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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 6761 - 6780 of 36104 results
  • Successes in Stewardship Case Studies Highlight Benefits of Multimodal Roadway Design and Green Infrastructure
    Successes in Stewardship - Case Studies Highlight Benefits of Multimodal Roadway Design and Green Infrastructure
    United States. Federal Highway Administration
    2018-07-01 | PDF
    Successes in Stewardship is a Federal Highway Administration (FHWA) bimonthly newsletter highlighting current best practices in stewardship and environmental review from around the country.
  • US 31W Jefferson County Pavement Surface Treatment Evaluation
    US 31W Jefferson County Pavement Surface Treatment Evaluation
    Scully, Tim C.
    2018-07-01 | PDF
    Reflective cracking inevitably occurs when asphaltic concrete (AC) is placed over an existing unfractured Portland cement concrete (PCC) pavement. However, manufacturers state their products will mitigate reflective cracking, therefore extending the pavement life cycle. To evaluate the performance of each manufacturer’s product, an experimental tes ...
  • Modeling Bicyclist Exposure to Risk and Crash Risk Some Exploratory Studies
    Modeling Bicyclist Exposure to Risk and Crash Risk: Some Exploratory Studies
    Lindsey, Greg ;
    Wang, Jueyu
    2018-07-01 | PDF
    This report presents models for estimating bicyclist exposure to risk and crash risk. Direct demand models for estimating weekday PM peak-period bicyclist exposure to risk are estimated from a database of PM peak-period bicycle counts in Minneapolis and used to estimate exposure for the street network. Bicycle crashes in Minneapolis are described a ...
  • LongTerm Bed Degradation in Maryland Streams Phase IV Western Shore of the Coastal Plain Province
    Long-Term Bed Degradation in Maryland Streams (Phase IV) : Western Shore of the Coastal Plain Province
    Parola, Arthur C. ;
    Oberholtzer, Ward L.
    2018-07-01 | PDF
    Estimation of potential long-term down-cutting of the stream bed is necessary for evaluation and design of bridges for scour and culverts for fish passage. The purpose of this study was to improve predictions of this potential long-term bed degradation (LTBD) in Maryland streams through the measurement and analysis of stream bed and water-way struc ...
    Supporting Files
  • Effect of Swellshrink Characteristics on Landslides in Yazoo Clay
    Effect of Swell-shrink Characteristics on Landslides in Yazoo Clay
    Khan, Sadik ;
    Ivoke, John
    2018-06-30 | PDF
    Slope failures are frequent in highway embankments as well as in waterway infrastructures (levees) on expansive Yazoo clay in Mississippi which cause significant maintenance problems and require millions of state and federal dollars to fix it. After construction, the strength of the high plastic clay degrades with time due to the seasonal temperatu ...
  • What Makes Travelers Use Ridehailing Exploring the Latent Constructs behind the Adoption and Frequency of Use of Ridehailing Services and Their Impacts on the Use of Other Travel Modes
    What Makes Travelers Use Ridehailing? Exploring the Latent Constructs behind the Adoption and Frequency of Use of Ridehailing Services, and Their Impacts on the Use of Other Travel Modes
    Alemi, Farzad
    ORCID ICON IMG
    2018-06-30 | PDF
    In this dissertation, the author investigated the factors affecting the adoption and frequency of ridehailing services and the impacts that these services have on different components of travel behavior using California Millennials Dataset, a rich dataset collected in fall 2015 with a comprehensive online survey administered to a sample of 2400 Cal ...
  • The Road Environment and Urban Bicycling Psychophysiological and Behavioral Responses
    The Road Environment and Urban Bicycling: Psychophysiological and Behavioral Responses
    Fitch-Polse, Dillon Taylor
    ORCID ICON IMG
    2018-06-30 | PDF
    This dissertation is about bicycling as a mode of transportation. More specifically it is about how road environments influence perceptions of safety and attitudes about bicycling, and how policies aimed at changing the road environment might influence travel behavior more broadly. In this dissertation the researcher presents three distinct studies ...
  • Roadway Lightings Impact on Altering Soybean Growth Volume 2 LED versus HPS Color Spectral Impact
    Roadway Lighting’s Impact on Altering Soybean Growth, Volume 2 : LED versus HPS Color Spectral Impact
    Palmer, Mathew ;
    Gibbons, Ronald
    2018-06-30 | PDF
    The impact of roadway lighting on soybean plant growth and development, was measured in situ at three locations in the state of Illinois. These locations were situated in close proximity of each other for the purpose of evaluating whether there was a difference in the soy response to HPS roadway lighting, versus soy lit by a specific model of 4,000 ...
  • Integrating transit signal priority with adaptive signal control in a connected vehicle environment Phase 1 Final Report
    Integrating transit signal priority with adaptive signal control in a connected vehicle environment : Phase 1 Final Report
    Smith, Stephen F. ;
    Isukapati, Isaac
    2018-06-30 | PDF
    This project has taken significant steps toward the development and demonstration of a more effective approach to transit signal priority (TSP) than currently available systems, through integration of real-time adaptive signal control technology with dedicated short range communications (DSRC)-based detection of buses and communication of status in ...
  • Regional MapBased Analytical Platform for Statewide Highway Safety Performance Assessment
    Regional Map-Based Analytical Platform for Statewide Highway Safety Performance Assessment
    Hajbabaie, Ali ;
    Wang, Yinhai
    2018-06-30 | PDF
    This research extended models for predicting current crash counts by severity (CCS) by developing a two-stage regression model and a generalized nonlinear regression model for formulating a new method for identifying CCS-based hotspots. The hotspot identification (HSID) method is designed to improve the safety performance module of the Digital Road ...
