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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 2221 - 2240 of 36151 results
  • Implementation of the AASHTO MechanisticEmpirical Design Guide AASHTOWare Pavement ME Design for Pavement Rehabilitation Technical Summary
    Implementation of the AASHTO Mechanistic-Empirical Design Guide (AASHTOWare Pavement ME Design) for Pavement Rehabilitation [Technical Summary]
    Islam, Shuvo ;
    Hossain, Mustaque
    2023-02-01 | PDF
    The AASHTOWare Pavement ME Design (PMED) is a novel design method for new and rehabilitated pavement designs based on mechanistic-empirical design principles. The design process includes several empirical models calibrated with pavement performance data from pavement sections throughout the United States. Improved accuracy of the design process req ...
  • NonTraffic Surveillance Fatality and Injury Statistics in NonTraffic Crashes 2016 to 2020 Revised Traffic Safety Facts
    Non-Traffic Surveillance: Fatality and Injury Statistics in Non-Traffic Crashes, 2016 to 2020 (Revised) [Traffic Safety Facts]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-02-01 | PDF
    Based on the Non-Traffic Surveillance (NTS) system, an estimated average of 2,449 people were killed each year in non-traffic motor vehicle crashes during the 5-year period from 2016 to 2020. About a third (35%) of those people killed were nonoccupants such as pedestrians and bicyclists. Additionally, on average, an estimated 86,920 people were inj ...
  • Development of Crash Modification Factors CMFs for Utah Intersections
    Development of Crash Modification Factors (CMFs) for Utah Intersections
    Gong, Yaobang ;
    Yang, Xianfeng Terry
    2023-02-01 | PDF
    This research project aims at developing state-specific CMFs at intersections in Utah to quantify the safety impact of the countermeasures. Considering the research needs, data availability, and suggestions from the Technical Advisory Committee, the CMFs of four left-turn-phasing-related treatments, namely converting both-roadway permissive to one- ...
  • Determining Optimal Traffic Opening Time Through Concrete Strength Monitoring Wireless Sensing
    Determining Optimal Traffic Opening Time Through Concrete Strength Monitoring: Wireless Sensing
    Kong, Zhihao ;
    Lu, Na
    2023-02-01 | PDF
    Construction and concrete production are time-sensitive and fast-paced; as such, it is crucial to monitor the in-place strength development of concrete structures in real-time. Existing concrete strength testing methods, such as the traditional hydraulic compression method specified by ASTM C 39 and the maturity method specified by ASTM C 1074, are ...
  • Integration of WeedSuppressive Bacteria with Herbicides to Reduce Exotic Annual Grasses and Wildfire Problems on ITD RightofWays
    Integration of Weed-Suppressive Bacteria with Herbicides to Reduce Exotic Annual Grasses and Wildfire Problems on ITD Right-of-Ways
    Lazarus, Brynne E ;
    Germino, Matthew J
    2023-02-01 | PDF
    Invasion by exotic-annual grasses such as cheatgrass is impacting semiarid rangelands and especially transportation corridors, where it causes increased wildfire and many other environmental issues. Methods of reducing exotic annual grasses and restoring native perennials are needed, particularly testing of their intended target or unintended, non- ...
  • Safety Evaluation of Permissive Flashing Yellow Arrows for LeftTurn Movements in Missouri
    Safety Evaluation of Permissive Flashing Yellow Arrows for Left-Turn Movements in Missouri
    Jones, Joseph G. ;
    Foster, Nick
    2023-02-01 | PDF
    With over a decade of crash data available since the beginning of flashing yellow arrow (FYA) use, MoDOT decided to objectively investigate the safety performance of the system. Additionally, they wished to have an accurate inventory of all FYA installations statewide, and a determination of the benefit-cost ratio of the signal system. A virtual su ...
  • Guidelines for Incorporation of Cement Stabilized Reclaimed Base CSRB in Pavement Design
    Guidelines for Incorporation of Cement Stabilized Reclaimed Base (CSRB) in Pavement Design
    Kwon, Jayhyun ;
    Seo, Youngguk
    2023-02-01 | PDF
    GDOT is in the process of implementing an updated Mechanistic-Empirical Pavement Design Guide (MEPDG). To support this implementation, a research study was conducted to calibrate the national performance models for local conditions. However, reliable calibration coefficients could not be derived for semi-rigid pavements due to the lack of sufficien ...
  • Field Demonstration of an Innovative Box Beam Connection
    Field Demonstration of an Innovative Box Beam Connection
    Liu, Zhengyu ;
    Dahlberg, Justin
    2023-02-01 | PDF
    The objective of this project was to demonstrate the field implementation of an innovative longitudinal joint design developed during a previous phase of research. To achieve this objective, a yet-to-be-constructed box girder bridge in Washington County, Iowa, was selected to demonstrate the construction and performance of the joint. In order to ev ...
  • Minimum Intersection Illumination
    Minimum Intersection Illumination
    Hassan, Hany ;
    Abdu Kunnah, Hisham
    2023-02-01 | PDF
    Numerous prior studies indicated that street lighting improves nighttime traffic safety. However, lighting at unsignalized intersections (e.g., stop-controlled intersections and roundabouts) is not mandatory in some states such as Louisiana. This study aimed to examine whether Louisiana has traffic safety problems due to lack of lighting at its rur ...
