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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 2581 - 2600 of 36114 results
  • Can Automated Vehicles See in Minnesota Ambient Particle Effects on LiDAR
    Can Automated Vehicles "See" in Minnesota? Ambient Particle Effects on LiDAR
    Northrop, William ;
    Zhan, Lu
    2022-08-01 | PDF
    This project will use a combination of laboratory experimentation and road demonstrations to better understand the reduction of LiDAR signal and object detection capability under adverse weather conditions found in Minnesota. It will also lead to concepts to improve LiDAR systems to adapt to such conditions through better signal processing image re ...
  • Interlaboratory Study for the Indirect Tensile Cracking Test at Intermediate Temperature Phase II
    Interlaboratory Study for the Indirect Tensile Cracking Test at Intermediate Temperature: Phase II
    Habbouche, Jhony ;
    Boz, Ilker
    2022-08-01 | PDF
    The indirect tensile cracking test (IDT-CT) is performed in accordance with ASTM D8225-19. This test method does not currently contain precision estimates and associated statements. This creates potential issues when test results are different among individual laboratories conducting testing on the same asphalt mixture. In 2020, Phase I of an IDT-C ...
  • Costeffective Roadside Revegetation Methods to Support Insect Pollinators
    Cost-effective Roadside Revegetation Methods to Support Insect Pollinators
    Mitchell, Timothy ;
    Verhoeven, Michael
    2022-08-01 | PDF
    Roadsides contain promising habitat for insect pollinators, yet roadside restorations can be expensive and are rarely evaluated for effectiveness. Where do we establish pollinator-friendly revegetation to maximize benefits? How effective are current revegetation practices at providing habitat for pollinators? We address these questions with two stu ...
  • Rumble Strip Design Analysis To Contribute to Low Exterior Noise Using Finite Element Modeling
    Rumble Strip Design Analysis To Contribute to Low Exterior Noise Using Finite Element Modeling
    Zheng, Jinta ;
    Zhang, Yue
    2022-08-01 | PDF
    Optimal rumble strips/stripes are critical to ensure traffic safety and simultaneously avoid disturbance to the surrounding environment. In this project, we have utilized a commercial Finite Element modeling tool to calculate the amount of noise in the tires while rolling over the rumble strips. The sound level is determined within the tire cavity. ...
  • Development of an UltraAccelerated Test to Evaluate ASR Potential in Concrete
    Development of an Ultra-Accelerated Test to Evaluate ASR Potential in Concrete
    Tanner, Jennifer Eisenhauer ;
    Hossain, Md Tarik
    2022-08-01 | PDF
    Develop and ultra-accelerated test method to evaluate ASR potential in concrete. An autoclave method was used to evaluate suitability for aggregates to be used in concrete. This process shortens the test duration from one-year down to one week.
  • Load Rating Assessment of Three SlabSpan Bridges Over Shingle Creek
    Load Rating Assessment of Three Slab-Span Bridges Over Shingle Creek
    Hill, Kendall A ;
    Dymond, Benjamin Z
    2022-08-01 | PDF
    Three slab-span bridges crossing Shingle Creek in Brooklyn Center, Minnesota, have poor American Association of State Highway and Transportation Officials (AASHTO) load rating factors for certain truck configurations. Characterization of load distribution is useful for determining the load rating of bridges, but results in the literature have shown ...
  • Implementation of Portable WeighinMotion WIM Technology on Texas Highways Technical Report
    Implementation of Portable Weigh-in-Motion (WIM) Technology on Texas Highways: Technical Report
    Prakoso, Adrianus ;
    Chunduri, Harshavardhan
    2022-08-01 | PDF
    There are a limited number of available permanent WIM stations on the Texas highway network. As such, it is not feasible to generate accurate load spectra data required for pavement design, maintenance, and rehabilitations on every highway project. The net result is unoptimized designs or poor performing pavement structures with increased maintenan ...
  • Performance of UltraThin Bonded Wearing Course UTBWC During Winter Snow Ice Events in Maryland Research Summary
    Performance of Ultra-Thin Bonded Wearing Course (UTBWC) During Winter Snow Ice Events in Maryland [Research Summary]
    Goulias, Dimitrios
    2022-08-01 | PDF
    The goal of this study was to investigate how prevalent the problem is in Maryland, to assess the performance of UTBWC surfaces, and whether any issue is dependent on specific weather and/or winter treatment maintenance.
  • Traffic Safety Facts Driver Electronic Device Use in 2021
    Traffic Safety Facts: Driver Electronic Device Use in 2021
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2022-08-01 | National Transportation Statistics (NTS) | PDF
    The percentage of passenger vehicle drivers talking on handheld phones decreased from 2.6 percent in 2020 to 2.5 percent in 2021 (Figure 1 and Table 1). The percentage of drivers speaking with visible headsets while driving remained unchanged from the previous year’s level of 0.4 percent (Figure 1 and Table 2). Drivers’ visible manipulation of hand ...
  • Seismic Approach to Quality Management of HMA
    Seismic Approach to Quality Management of HMA
    Park, Choon ;
    Starkhammar, Josefin
    2022-08-01 | PDF
    We provide a final summary report of the project executed during last 2.5-year period (January 2020 - June 2022). The project tasks are summarized in the following scope of work (SOW): • Task #1: Project Management and Administration • Task #2: Hardware Development (Seismic Data Acquisition System) & Testing • Task #3: Software Development & Testin ...