  • Development of the Nebraska Department of Transportation Winter Severity Index
    Development of the Nebraska Department of Transportation Winter Severity Index
    Walker, Curtis L. ;
    Anderson, Mark R.
    2018-06-30 | PDF
    Adverse weather conditions are responsible for millions of vehicular crashes, thousands of vehicular deaths and billions of dollars in economic and congestion costs. Many transportation agencies utilize a performance or mobility metric to assess how well they are maintaining road access. This research focuses on the development of a winter severity ...
  • Runoff Water Quality From Highway Cut Slopes in Pyritic Rock Formations Characterization and Potential Treatment
    Runoff Water Quality From Highway Cut Slopes in Pyritic Rock Formations: Characterization and Potential Treatment
    Schwartz, John S ;
    Palomino, Angel
    2018-06-30 | PDF
    Road construction through pyritic (sulfidic) rock formations has the potential to cause episodic runoff acidification and impairment to aquatic biota when acid producing materials (APM) are exposed to precipitation. State highways departments (DOTs) across eastern United States in the Appalachia region have recognized the need to handle APM during ...
  • Knowledge of Effects of Different Mississippi Soil Deposits on Pavement Performance
    Knowledge of Effects of Different Mississippi Soil Deposits on Pavement Performance
    Sheffield, Richard H.
    2018-06-29 | PDF
    The Mississippi Department of Transportation is in the process of implementing the Mechanistic- Empirical Pavement Design procedure for designing rigid and flexible pavements. This implementation effort includes developing a manual, “Mississippi DOT Pavement ME Design User Input Guide.” The current draft manual will be enhanced with the addition of ...
  • Sidepath Application Criteria Development for Bicycle Use
    Sidepath Application Criteria Development for Bicycle Use
    Sanders, Rebecca ;
    Pritchard, Hannah
    2018-06-29 | PDF
    This project included a crash analysis, resident survey, the development of a practitioner guide titled “Sidepath Intersection and Crossing Treatment Guide,” (the Guide) and the development of educational materials for Michigan practitioners and residents. An in-depth crash analysis was performed to understand the impacts of design, land use, traff ...
  • Resilient Modulus Prediction Models of Unbound Materials for Nevada
    Resilient Modulus Prediction Models of Unbound Materials for Nevada
    Haj, Elie Y. ;
    Thavathurairaja, Jeyakaran
    2018-06-26 | PDF
    The American Association of State Highway and Transportation Officials (AASHTO) adopted the Mechanistic-Empirical Pavement Design Guide (MEPDG) as an interim pavement design standard in 2008. In 2015, the Nevada Department of Transportation (NDOT) implemented the MEPDG for the structural design of new and rehabilitated flexible pavements. The resil ...
  • PostFire Ground Treatments
    Post-Fire Ground Treatments
    Bareither, Christopher A ;
    Heyliger, Paul
    2018-06-26 | PDF
    The objective of this project was to assess the efficacy of post-fire ground treatment in mitigating erosion and runoff on soil slopes subjected to wildfires. This objective was achieved through physical slope-model experiments and discrete element method (DEM) modeling. The physical experiments were conducted on block soil samples collected from U ...
  • Implementation of a 3D Sensing Technology for Automated Pavement Data Collection in Connecticut
    Implementation of a 3-D Sensing Technology for Automated Pavement Data Collection in Connecticut
    Yut, Iliya ;
    Mahoney, James
    2018-06-25 | PDF
    This report summarizes research on the impact of replacing older ARAN equipment (2-D Strobe cameras, ultrasonic rut bar, and inertial profiler) by the newest 3-D laser technology (Pavemetric LCMS and RoLine sensors) on the accuracy and precision of pavement performance data collected by the Connecticut Department of Transportation (CTDOT). The main ...
  • Learning Traffic Flow Dynamics Using Random Fields
    Learning Traffic Flow Dynamics Using Random Fields
    Dilip, Deepthi Mary ;
    Lin, DianChao
    2018-06-22 | PDF
    This paper presents a mesoscopic stochastic model for the reconstruction of vehicle trajectories from data made available by subsets of (probe) vehicles. Long-range vehicle interactions are applied in a totally asymmetric simple exclusion process to capture information made available to connected and autonomous vehicles. The dynamics are represente ...
  • HMA Mixtures Containing Recycled Asphalt Shingles RAS Low Temperature and Fatigue Performance of PlantProduced Mixtures
    HMA Mixtures Containing Recycled Asphalt Shingles (RAS): Low Temperature and Fatigue Performance of Plant-Produced Mixtures
    Mogawer, Walaa S. ;
    Ashtiani, Milad Zokaei
    2018-06-21 | PDF
    In the paving industry, there is increased interest in using recycled materials like Recycled Asphalt Shingles (RAS) and Reclaimed Asphalt Pavements (RAP) due to the valuable asphalt binder contained within them. The major concern with using these materials is that the binder contained within is highly aged which could lead to reduced mixture durab ...
  • Unmanned Aircraft Systems An Overview of Strategies and Opportunities for Missouri
    Unmanned Aircraft Systems : An Overview of Strategies and Opportunities for Missouri
    Lercel, Damon ;
    Steckel, Richard
    2018-06-18 | PDF
    Many states have embraced Unmanned Aircraft Systems (UAS) and are actively utilizing the technology across a number of state and local agencies. A growing number of states’ Departments of Transportation (DOT) are leveraging innovative UAS technology to creatively improve safety and efficiency while saving money. Currently 35 state DOTs are explorin ...
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