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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 2481 - 2500 of 35909 results
  • Recommendations for Nondestructive Testing NDT of Concrete Components for PerformanceBased Specifications
    Recommendations for Nondestructive Testing (NDT) of Concrete Components for Performance-Based Specifications
    Jacobs, Laurence J. ;
    Kurtis, Kimberly E
    2022-08-01 | PDF
    This research investigates non-destructive testing (NDT) techniques for the quality assurance of portland cement concrete pavements and structures. Responses were collected from a survey distributed amongst AASHTO Committee of Materials and Pavements (CoMP) members regarding their use of NDT technologies. Relevant literature was reviewed to determi ...
  • Simulating Life with PersonallyOwned Autonomous Vehicles through a Naturalistic Experiment with Personal Drivers
    Simulating Life with Personally-Owned Autonomous Vehicles through a Naturalistic Experiment with Personal Drivers
    Harb, Mustapha ;
    Malik, Jai
    2022-08-01 | PDF
    Forty-three households in the Sacramento region representing diverse demographics, modal preferences, mobility barriers, and weekly vehicle miles traveled (VMT) were provided personal chauffeurs for one or two weeks to simulate travel behavior with a personally-owned, fully autonomous vehicle (AV). During the chauffeur week(s), the total number of ...
  • Developing Countermeasures to Decrease Pedestrian Deaths Guidebook
    Developing Countermeasures to Decrease Pedestrian Deaths: Guidebook
    Kockelman, Kara ;
    Perrine, Kenneth A.
    2022-08-01 | PDF
    This guidebook is designed to enable practitioners at all levels of government to select the most cost-effective pedestrian-safety treatments for a wide variety of Texas contexts and reverse the rise in pedestrian deaths on Texas roadways. It provides a framework for prioritizing problematic intersections and corridors, analyzing the impact of rele ...
    Supporting Files
  • Implementation Evaluating Bridge Behavior Using UltraHighResolution NextGeneration Digital Image Correlation DIC Applications in Bridge Inspection and Damage Assessment
    Implementation Evaluating Bridge Behavior Using Ultra-High-Resolution Next-Generation Digital Image Correlation (DIC): Applications in Bridge Inspection and Damage Assessment
    Rajae, Shima ;
    Ghorbani, Rasool
    2022-08-01 | PDF
    The Civil Infrastructure Vision (CIV) system is an integrated software/hardware system is based on principles of Digital Image Correlation (DIC) developed at UTSA for TxDOT. The system can be used to monitor surface deformations on bridges to accuracies on the order of 1/1,000th in. Project objectives included training DOT on using the system durin ...
  • Economic Impact of Access Management Treatments Research Project Capsule 224SS
    Economic Impact of Access Management Treatments: Research Project Capsule [22–4SS]
    Barnes, Stephen ;
    Rupnow, Tyson
    2022-08-01 | PDF
    The overall goal of this research is to assess the economic impact of access management techniques on businesses in the corridor where such projects have been implemented in Louisiana. A secondary goal is to assess the perception of businesses near completed projects. Specifically, the objectives are to (1) identify current state of knowledge about ...
  • Division of Engineering Research OnCall Services 20202023 Task 5 Detention Basin Water Quality Outlet Redesign
    Division of Engineering Research On-Call Services 2020-2023 Task 5: Detention Basin Water Quality Outlet Redesign
    McCabe, Mark ;
    White, Kevin
    2022-08-01 | PDF
    The Ohio Department of Transportation is interested in evaluating and assessing options related to the current detention basin design to collect information from peer DOTs on design standards associated with detention basin details that include basin designs, outlet structures, low-flow channels, and emergency spillway. Based on AASHTO DOT response ...
  • Effectiveness of Speed Management Methods in Work Zones
    Effectiveness of Speed Management Methods in Work Zones
    Brown, Henry ;
    Edara, Praveen
    2022-08-01 | PDF
    Management of speeds is a significant component of any strategy to reduce work zone crashes. The objective of this study is to investigate the effectiveness of speed management countermeasures, such as speed display trailer, speed display trailer with red and blue lights, work vehicle with red and blue lights, and active and passive law enforcement ...
  • Field Test Bed for Evaluating Embedded Vehicle Sensors With Indiana Companies
    Field Test Bed for Evaluating Embedded Vehicle Sensors With Indiana Companies
    Habib, Ayman ;
    Bullock, Darcy M.
    2022-08-01 | PDF
    With the advent of modern sensing technology, mapping products have begun to achieve an unprecedented precision of measurement. Considering their diverse use cases, several factors play a role in what would make the resulting measurements accurate. For light detection and ranging (LiDAR) and photogrammetry-based mapping solutions that implement veh ...
  • 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 ...
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