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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 1481 - 1500 of 36104 results
  • Improved Load Rating Procedures for Deteriorated Unstiffened Steel Beam Ends
    Improved Load Rating Procedures for Deteriorated Unstiffened Steel Beam Ends
    Provost, Aidan ;
    Tzortzinis, Georgios
    2024-01-01 | PDF
    This report contains the contents of the project to enhance load rating methods for assessing corroded unstiffened steel beam ends for the six New England States. The first task of the project was to collect and compile inspection reports information provided by DOTs within New England. The research team was able to carefully identify trends and pa ...
  • Understanding Aggressive Driving and Ways to Reduce It Phase 1
    Understanding Aggressive Driving and Ways to Reduce It – Phase 1
    Finley, Kari ;
    Hanson, Bridget
    2024-01-01 | PDF
    How aggressive driving is defined, what factors precipitate such behavior, and what strategies effectively prevent and reduce the incidence of aggressive driving behavior are not widely understood. The proposed research sought to address these gaps through a two-phase project. The purpose of this project was to support work in Phase 1. A literature ...
  • WebBased Tool To Advance Geotechnical Data Interchange and ReliabilityBased Site Characterization Research Project Capsule 242GT
    Web-Based Tool To Advance Geotechnical Data Interchange and Reliability-Based Site Characterization: Research Project Capsule [24-2GT]
    Gautreau, Gavin P. ;
    Rupnow, Tyson
    2024-01-01 | PDF
    This research will focus on innovative practices to improve geotechnical data management, highlighting the development and implementation of a web-based platform to efficiently visualize and interpret geotechnical data, and to eventually facilitate project delivery. A web-based platform can incorporate multiple types of geotechnical and geoenvironm ...
  • Evaluation of Louisiana Maintenance and Rehabilitation Treatment Decision Matrix for CostEffective and Timely Pavement Preservation Research Project Capsule 241P
    Evaluation of Louisiana Maintenance and Rehabilitation Treatment Decision Matrix for Cost-Effective and Timely Pavement Preservation: Research Project Capsule [24–1P]
    Wu, Zhong ;
    Rupnow, Tyson
    2024-01-01 | PDF
    The objective of this study is two fold. First, the study will review and evaluate the current PMS decision matrix and provide recommendations on the trigger values for different maintenance and rehabilitation treatment types based on mechanistic-empirical pavement design, pavement performance modeling, machine learning, decision-tree optimization, ...
  • Assessment of Pedestrian Safety and Driver Behavior Near an Automated Vehicle
    Assessment of Pedestrian Safety and Driver Behavior Near an Automated Vehicle
    Morris, Nichole L. ;
    Craig, Curtis M.
    2024-01-01 | PDF
    As more automated vehicles enter shared roadways, an essential aspect of automated vehicle (AV) safety is understanding the interactions between these vehicles and other road users. Anecdotal incidents about aggressive following and overtaking behaviors at crosswalks near the Med City Mover (MCM), a low-speed automated shuttle (LSAV) pilot demonstr ...
  • Economic Impact of Access Management Treatments Technical Summary
    Economic Impact of Access Management Treatments [Technical Summary]
    Barnes, Stephen
    2024-01-01 | PDF
    This study’s objective was to determine if access management treatments in Louisiana have an economic impact on roadside businesses. The specific access management treatments observed in this study are J-turns, right-in-right-out entrances, raised medians, raised curb channelization systems, and center turn lanes. The research focused on business s ...
  • Using AVLGPS Telematics to Optimize Snowplowing
    Using AVL/GPS Telematics to Optimize Snowplowing
    Minnesota Local Road Research Board
    2024-01-01 | PDF
    Minnesota’s cities and counties continue to use data to improve operations and are leveraging newer technologies to work smarter. Use of telematics – activating communication systems to share real time information – is transforming local agencies opportunity for continuous optimization with Automatic Vehicle Location (AVL) systems using Global Posi ...
  • Innovative Pothole Repair Materials and Techniques Volume I Asphalt Pavement
    Innovative Pothole Repair Materials and Techniques Volume I: Asphalt Pavement
    Wang, Hao ;
    Chen, Xiao
    2024-01-01 | PDF
    Potholes in asphalt pavement surface have detrimental effects on asphalt pavement deterioration and traffic safety. Cost-effective pothole repair methods are needed for highway agencies at all levels. This project aims to identify and evaluate innovative tools, technologies and materials for pothole repair in New Jersey. The pothole repair methods ...
  • Driver Electronic Device Use in 2022 Traffic Safety Facts Research Note
    Driver Electronic Device Use in 2022 [Traffic Safety Facts - Research Note]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-01-01 | PDF
    The percentage of passenger vehicle drivers talking on handheld phones decreased from 2.5 percent in 2021 to 2.1 percent in 2022. The percentage of drivers speaking with visible headsets while driving remained unchanged from the previous year’s level of 0.4 percent. Drivers' visible manipulation of handheld devices decreased from 3.4 percent in 202 ...
