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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 3761 - 3780 of 36011 results
  • Supplementary Cementitious Materials Assessment of Test Methods for New and Blended Materials
    Supplementary Cementitious Materials: Assessment of Test Methods for New and Blended Materials
    Al-Shmaisani, Saif ;
    Kalina, Ryan
    2021-03-01 | PDF
    In Texas, and most of the U.S., Class F fly ash is the most used supplementary cementitious material (SCM) due to the many benefits it provides to concrete. In recent years, the availability of Class F fly ash has decreased as many coal-fired power plants have shut down. Plants that have not shut down are required to install various emission contro ...
  • Surface Transportation Supply Chain Security Creating a Blueprint for Future Research
    Surface Transportation Supply Chain Security: Creating a Blueprint for Future Research
    Edwards, Frances ;
    Szyliowicz, Joseph
    2021-03-01 | PDF
    Ninety percent of the world’s trade goods travel by surface transportation, using maritime, road and rail assets. The security of the goods in transit, the infrastructure supporting the movement, and the vehicles, are required to ensure that international commerce proceeds successfully. Much has been written about the surface supply chain itself, b ...
  • Remote Sensing Direct Measurement Mandrel for Use in Pipes Division of Engineering Research OnCall Services Task 4
    Remote Sensing Direct Measurement Mandrel for Use in Pipes: Division of Engineering Research On-Call Services Task 4
    Khoury, Issam ;
    Wilhelm, Jay
    2021-03-01 | PDF
    The objective of this project was to develop a low-cost Remote Sensing Direct Measurement Mandrel (RSDMM) that can measure the internal in-situ diameter of buried flexible pipe with diameter ranging from 24 in (610 mm) to 48 in (1220 mm). This was achieved by modifying the ODOT Turtle Rover to include a LiDAR and forward-facing camera all controlle ...
  • Division of Engineering Research on Call ROC Task 9 Exterior Protection of Precast Reinforced Concrete Culverts
    Division of Engineering Research on Call (ROC) Task #9 – Exterior Protection of Precast Reinforced Concrete Culverts
    Sezen, Halil ;
    Kasapoglu, Baris
    2021-03-01 | PDF
    Application of exterior coatings and membrane waterproofing on precast reinforced concrete box culverts, three-sided flat-topped culverts, and precast reinforced concrete arch and round sections is required by Ohio Department of Transportation (ODOT). Sealing and waterproofing limit the intrusion of ground water through the top of the joint and it ...
  • Update to Methodology for Setting Speed Limits in Urban Areas
    Update to Methodology for Setting Speed Limits in Urban Areas
    Figliozzi, Miguel G ;
    Unnikrishnan, Avinash
    2021-03-01 | PDF
    Many cities in Oregon are requesting a comprehensive review of speed zoning guidelines and existing procedures for streets with high volumes of active travelers. The main goal of this research is to develop recommendations for alternate criteria for setting speed zones on roadways with a high percentage of active travelers. Literature pertaining to ...
  • Congestion Reduction via Personalized Incentives
    Congestion Reduction via Personalized Incentives
    Ghafelebashi, Ali ;
    Razaviyayn, Meisam
    2021-03-01 | PDF
    With rapid population growth and urban development, traffic congestion has become an inescapable issue, especially in large cities. Many congestion reduction strategies have been proposed in the past, ranging from roadway extension to transportation demand management programs. In particular, congestion pricing schemes have been used as negative rei ...
  • Spatial Analysis of Benefits of SiteSpecific Ground Motion Response Analysis
    Spatial Analysis of Benefits of Site-Specific Ground Motion Response Analysis
    Elsayed, Ashraf ;
    Pezeshk, Shahram
    2021-03-01 | PDF
    The general procedure of the American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge Design Specifications, or AASHTO Guide Specifications for Load and Resistance Factor Design (LRFD) Seismic Bridge Design is sufficient to determine seismic hazard and site response. However, it is appropriate and may be necessary to ...
  • Spill Behavior Detection and Mitigation for Emerging Nontraditional Marine Fuels
    Spill Behavior, Detection, and Mitigation for Emerging Nontraditional Marine Fuels
    Kass, Michael D ;
    Sluder, C Scott
    2021-03-01 | PDF
    The topic of the research is the predicted impact of large spills or releases of alternative marine fuels. The fuels covered are those that have been identified as potential future fuels for the marine shipping sector by industry experts and government agencies overseeing the development of renewable and low-carbon fuels. Several of these fuels are ...
  • A Comprehensive Literature Review Detailing the Methods for Setting Speed Limits in Urban Areas
    A Comprehensive Literature Review Detailing the Methods for Setting Speed Limits in Urban Areas
    Figliozzi, Miguel ;
    Unnikrishnan, Avinash
    2021-03-01 | PDF
    Many cities in Oregon are requesting a comprehensive review of speed zoning guidelines and existing procedures for streets with high volumes of active travelers. Cities are proposing alternative speed zoning guidelines that are starkly different from existing guidelines based on the 85th percentile speed distribution. The alternative guidelines and ...
  • Use of Material Delivery Management System MDMS for Asphalt Paving Applications
    Use of Material Delivery Management System (MDMS) for Asphalt Paving Applications
    Embacher, Rebecca
    2021-03-01 | PDF
    Each year, the Minnesota Department of Transportation (MnDOT) is affected by the large volume of data produced each day on highway construction projects. Significant time and resources are spent toward proper documentation, organization, mining, and review and use of this information. Intelligent construction technologies (ICT) are continuously bei ...
