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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 1981 - 2000 of 35865 results
  • Effects of LED Lighting on Terrestrial Wildlife
    Effects of LED Lighting on Terrestrial Wildlife
    Longcore, Travis
    ORCID ICON IMG
    2023-04-01 | PDF
    Due to their increased efficiency and brightness, Light Emitting Diodes (LEDs) are now the first choice in outdoor lighting projects. Unlike High-Pressure Sodium lamps, which produce longer wavelengths and yellow-to-orange light, and Low-Pressure Sodium lamps, which produce near monochromatic yellow light, LEDs are usually full-spectrum white light ...
  • Determining Asphalt Mixture Properties Using Imaging Techniques
    Determining Asphalt Mixture Properties Using Imaging Techniques
    Notani, Mohammad Ali ;
    Jahangiri, Behnam
    2023-04-01 | PDF
    This study introduces imaging technology to determine the bulk specific gravity (Gmb) of compacted asphalt mixture specimens. Using an advanced three-dimensional scanner, a fast, accurate technique for determining compacted asphalt mixture specimen Gmb was developed. The feasibility of this technique was evaluated by testing a collection of asphalt ...
  • How Regional Transit Agencies Can Serve the Daily Mobility Needs of the Unhoused Population
    How Regional Transit Agencies Can Serve the Daily Mobility Needs of the Unhoused Population
    Nations, Jennifer ;
    Fu, Yao
    2023-04-01 | PDF
    With more people experiencing homelessness in California cities, some transit agencies have begun to comprehensively address the needs of people experiencing homelessness, a population which historically may not have been included in their planning. Research suggests that people experiencing homelessness rely on public transit for the same variety ...
  • Methods for Sealing Vertical Cracks on Concrete Structures
    Methods for Sealing Vertical Cracks on Concrete Structures
    Sufian, Abu Ahmed ;
    Lee, Hyung S
    2023-04-01 | PDF
    The Florida Department of Transportation (FDOT) has had inconsistent success in sealing vertical cracks in concrete structures. This necessitated the investigation of the performance of different sealant types and application methods to address the concern of proper crack sealing in concrete substructures that cannot be routinely investigated. For ...
  • Implementation of Balanced Asphalt Mix Design of Asphalt Mixtures Prepared with Reclaimed Asphalt Pavements and Rejuvenators for Enhanced Performance
    Implementation of Balanced Asphalt Mix Design of Asphalt Mixtures Prepared with Reclaimed Asphalt Pavements and Rejuvenators for Enhanced Performance
    Kassem, Emad ;
    Hatailah, Hussain Al
    2023-04-01 | PDF
    The use of Reclaimed Asphalt Pavement (RAP) promotes and integrates sustainable solutions into civil engineering practices. Many transportation agencies limit the RAP content to a small percentage. Despite the environmental benefits and cost savings of incorporating RAP into asphalt mixtures, it may result in stiffer mixtures, especially at a highe ...
  • Financing the Future Examining the Fiscal Landscape of California Public Transit in the Wake of the Pandemic
    Financing the Future: Examining the Fiscal Landscape of California Public Transit in the Wake of the Pandemic
    Wasserman, Jacob L. ;
    Gahbauer, John
    2023-04-01 | PDF
    California and its regional and local governments have invested heavily in public transit over the past half-century to provide an alternative to driving, ease traffic congestion, reduce emissions, slow climate change, steer new development, and provide mobility for those without. As a result, bus service has improved and expanded, and many parts o ...
  • 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 ...
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