  • Eastern Massasauga Rattlesnake Ohio Population Survey and Survey Technique Development Fact Sheet
    Eastern Massasauga Rattlesnake: Ohio Population Survey and Survey Technique Development [Fact Sheet]
    Peterman, William ;
    Lipps, Gregory
    2023-02-01 | PDF
    Eastern Massasaugas (Sistrurus catenatus) endangered in Ohio and federally threatened. Current approved survey methods involve corrugated tin surveys supplemented by visual encounter surveys. While effective, these traditional methods have low detection rates and require intensive field effort which can complicate environmental reviews of project i ...
  • The Future of Working Away from Work and Daily Travel A Research Synthesis
    The Future of Working Away from Work and Daily Travel: A Research Synthesis
    Speroni, Samuel ;
    Taylor, Brian D.
    2023-02-01 | PDF
    This research synthesizes literature on the relationship between working from home and travel. This relationship is a pertinent one because transportation planners and policymakers have long hoped that increased remote work, sometimes called telecommuting or telework, will reduce driving, traffic congestion, and vehicle emissions. This question is ...
  • Best Practices for Maintenance of Control Access Fencing Project Capsule
    Best Practices for Maintenance of Control Access Fencing [Project Capsule]
    Moomen, Milhan
    ORCID ICON IMG
    2023-02-01 | PDF
    The objectives of this project are to: (1) determine the best maintenance practices of access control fencing; (2) develop an informational guide for access control fencing maintenance that may aid in updating existing fencing policy; and (3) determine alternative fencing and other practices to lower maintenance costs.
  • The Economic and Societal Impact of Motor Vehicle Crashes 2019 Revised
    The Economic and Societal Impact of Motor Vehicle Crashes, 2019 (Revised)
    Blincoe, Lawrence J. ;
    Miller, Ted R
    2023-02-01 | PDF
    In 2019 there were 36,500 people killed, 4.5 million people injured, and 23 million vehicles damaged in motor vehicle crashes in the United States. The economic costs of these crashes totaled $340 billion, including lost productivity, medical, legal and court costs, emergency service, insurance administration, congestion, property damage, and workp ...
  • Use of Hot Water Pressure Wash Surface Preparation and HRCSA Coatings in Bridge Maintenance
    Use of Hot Water Pressure Wash Surface Preparation and HRCSA Coatings in Bridge Maintenance
    Qi, Xiaoning
    2023-02-01 | PDF
    In this Transportation Research Synthesis (TRS), state-of-the-art practice of highway bridge maintenance painting using high-ratio calcium sulfonate alkyd (HRCSA) and hot water pressure wash (HWPW) is reviewed and different state DOTs are surveyed. In summary, low-toxic HRCSA causes less pollution, eliminates waiting time between layers of coatings ...
  • Eastern Massasauga Rattlesnake Ohio Population Survey and Survey Technique Development
    Eastern Massasauga Rattlesnake: Ohio Population Survey and Survey Technique Development
    Hoffman, Andrew ;
    Amber, Evan
    2023-02-01 | PDF
    The Eastern Massasauga Rattlesnake (Sistrurus catenatus; EMR) has declined through most of its range and is endangered in Ohio and federally threatened. Areas that EMR may inhabit must be surveyed prior to approving development projects. Therefore, comprehensive, fast, and affordable survey techniques for the EMR are of interest to government and n ...
  • Criteria and Guidelines for ThreeLane Road Design and Operation
    Criteria and Guidelines for Three-Lane Road Design and Operation
    Davis, Gary A. ;
    Hourdos, John
    2023-02-01 | PDF
    A 4-3 conversion involves changing a four-lane undivided road into one with two general travel lanes separated by a two-way left turn lane. A commonly-used guideline states that a 4-3 conversion can be considering as long as the road’s average annual daily traffic (AADT) volume does not exceed 15,000 vehicles/day but opinions vary, from lowering th ...
  • Implementation of the AASHTO MechanisticEmpirical Design Guide AASHTOWare Pavement ME Design for Pavement Rehabilitation
    Implementation of the AASHTO Mechanistic-Empirical Design Guide (AASHTOWare Pavement ME Design) for Pavement Rehabilitation
    Islam, Shuvo ;
    Hossain, Mustaque
    2023-02-01 | PDF
    The AASHTOWare Pavement ME Design (PMED) is a novel design method for new and rehabilitated pavement designs based on mechanistic-empirical design principles. The design process includes several empirical models calibrated with pavement performance data from pavement sections throughout the United States. Improved accuracy of the design process req ...
  • Riprap Filters and Stability of RiprapCovered Slopes Technical Report
    Riprap Filters and Stability of Riprap-Covered Slopes: Technical Report
    Sfeir, Jerome ;
    Briaud, Jean-Louis
    2023-02-01 | PDF
    This research report documents the outcome of a study performed on riprap filters (granular and geosynthetic) and the stability of riprap-covered slopes. Erosion of the underlying soil through the riprap is likely to happen if there is a sufficient gap in grain size between the soil and the riprap. This gap is often the case, which is why a filter ...
  • Investigating Project Bundling Practices for Transportation Construction Projects
    Investigating Project Bundling Practices for Transportation Construction Projects
    Shan, Yongwei ;
    Shrestha, Saurav
    2023-02-01 | PDF
    Project Bundling is an innovative contract procurement strategy that is being widely used in bridge and highway projects to save project delivery time and costs. The guidebook developed by FHWA on project bundling also provides a wealth of information on project bundling. However, the guidebook is primarily focused on the project bundling practices ...
  • Domestic Airline Fares Consumer Report Third Quarter 2022 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: Third Quarter 2022 Passenger and Fare Information
    United States. Department of Transportation
    2023-02-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
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