  • HFST Before and After Safety Analysis
    HFST Before and After Safety Analysis
    Bledsoe, Jay F ;
    Lee, Hyung S
    2021-03-01 | PDF
    Due to its high potential for safety improvement, MoDOT deployed High Friction Surface Treatments (HFST) at several areas experiencing high crash rates since 2013. To determine if the HFSTs are providing the expected results and if MoDOT’s HFST program is effective, this study was conducted with the primary objective of evaluating MoDOT’s existing ...
  • Evaluating the Safety Impacts of Flashing Yellow Permissive LeftTurn Indications in Massachusetts
    Evaluating the Safety Impacts of Flashing Yellow Permissive Left-Turn Indications in Massachusetts
    Tainter, Francis ;
    Fitzpatrick, Cole
    2021-03-01 | PDF
    The 2009 edition of the Manual on Uniform Traffic Control Devices (MUTCD) introduced the flashing yellow arrow (FYA) as a permissive left-turn indication. Massachusetts recently implemented this novel traffic control device through a statewide retrofitting project at over 350 traditional protected-permissive left-turn traffic signals. A before/afte ...
  • Impact of Center Line Rumble Strips and Shoulder Rumble Strips on all Roadway Departure Crashes in Louisiana Twolane Highways
    Impact of Center Line Rumble Strips and Shoulder Rumble Strips on all Roadway Departure Crashes in Louisiana Two-lane Highways
    Sun, Xiaoduan ;
    Rahman, M Ashifur
    2021-03-01 | PDF
    To prevent roadway departure crashes, rumble strips have been installed on Louisiana’s two-lane highways. This study investigated the impact of rumble strips on 1,593.09 miles of two-lane highways in Louisiana, on which centerline rumble strips (CLRS) and shoulder rumble strips (SRS) were installed between years 2010 and 2016. The comprehensive eva ...
  • Assessment of Prospective MileageBased Fee System to Replace Fuel Taxes for Passenger Vehicles in Pennsylvania
    Assessment of Prospective Mileage-Based Fee System to Replace Fuel Taxes for Passenger Vehicles in Pennsylvania
    Matthews, H Scott ;
    Fischbeck, Paul S
    2021-03-01 | PDF
    In this proof-of-concept for Pennsylvania, the authors leverage about 120 million records from annual vehicle inspections across a fifteen-year period, to develop high-resolution estimates of annual vehicle miles travelled (VMT) per vehicle aggregated at the state, county, and ZIP code level. Web scraping was used to assess the fuel economy of each ...
  • Balanced Mixture Design Implementation Support
    Balanced Mixture Design Implementation Support
    West, Randy ;
    Yin, Fan
    2021-03-01 | PDF
    This project sought to evaluate performance-based methodologies for asphalt mix design and develop a preliminary balanced mix design (BMD) specification for the Wisconsin Department of Transportation (WisDOT) projects. The work plan included conducting a literature review, interviewing Wisconsin mix designers, conducting a BMD workshop, benchmarkin ...
  • Adaptive Management To Improve DeIcing Operations
    Adaptive Management To Improve De-Icing Operations
    Baker, Lawrence A ;
    Wilson, Brue
    2021-03-01 | PDF
    Road de-icing is a major cause of chloride impairment in Minnesota’s urban waters. The goal of our study was to develop an adaptive management (AM) strategy to reduce chloride impacts caused by de-icing operations. The AM process was informed by our analysis of chloride movement in a residential watershed, providing feedback to the street departmen ...
    Supporting Files
  • Implementation of a Protocol for Acceptance of New OverCoating Systems for Steel Surfaces
    Implementation of a Protocol for Acceptance of New Over-Coating Systems for Steel Surfaces
    Balaguru, Perumalsamy ;
    Roy, Sougata
    2021-03-01 | PDF
    This project was undertaken to develop a procedure to accept new coating systems for over-coating of steel surfaces and the results are presented in three parts. Section I and Section II covers acceptance procedure and details of information needed based on accelerated corrosion test. Section III presents a model for predicting field service life u ...
  • Analysis of Speed Profiles and Evaluation of Dynamic Signs in Kansas Work Zones
    Analysis of Speed Profiles and Evaluation of Dynamic Signs in Kansas Work Zones
    Cunningham IV, Jack R ;
    Anderson, Samantha M
    2021-03-01 | PDF
    Work zones are essential for maintaining and improving roadways in the United States. Although reduced speed limits are used throughout work zones to increase worker and driver safety, motorists often do not obey these speed limits. From 2016 to 2017, 799 work zone fatalities occurred, an increase of 3%, with vehicle speed as a main contributing fa ...
  • Workforce Planning and Human Resource Development Strategies for Minnesotas Public Transportation Agencies
    Workforce Planning and Human Resource Development Strategies for Minnesota’s Public Transportation Agencies
    Bartlett, Kenneth ;
    Collins, Joshua
    2021-03-01 | PDF
    This study explored and examined possible causes of the workforce shortage in Minnesota’s transportation industry. Appropriate human resource strategies were proposed in response. Four interrelated approaches were undertaken: 1) a literature review, 2) a questionnaire, 3) audio interviews, and 4) integration of data to generate recommendations for ...
  • Informing New ADOT Strategies for Meeting Federal DBE Requirements
    Informing New ADOT Strategies for Meeting Federal DBE Requirements
    Pryor, Debra ;
    Meyers, Deborah
    2021-03-01 | PDF
    As a recipient of US Department of Transportation funding, the Arizona Department of Transportation (ADOT) is required to administer a disadvantaged business enterprise (DBE) program aimed at providing DBEs fair opportunities to compete for federally funded transportation contracts. State departments of transportation (DOTs) are required to set an ...
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