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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 2001 - 2020 of 35888 results
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Evaluating Total Maximum Daily Load Pollutants from ADOTs Storm Sewer System Discharges
    Evaluating Total Maximum Daily Load Pollutants from ADOT’s Storm Sewer System Discharges
    Sydnor, Rebecca ;
    Garman, Jay
    2023-04-01 | PDF
    In accordance with the requirements of the Clean Water Act, discharges from municipal separate storm sewer systems (MS4s) to the waters of the U.S. are regulated for pollutants. ADOT holds an MS4 permit and is therefore responsible for the quality of water discharged from its storm sewer system. ADOT is currently named as a contributor of the pollu ...
  • 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 ...
  • Study of Impacts of Technology on the Future Workforce at the MDOT SHA
    Study of Impacts of Technology on the Future Workforce at the MDOT SHA
    Han, Chaodong ;
    Otto, James
    2023-04-01 | PDF
    Artificial intelligence, robotic process automation, natural language processing and virtual collaboration technologies are transforming the landscape of the office and administrative workforce by automating non-value added, repetitive tasks and processes, as well as supporting remote and flexible work. The scope of this study is to provide recomme ...
  • 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 ...
  • Establishment of Wildflower Islands to Enhance Roadside Health Ecological Value and Aesthetics Phase II
    Establishment of Wildflower Islands to Enhance Roadside Health, Ecological Value, and Aesthetics Phase II
    Ebbers, Jackson ;
    Hillhouse, Heidi
    2023-03-31 | PDF
    Roadsides play an ever-increasing role in sustaining biodiversity. In 2020, we launched a project on backslopes along Highways 2 and 77 evaluating seeding and mowing treatments to enhance beneficial forbs including milkweed (Asclepias spp.) species. Analyses showed that seeding increased forb diversity, total forb cover, and floristic quality. Howe ...
  • Adaption of 3D Scanning Technology for High Precision Bridge Inspection
    Adaption of 3D Scanning Technology for High Precision Bridge Inspection
    Hain, Alexandra ;
    Zaghi, Arash Esmaili
    2023-03-31 | PDF
    Corrosion at beam ends is one of the most widespread causes of damage in steel bridges. Accurate determination of the level of section loss due to corrosion damage is critical for estimating the bearing capacity and load rating of a bridge. Current evaluation methods are labor intensive and dependent on subjective assessments by inspectors. Unique ...
  • Characterization of Soil and Rock for Transportation Infrastructure Using Seismic Methods in Wyoming Data Management Plan
    Characterization of Soil and Rock for Transportation Infrastructure Using Seismic Methods in Wyoming [Data Management Plan]
    Griffiths, Shawn C. ;
    Poudal, Rishav
    2023-03-31 | PDF
    Perform seismic testing at nine sites throughout Wyoming and attempt to correlate seismic data with pile driving records, rock strength, and depth of transitional material.
  • D1 Flex Beam Field Instrumentation Load Testing of Innovative Bridge Design
    D-1 Flex Beam Field Instrumentation & Load Testing of Innovative Bridge Design
    Gonzalez, Bryan ;
    Hodgson, Ian
    2023-03-31 | PDF
    This report presents a study of an innovative superstructure system, termed Flex Beam, for short-span highway bridge applications. The system is comprised of inverted steel tee sections embedded in a concrete deck. An innovative mechanism for interface shear transfer between steel and concrete is provided by transverse deck reinforcement bars which ...
  • Develop a Study for Geosynthetic Materials for Use in Reducing Pavement Section Thickness
    Develop a Study for Geosynthetic Materials for Use in Reducing Pavement Section Thickness
    Rodriguez, Julissa J. Larios ;
    Hajj, Elie Y
    2023-03-24 | PDF
    Geosynthetics have been used to reinforce aggregate base courses to increase the structural support from the base to the pavement structure. This project aims to develop a study framework to evaluate and quantify the structural benefits under Nevada conditions. To achieve this objective, a five-stage research plan was developed to support a control ...
  • Continuation of Carbon Nanotubes Additives for Structural and Highway Concrete
    Continuation of Carbon Nanotubes Additives for Structural and Highway Concrete
    Sachs, Steven G ;
    Sun, Zhe
    2023-03-15 | PDF
    The purpose of this project was to evaluate the performance of carbon nanotube (CNT)-reinforced concrete. Carbon nanotubes have exceptional mechanical properties and small scales. Combining them with composite material enables engineers to further modify material microstructure. Carbon nanotubes have been used extensively in modifying cement proper ...
  • Integrating Road Weather Technology Data in Highway Operations
    Integrating Road Weather Technology Data in Highway Operations
    Franz, Mark L. ;
    Pack, Michael L.
    2023-03-10 | PDF
    Inclement weather can significantly impact the performance of any transportation system, including roadways. Effective roadway operations and maintenance requires quality weather data to estimate real-time and near-future road conditions. While there are several sources of such data such as radar, Road Weather Information Systems (RWIS), and Mobile ...
  • Aerial Infrared Scanning of Bridge Decks for Detecting and Mapping Delaminations
    Aerial Infrared Scanning of Bridge Decks for Detecting and Mapping Delaminations
    Carmichael, Adam ;
    Bates, Spencer
    2023-03-02 | PDF
    The objective of this project was to demonstrate and evaluate a highly efficient and economical method for evaluation of the condition of bridge decks in Alaska. The method, Aerial Infrared Thermography (Aerial IR), implements traditional infrared thermography from a fixed-wing aircraft using high resolution infrared and visual cameras. To address ...
  • Updating 2019 Safe Corridors Reports
    Updating 2019 Safe Corridors Reports
    Hopwood, Cory ;
    Motamed, Megan
    2023-03-01 | PDF
    NJDOT, in conjunction with the Division of State Police, is required to submit a Safe Corridors Program Assessment Report annually under N.J.S.A. 39:3-20.4. Therefore, there is a need to provide results of the safe corridor areas, as well as the highway safety projects and programs paid for by the fund, within the past year to the Senate Transporta ...
  • Characterizing Strength Loss in High Plasticity Clays along Alabama Highways
    Characterizing Strength Loss in High Plasticity Clays along Alabama Highways
    Xuan, Mengwei ;
    Montgomery, Jack
    2023-03-01 | PDF
    Strength loss in high plasticity clay soils is a common occurrence along roadways in western and central Alabama and has considerable impact on pavement distress and slope failures. Approximately $16 million was spent to repair slope failures in western and central Alabama between 2005 and 2015 with many of these failures occurring in areas with hi ...
  • Updating 2019 Safe Corridors Reports Technical Brief
    Updating 2019 Safe Corridors Reports [Technical Brief]
    Hopwood, Cory ;
    Motamed, Megan
    2023-03-01 | PDF
    The goal of the Safe Corridor Program is to identify corridors with high rates of serious and fatal injury crashes and reduce these crashes in the short-term through the use enforcement and engineering. Both components contribute to the goal of reducing serious injury crashes by encouraging drivers to change poor behaviors within safety corridors a ...
  • Performance of Concrete Overlays over Full Depth Reclamation
    Performance of Concrete Overlays over Full Depth Reclamation
    King, Daniel ;
    Akakin, Tumer
    2023-03-01 | PDF
    Concrete overlays of full depth reclamation (FDR) are a pavement rehabilitation option involving reclamation of existing pavement layers while providing a new concrete surface to the roadway. This report reviewed nine concrete overlays of FDR that have been constructed in three states since 2006. Design and construction details were collected for e ...
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