  • Development of a Strategy To Address Load Posted Bridges Through Reduction in Uncertainty in Load RatingsVolume 3 Refined Load Rating Recommendations and Examples
    Development of a Strategy To Address Load Posted Bridges Through Reduction in Uncertainty in Load Ratings—Volume 3: Refined Load Rating Recommendations and Examples
    Hueste, Mary Beth ;
    Hurlebaus, Stefan
    2022-08-01 | PDF
    Maintaining the functionality of the transportation infrastructure depends on the successful management of aging bridge assets. Departments of Transportation rely on the load rating process to evaluate the sufficiency of the bridge structures in their state, and post load restrictions if the capacity of a bridge does not meet the maximum load effec ...
  • Performance of Ground Tire Rubber Modified Asphalt Mixture Overlays Over Jointed Concrete Pavements on US 60 in the Virginia Department of Transportations Richmond District
    Performance of Ground Tire Rubber Modified Asphalt Mixture Overlays Over Jointed Concrete Pavements on US 60 in the Virginia Department of Transportation’s Richmond District
    Nair, Harikrishnan ;
    Hossain, Shabbir
    2022-08-01 | PDF
    Ground tire rubber (GTR) from scrap tires is used in asphalt mixtures (rubber modified asphalt [RMA]) for improving the performance of pavements. There are different ways to add GTR in asphalt mixtures, but the two primary methods are referred to as the “wet” and “dry” processes. The dry process incorporates GTR directly into the asphalt mixture du ...
  • Crash Modification Factors for Contrast Pavement Markings on LightColored Pavement
    Crash Modification Factors for Contrast Pavement Markings on Light-Colored Pavement
    Williamson, Michael ;
    Singh, Sumit
    2022-08-01 | PDF
    Roadway departure crashes are a leading cause of fatal and severe injury crashes on high-speed roadways. The objective of this project was to evaluate the safety benefits of contrast pavement markings and to develop a benefit-cost analysis tool for use in project selection. A nationwide survey was developed and deployed to departments of transporta ...
  • Impacts of COVID19 on Public Transit Ridership
    Impacts of COVID-19 on Public Transit Ridership
    Qi, Yi ;
    Liu, Jinli
    2022-08-01 | PDF
    The impacts of COVID-19 on public transit have been substantial. The public transit agencies are facing unprecedented challenges, including operator absenteeism, a sharp decline in ridership, new disinfection practices, and the maintenance of personal protective equipment (PPE) for the safety of operators and riders. Meanwhile, public transit is cr ...
  • An Evaluation of the Safe Speed Limit Setting Procedure and Tool for Utah
    An Evaluation of the Safe Speed Limit Setting Procedure and Tool for Utah
    Schultz, Grant G. ;
    Ward, Cory K
    2022-08-01 | PDF
    The purpose of the research project is to evaluate the Speed Limit Setting Procedure (SLS-Procedure) found in National Cooperative Highway Research Program (NCHRP) Project 17-76 for implementation on Utah roadways with the goal of aiding the agency in overall road safety surrounding speed limits. The Speed Limit Setting Tool (SLS-Tool) automates th ...
  • Evaluation of Mitigation Measures and Development of an UltraAccelerated Test to Evaluate Alkali Silica Reaction Potential in Concrete
    Evaluation of Mitigation Measures and Development of an Ultra-Accelerated Test to Evaluate Alkali Silica Reaction Potential in Concrete
    Hossain, Md Tarik ;
    Pachel, Caleb
    2022-08-01 | PDF
    A comprehensive study was performed to evaluate mitigation options to reduce premature expansion due to alkali-silica reaction (ASR) for selected Wyoming aggregates. State-of-the-art and standardized test methods were performed, and results were used to compare expansion levels. Two different fly-ash sources were tested using the Concrete Prism Tes ...
  • Fish Passage Engineering Research
    Fish Passage Engineering Research
    Lang, Margaret ;
    Love, Michael L.
    2022-08-01 | PDF
    Caltrans Division of Research Innovation and System Information (DRISI) initiated the Fish Passage Engineering Project with the objective of evaluating the implementation of recent fish passage road crossings. Crossings that span the bankfull channel width, referred to as full span crossings, were of primary interest given their recognized benefits ...
  • Evaluation of Connected Vehicle Applications on Mahan Corridor Phase II Summary
    Evaluation of Connected Vehicle Applications on Mahan Corridor, Phase II [Summary]
    Moses, Ren
    2022-08-01 | PDF
    Florida State University researchers evaluated RSU-OBU communications that deliver signal phase and timing (SPaT) data and roadway geometry data (MAP) to OBU-equipped vehicles via digital short-range communications (DSRC), for both the efficacy of the system and for improvements in the efficiency and safety of road users along a corridor of signali ...
  • Acoustic Effectiveness of Vinyl Fence Noise Walls
    Acoustic Effectiveness of Vinyl Fence Noise Walls
    Burton, Kimberly ;
    Agarwal, Ruchi
    2022-08-01 | PDF
    There are currently a variety of materials from which noise walls can be constructed, but there has been limited research on vinyl noise walls, so this project studied the acoustic, aesthetic, and cost benefits of vinyl materials to guide future noise mitigation implementation strategies. The research team studied vinyl noise walls to determine if ...
  • Development of a Strategy To Address LoadPosted Bridges Through Reduction in Uncertainty in Load RatingsVolume 1 Basic Load Rating
    Development of a Strategy To Address Load-Posted Bridges Through Reduction in Uncertainty in Load Ratings—Volume 1: Basic Load Rating
    Hueste, Mary Beth D. ;
    Hurlebaus, Stefan
    2022-08-01 | PDF
    According to the 2016 National Bridge Inventory data, the state of Texas houses over 2100 bridges posted at load levels below the legal limit. While load postings are generally a management issue, there can be commerce, traffic, and emergency egress issues. For this reason, removing postings is always of interest. Posted structures come in all shap ...
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