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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 4701 - 4720 of 36908 results
  • Guidance for Installation of Midwest Guardrail System Adjacent to Slopes
    Guidance for Installation of Midwest Guardrail System Adjacent to Slopes
    Bielenberg, Robert W. ;
    Kohtz, Justine E.
    2020-09-29 | PDF
    The report provides general guidance for the installation of the Midwest Guardrail System (MGS) adjacent to slopes. Previous full-scale crash testing of W-beam guardrail adjacent to or on slopes and relevant dynamic bogie testing of posts on or adjacent to slopes was reviewed. Based on that review, general guidance for the use of the MGS with slope ...
  • Railroad Engineering Education Outreach
    Railroad Engineering Education & Outreach
    Schlake, Bryan W ;
    Shen, Shihui
    2020-09-28 | PDF
    Due to high levels of attrition, the railroad industry is in need of trained engineering students who are qualified to fill professional and management roles for railroad, consulting, and supply companies. Penn State Altoona offers the nation’s only four-year Bachelor of Science degree in Rail Transportation Engineering. While this program is growi ...
  • Impacts of Transportation Emissions on the Risk of Mortality Findings From the Literature and Policy Implications
    Impacts of Transportation Emissions on the Risk of Mortality: Findings From the Literature and Policy Implications
    Nadafianshahamabadi, Razieh ;
    Tayarani, Mohammad
    2020-09-17 | PDF
    Background: Exposure to vehicle emissions have been considered a cause of several negative health outcomes including mortality. The existing findings are too inconsistent to drive a well-founded exposure-response function to be fully exploited to curb the negative impacts of transportation systems on public health. In this study, we investigate the ...
  • Discovering Potential Market for the Integration of Public Transportation and Emerging Shared Mobility Services [supporting datasets]
    Du, Lili ;
    Qiu, Jiahua
    2020-09-17 | PDF
    This project conducted a comprehensive data analysis to answer two questions: 1) Who are the potential demands with high probability to use intermodal services provided by hybrid systems? (Task 1); 2) Where and when are the supply gaps to coordinate public transit services with shared-mobility service? (Task 2). To accomplish these research objecti ...
    Dataset Supporting Files
  • A Moment in Time Senator Al Gore Holds a Hearing
    A Moment in Time: Senator Al Gore Holds a Hearing
    Weingroff, Richard F.
    2020-09-16 | FHWA Highway History Website Articles | PDF
    President Dwight D. Eisenhower is often called the Father of the Interstate System, which since 1990 has been named after him: the Dwight D. Eisenhower National System of Interstate and Defense Highways. He made the program a high priority, worked behind the scenes and in public to promote it, followed its progress during his second term in the Whi ...
  • Feasibility and Implementation of Balanced Mix Design in Nebraska
    Feasibility and Implementation of Balanced Mix Design in Nebraska
    Nsengiyumva, Gabriel Mukristu ;
    Kim, Yong-Rak
    2020-09-15 | PDF
    Balanced mixture design is an alternative asphalt concrete design method that incorporates the performance of mixtures during the design. Balanced mixture design consists of performance test methods and performance criteria. Compared to the existing Superpave design method which mostly relies on volumetrics to design mixtures, balanced mixture desi ...
  • Evaluation of Mixtures and Pavement Performance for Rehabilitation Methods
    Evaluation of Mixtures and Pavement Performance for Rehabilitation Methods
    Rahmani, Mohammad ;
    Nsengiyumva, Gabriel
    2020-09-15 | PDF
    Pavement rehabilitation practice involves milling an asphalt surface and placing a new layer. The incorporation of reclaimed asphalt pavement (RAP) mixtures brings cost savings and preserves the environment and natural resources. However, the use of recycled materials can compromise pavement performance, in particular, RAP can contribute to crackin ...
  • Documenting the Characteristics of Traffic Crashes for RITI Communities in Idaho
    Documenting the Characteristics of Traffic Crashes for RITI Communities in Idaho
    Abdel-Rahim, Ahmed ;
    Swoboda-Colberg, Skye
    2020-09-03 | PDF
    This project documents the characteristics of traffic crashes in rural, isolated, tribal, and indigenous (RITI) communities in Idaho and establishes an in-depth understanding of the baseline traffic safety conditions in RITI communities. Different sources of crash data for RITI communities in Idaho was used to conduct an in-depth ten-year crash ana ...
  • Development and Testing of a Bridge Rail for LowVolume Roads
    Development and Testing of a Bridge Rail for Low-Volume Roads
    Rosenbaugh, Scott K. ;
    DeLone, Jacob A
    2020-09-03 | PDF
    A new steel bridge rail was developed for use on low-volume bridges. The railing consisted 31-in. tall, 12-gauge W-beam guardrail mounted on S3x5.7 posts, which were supported by steel square-tube sockets attached to the side of the bridge deck. The sockets were to be attached to the steel C-channel that is typically placed along the edges of rural ...
  • Is the Transit Industry Prepared for the Cyber Revolution Policy Recommendations to Enhance Surface Transit Cyber Preparedness
    Is the Transit Industry Prepared for the Cyber Revolution? Policy Recommendations to Enhance Surface Transit Cyber Preparedness
    Belcher, Scott ;
    Belcher, Terri
    2020-09-01 | PDF
    The intent of this study is to assess the readiness, resourcing, and structure of public transit agencies to identify, protect from, detect, respond to, and recover from cybersecurity vulnerabilities and threats. Given the multitude of connected devices already in use by the transit industry and the vast amount of data generated (with more coming o ...