  • Innovative Pothole Repair Materials and Techniques Volume II Concrete Structures
    Innovative Pothole Repair Materials and Techniques Volume II: Concrete Structures
    Najm, Husam ;
    Balaguru, Bala
    2024-01-01 | PDF
    Long lasting and durable repair materials are necessary for maintaining concrete pavements, concrete bridge decks, and substructure to prevent deterioration and ensure longer service life. Rapid setting cementitious patch repair materials are popular for repairing small concrete damages and providing a functional repair within few hours. Based on e ...
  • Innovative Pothole Repair Materials and Techniques Volume II Concrete Structures Technical Brief
    Innovative Pothole Repair Materials and Techniques Volume II: Concrete Structures [Technical Brief]
    Wang, Hao ;
    Venkiteela, Giri
    2024-01-01 | PDF
    Long lasting and durable repair materials are necessary for maintaining concrete pavements, concrete bridge decks, and substructure to prevent deterioration and ensure longer service life. Rapid setting cementitious patch repair materials are popular for repairing small concrete damages and providing a functional repair within few hours. Based on e ...
  • Zero Emission Concrete Mixer Trucks Comparison of Battery Electric and Hydrogen Fuel Cell Powertrains
    Zero Emission Concrete Mixer Trucks: Comparison of Battery Electric and Hydrogen Fuel Cell Powertrains
    Gruen, Jonathan
    2024-01-01 | PDF
    This study aims to compare the feasibility of battery electric and hydrogen fuel cell powertrains for concrete mixer trucks to determine which is the better zero-emission powertrain for the industry to transition towards. Duty cycle modeling simulations are used to estimate both the component specifications required to meet the operational requirem ...
  • OSTR Research Roundup Newsletter January 2024 Special TRB Edition
    OST-R Research Roundup Newsletter: January 2024 [Special TRB Edition]
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-01-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Development of Guideline for the Use of Geosynthetics in Different Roadway Layered System in Nebraska
    Development of Guideline for the Use of Geosynthetics in Different Roadway Layered System in Nebraska
    Eun, Jongwan ;
    Kim, Seunghee
    2024-01-01 | PDF
    This study evaluated the design properties of the geosynthetic reinforced soils for the roadway pavement and compared the reinforcing performance depending on different geosynthetics and soil types, particularly for a subgrade layer in Nebraska. The results obtained from a large direct shear test, pullout test, and soil chamber test with a dynamic ...
  • Innovative Pothole Repair Materials and Techniques Asphalt Pavement Technical Brief
    Innovative Pothole Repair Materials and Techniques – Asphalt Pavement [Technical Brief]
    Wang, Hao ;
    Venkiteela, Giri
    2024-01-01 | PDF
    This project aims to identify and evaluate innovative tools, technologies and materials for pothole repair in New Jersey. In particularly, the use of hot-mix asphalt, cold mix asphalt, and recycles asphalt material with preheating is investigated.
  • Using AVLGPS Telematics to Optimize Snowplowing
    Using AVL/GPS Telematics to Optimize Snowplowing
    Local Road Research Board  ...
    2024-01-01 | PDF
    Minnesota’s cities and counties continue to use data to improve operations and are leveraging newer technologies to work smarter. Use of telematics – activating communication systems to share real time information – is transforming local agencies opportunity for continuous optimization with Automatic Vehicle Location (AVL) systems using Global Posi ...
  • WisDOT Research Program 2024 Annual Report
    WisDOT Research Program: 2024 Annual Report
    Wisconsin. Department of Transportation
    2024-01-01 | PDF
    This is a report of research and technology transfer activities carried out by the Wisconsin Department of Transportation through the Part B research portion of the State Planning and Research Program of the Federal Highway Administration, U.S. Department of Transportation. The report describes activities during Federal Fiscal Year 2024, covering O ...
  • Traffic Safety Evaluation of Signalized Intersections with Retroreflective Backplates in Minnesota
    Traffic Safety Evaluation of Signalized Intersections with Retroreflective Backplates in Minnesota
    Moreland, Max ;
    Leuer, Derek
    2024-01-01 | PDF
    Between 2016 and 2021, MnDOT installed retroreflective signal backplate borders at 116 signalized intersections in Minnesota. Retroreflective signal backplate borders are intended to further increase visibility of the signal head both during the day and at night. The goal of installing retroreflectivity to backplates is to reduce crashes at the int ...
  • Laboratory and Insitu Characterization of Diatomaceous Soil with Implications for Geotechnical Design
    Laboratory and In-situ Characterization of Diatomaceous Soil with Implications for Geotechnical Design
    Wang, Jiayao, ;
    Evans, T Matthew
    2024-01-01 | PDF
    Diatomaceous soil contains large amounts of fossilized diatoms and is known to have non-textbook, often contradictory, properties: high natural water content, high liquid limit, and high compressibility, but also high shear strength. Diatomaceous deposits intersect existing and potential Oregon Department of Transportation project sites in central, ...
  • TimeDiverse DopplerOnly LEO PNT Initial Solution
    Time-Diverse Doppler-Only LEO PNT: Initial Solution
    Moore, Megan O. ;
    Psiaki, Mark L.
    2024-01-01 | PDF
    This paper develops Doppler-based Geometric Dilution of Precision (D-GDOP) analysis for time-diverse Doppler-only positioning and presents an associated batch filter. The former Doppler-only positioning solution requires at least eight satellites to be view simultaneously and discards previous Doppler measurements. In cases where fewer than eight s ...
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