Crumb Rubber Modification of Louisiana Mixtures
    Salari, Saman ;
    Mata, David
    2023-11-01 | PDF
    Since 2008, the Louisiana Department of Transportation and Development (DOTD) has permitted the use of crumb rubber modifiers (CRM) in hot mix asphalt (HMA) mixtures in accordance with its specifications. However, crumb rubber (CR)modification has presented unique challenges during the design and production of the mixtures. Louisiana DOTD district ...
  • Highway Safety Culture Assessment through Louisianas Regions
    Highway Safety Culture Assessment through Louisiana’s Regions
    Schneider, Helmut ;
    Smith, Scott
    2023-11-01 | PDF
    Human behavior and errors in human judgment account for a large proportion of roadway crashes in the United States. Most priorities in Louisiana’s Strategic Highway Safety Plan involve human behavior. A comprehensive understanding of highway safety culture throughout Louisiana’s regions will enhance the state’s public outreach and education efforts ...
  • Evaluation of NearMiss Crashes Using a VideoBased Tool Summary
    Evaluation of Near-Miss Crashes Using a Video-Based Tool [Summary]
    Kondyli, Alexandra ;
    Schrock, Steven D.
    2023-11-01 | PDF
    This research investigated the prediction accuracy of a video-based tool developed by Transoft Solutions for predicting near-miss crashes at signalized intersections. The research team selected two signalized intersections in Overland Park, Kansas, and collected two weeks of video data from both locations. Only weekday data were collected for the t ...
  • OSTR Research Roundup Newsletter November 2023
    OST-R Research Roundup Newsletter: November 2023
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2023-11-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Exploration of Drone and Remote Sensing Technologies in Highway Embankment Monitoring and Management Phase I Report
    Exploration of Drone and Remote Sensing Technologies in Highway Embankment Monitoring and Management (Phase I) [Report]
    Zhang, Zhongjie ;
    Chen, Qiming
    2023-11-01 | PDF
    Monitoring the spatial-temporal variation of surface moisture content in highway soil embankment/dam has a practical implication for earth embankment/dam safety. The knowledge of soil moisture content on the surface of earth embankment/dams can help engineers monitor the dynamic evolvement of slope stability due to the adverse effect of excessive m ...
  • A Synthesis of Economic Impact Assessment of Transit Services
    A Synthesis of Economic Impact Assessment of Transit Services
    Peng, Zhong-Ren ;
    Liu, Yanghe
    2023-11-01 | PDF
    This report provides an in-depth synthesis of the economic impact assessment of transit services in the United States from 2003 to 2023, focusing on Benefit-Cost Analysis (BCA) and Economic Impact Analysis (EIA) methodologies. It examines their application in public transit systems and highlights geographical variations and trends. The report analy ...
  • BMP For Issues with Asphalt Centerline Joint and Intelligent Compaction for Local Agencies
    BMP For Issues with Asphalt Centerline Joint and Intelligent Compaction for Local Agencies
    Haider, Syed W. ;
    Muslim, Hamad Bin
    2023-11-01 | PDF
    It is well-known that longitudinal joint construction quality is critical to flexible pavement life. The maintenance activities caused by longitudinal joint deterioration's direct or indirect effects and raveling problems along the centerline paving joint of asphalt roadways have become challenging for many highway agencies. A poorly constructed jo ...
  • Evaluating and Communicating the Value of Research
    Evaluating and Communicating the Value of Research
    Saeedi, Rahil ;
    Yuan, Jia
    2023-11-01 | PDF
    In FY2022, the MnDOT Office of Research and Innovation managed a total of 215 active and completed projects, of which 75 received partial or full funding from the Local Road Research Board (LRRB). Evaluating the benefits of this research and effectively communicating the benefits to diverse audiences serves several important purposes. It helps both ...
  • Exploration of Drone and Remote Sensing Technologies in Highway Embankment Monitoring and Management Phase I Tech Summary
    Exploration of Drone and Remote Sensing Technologies in Highway Embankment Monitoring and Management (Phase I) [Tech Summary]
    Zhang, Zhongjie ;
    Chen, Qiming
    2023-11-01 | PDF
    Monitoring the spatial-temporal variation of surface moisture content in highway soil embankment/dam has a practical implication for earth embankment/dam safety. The knowledge of soil moisture content on the surface of earth embankment/dams can help engineers monitor the dynamic evolvement of slope stability due to the adverse effect of excessive m ...
  • Evaluation of Netfree Erosion Control Blankets
    Evaluation of Net-free Erosion Control Blankets
    Bhattarai, Rabin ;
    Zhang, Yufan
    2023-11-01 | PDF
    Erosion control blankets (ECBs) protect soil from being detached and transported by raindrops and subsequential overland runoff while assisting in vegetation growth. ECBs have several characteristics, for example, thickness, mass per unit area, tensile strength, elongation, water absorption, etc. However, the impact of these characteristics on the ...
  • Understanding Factors That Influence Driver Yielding to Pedestrians Summary
    Understanding Factors That Influence Driver Yielding to Pedestrians [Summary]
    Stern, Raphael ;
    Pritchard, Hannah
    2023-11-01 | PDF
    This research summary was created as part of Report 2023-24, "Guidelines for safer pedestrian crossings: Understanding the factors that positively influence vehicle yielding to pedestrians at unsignalized intersections," published June 2023.
  • Identifying Deer Vehicle Collision Concentrations in Minnesota
    Identifying Deer Vehicle Collision Concentrations in Minnesota
    Stern, Raphael ;
    Moen, Ron
    2023-11-01 | PDF
    Deer-vehicle collisions (DVCs) represent a significant hazard on Minnesota roads, with roughly 1,200 DVCs reported annually to the Minnesota Department of Public Safety (MnDPS) and many more going unreported. While DVCs are common across Minnesota, local variations in deer density as well as roadway characteristics and use patterns make DVCs more l ...
  • Sinusoidal Rumble Strips Safety Evaluation
    Sinusoidal Rumble Strips Safety Evaluation
    Storm, Richard ;
    Herring, Rebecca
    2023-11-01 | PDF
    This evaluation determined the change in crash frequency, type or severity associated with longitudinal sinusoidal rumble strips on rural two-lane undivided Minnesota roadways constructed between 2018 and 2022. Crash modification factors (CMFs) were estimated using cross-sectional analysis to compare crash experience of locations with sinusoidal ru ...
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