  • Summary of Illinois Regulations and Review of Treatment Alternatives for Contaminated Soils in RightofWays
    Summary of Illinois Regulations and Review of Treatment Alternatives for Contaminated Soils in Right-of-Ways
    Hohner, Amanda K. ;
    Pelletier, Austin
    2020-09-01 | PDF
    Industrial activities and vehicular transportation often pollute roadside soils with toxic mixtures of petroleum derivatives, combustion byproducts, and metal contaminants. Of these contaminants, semi-volatile organic compounds and metallic inorganics are commonly present at levels exceeding regulatory limits and require special handling if found i ...
  • Internal Friction Angle of Sands With High Fines Content Research Project Capsule 211GT
    Internal Friction Angle of Sands With High Fines Content: Research Project Capsule [21–1GT]
    Abu-Farsakh, Murad Y.
    2020-09-01 | PDF
    There are three main objectives of this study. The first is to evaluate the effect of fines content on the value of internal friction angle of sand soils mixed with fines typically encountered in Louisiana. The second objective is to evaluate the effect of fines content on the interface friction angle between sand soils mixed with fines and both co ...
  • Forecasting Bicycle Facility Demand
    Forecasting Bicycle Facility Demand
    Machemehl, Randy ;
    Hall, Jenny
    2020-09-01 | PDF
    The objective of this report is to (1) evaluate current and past predictive models that are used for forecasting off-street bicycle facility demand; (2) create a statistical model from locally sourced data that is able to connect bicycle facility counts to time, demographic data, and weather data; (3) conclude if the statistical model can be applie ...
  • Will RideHailing Enhance Mobility for Older Adults A California Survey
    Will Ride-Hailing Enhance Mobility for Older Adults? A California Survey
    Agrawal, Asha Weinstein ;
    Shirgaokar, Manish
    2020-09-01 | PDF
    Ride-hailing services such as Lyft and Uber offer a potential mobility option for the growing numbers of aging Californians who risk social and economic isolation if they cannot drive for health or financial reasons. They could also serve older adults who currently have mobility options but would prefer a ride-hailing alternative for at least some ...
  • The Role of Bus Stop Features in Facilitating Accessibility
    The Role of Bus Stop Features in Facilitating Accessibility
    Bartholomew, Keith ;
    Kim, Ja Young
    2020-09-01 | PDF
    Although transit decision-makers and riders generally favor improving bus stops by adding shelters, benches, and similar features, it is unclear the impact such features have on transit demand, and there has been little research that measures these impacts. This study examines the link between stop improvements and changes in stop-level boardings o ...
  • Implementing Revisions to the Allowable Maximum Recycled Binder Ratio RBR Specification
    Implementing Revisions to the Allowable Maximum Recycled Binder Ratio (RBR) Specification
    Filonzi, Angelo ;
    Lee, Sang Ki
    2020-09-01 | PDF
    An increase in the use of reclaimed asphalt pavement (RAP) in the design and construction of new roads must not come at the expense of reduced durability or life cycle cost of flexible pavements. In Texas, current mixture design specifications allow the use of a binder with lower high temperature grade in lieu of the specified binder when incorpora ...
  • Alkaliactivated Materials Environmental Preliminary Assessment for US Roadway Applications
    Alkali-activated Materials: Environmental Preliminary Assessment for U.S. Roadway Applications
    Kurtis, Kimberly E ;
    Lolli, Francesca
    2020-09-01 | PDF
    The capital investment in the U.S. for construction and maintenance of the infrastructure road network is on the order of $100 billion/year. On average, investments in Organization for Economic Cooperation and Development (OECD) countries are likely to stabilize, while China will face an exponential growth of investments for new infrastructures dri ...
  • Public InvolvementEducation on Alternative IntersectionInterchange Designs
    Public Involvement/Education on Alternative Intersection/Interchange Designs
    Rodgers, Michael O. ;
    Gbologah, Franklin
    2020-09-01 | PDF
    Given the recent introduction of many innovative designs, still relatively limited material exists that explains the concepts, tradeoffs, and benefits underlying such innovative intersection designs in a form accessible to the general public. This project was designed to both test the effectiveness of existing GDOT public information materials and ...
  • Phase III Smart Proximity Work Zone Safety Technology Deployment
    Phase III: Smart Proximity Work Zone Safety Technology Deployment
    Cho, Yong Kwon ;
    Kim, Kinam
    2020-09-01 | PDF
    The main objective of this research is to develop and deploy a low-cost and scalable smart Internet of Things(IoT) proximity alert system using the IoT mobile sensing technology for alerting workers and equipment operators in proximity hazard situations in highway work zones. This research consisted of 5 field tests, including a preliminary test an ...
  • Evaluation of the Effectiveness of Wildlife Guards and Right of Way Escape Mechanisms for Large Ungulates in Arizona
    Evaluation of the Effectiveness of Wildlife Guards and Right of Way Escape Mechanisms for Large Ungulates in Arizona
    Gagnon, Jeffrey W. ;
    Loberger, Chad D.
    2020-09-01 | PDF
    Wildlife-vehicle collisions (WVC) can cause motorist fatalities, injuries, and property damage to vehicles. To address safety concerns and reduce WVC in Arizona, the Arizona Department of Transportation (ADOT) has installed fencing in areas with high WVC incidence to limit ungulate access to the right of way (ROW) and to funnel animals to structure ...
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