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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 6021 - 6040 of 36049 results
  • Performance Improvement of High Early Strength HES Concrete for Pavement Replacement Slabs Summary
    Performance Improvement of High Early Strength (HES) Concrete for Pavement Replacement Slabs [Summary]
    Zayed, A
    2019-03-01 | PDF
    University of South Florida identified concrete mixtures and slab base-restraint and placement conditions that can reduce the risk of early-age cracking in concrete pavement repair slabs.
  • GISBased Plume Data Web Portal
    GIS-Based Plume Data Web Portal
    Graettinger, Andrew J. ;
    Smith, Randy K.
    2019-03-01 | PDF
    A GIS-based online portal was developed to store, analyze, and display data from multiple sources pertinent to the ALDOT Coliseum Boulevard site in Montgomery Alabama. These sources comprise various consultants involved with the site including geotechnical companies, water testing labs, law firms, and management personnel from ALDOT/ADEM. The goal ...
  • Implementation of Unmanned Aerial Systems Using CloseRange Photogrammetry Techniques UASCRP for Quantitative Metric and Qualitative Inspection Tasks Related to Roadway Assets and Infrastructure Project Summary
    Implementation of Unmanned Aerial Systems Using Close-Range Photogrammetry Techniques (UAS-CRP) for Quantitative (Metric) and Qualitative (Inspection) Tasks Related to Roadway Assets and Infrastructure [Project Summary]
    Puppala, Anand J. ;
    Congress, Surya S C
    2019-02-28 | PDF
    One of the main objectives of this implementation project was to validate the TxDOT Unmanned Aircraft Systems (UAS) Flight Operations and User’s Manual (FOM) that was developed as part of the research project 0-6944. After the research project was successfully completed, TxDOT granted this implementation project that included nine training sessions ...
  • 20072016 Fatal Traffic Crashes in Alaska Hawaii Idaho and Washington and Characteristics of Traffic Fatalities Involving Hawaiians and CSET Minorities
    2007–2016 Fatal Traffic Crashes in Alaska, Hawaii, Idaho, and Washington and Characteristics of Traffic Fatalities Involving Hawaiians and CSET Minorities
    Prevedouros, Panos D ;
    Bhatta, Kishor
    2019-02-28 | PDF
    Data for this comparative study were collected from the Fatality Analysis and Reporting System (FARS) for the years 2007 to 2016 for the states of Alaska, Hawaii, Idaho, and Washington. The rates of roadway fatalities, especially those of American Indians (which include Aleuts and Eskimos), Guamanians, Samoans, and Native Hawaiians (which include p ...
  • Enhancing Curve Advisory Speed and Curve Safety Assessment Practices Project Summary
    Enhancing Curve Advisory Speed and Curve Safety Assessment Practices [Project Summary]
    Pratt, Michael P. ;
    Geedipally, Srinivas
    2019-02-28 | PDF
    The Texas Department of Transportation (TxDOT) is in the process of conducting several parallel efforts to evaluate rural highway horizontal curves. Following the adoption of the 2011 Texas Manual on Uniform Traffic Control Devices, district personnel are checking and updating posted curve advisory speeds and other curve traffic control devices (e. ...
  • Communications and RadarSupported Transportation Operations and Planning CARSTOP Phase 2 Project Summary
    Communications and Radar-Supported Transportation Operations and Planning (CAR-STOP) [Phase 2 Project Summary]
    Jensen, Darrin ;
    Bhat, Chandra R.
    2019-02-28 | PDF
    A recent report from the National Highway Traffic Safety Administration indicates that more than 80% of all annual car crashes could be prevented by vehicular communications. To that end, the focus of this project was to develop a framework (conceptualizations, processes, procedures, and algorithms) to harness and mature sensing and communication t ...
  • Noncontact Splices at Drilled Shaft to Bridge Column Interface Project Summary
    Non-contact Splices at Drilled Shaft to Bridge Column Interface [Project Summary]
    Mo, Yi-Lung ;
    Masud, Mahadi
    2019-02-28 | PDF
    This research project conducted an experimental and analytical investigation on the behavior of non-contact lap splices at geometrically dissimilar bridge column to drilled shaft connections with regards to non-contact lap splice distance, lap splice length, and amount of transverse reinforcement in the non-contact lap splice zone. Design provision ...
  • To Trust or Not to Trust? A Simulation-Based Experimental Paradigm [supporting datasets]
    Knodler Jr., Michael A. ;
    Christofa, Eleni
    2019-02-26 | ZIP
    The automated driving system is expected to enhance traffic safety and flow; however, the system will not be as effective if users do not accept it or do not utilize it appropriately [1]. Appropriate acceptance and use of technology depends on attributes such as perceived risk, mental workload, self-confidence, and appropriate level of trust that m ...
    Dataset
  • 2018 Census of California Water Transit Services
    2018 Census of California Water Transit Services
    Kos, Richard M. ;
    Frey, Nicholas
    2019-02-26 | PDF
    The U.S. Bureau of Transportation Statistics conducts a nationwide census of ferry boat operators for the U.S. Department of Transportation and the collected information is used for statistical purposes. The Caltrans Division of Local Assistance has been asked by the Federal Highway Administration (FHWA) to gather data regarding ferry operations un ...
  • Assessment of the HAWK Crosswalk Traffic Signal
    Assessment of the HAWK Crosswalk Traffic Signal
    Anderson, Ian A.
    ORCID ICON IMG
    2019-02-20 | PDF
    The Pedestrian Hybrid Beacon (PHB) Crosswalk is a type of traffic control system, used to aid pedestrians safely crossing the street and to regulate traffic flow. This study examined the success of the first PHB installed in the state of Vermont. The project location in Colchester, VT, is an area noted for its high traffic flow, as it connects the ...
  • ReinforcementLearningBased Cooperative Adaptive Cruise Control of Buses in the Lincoln Tunnel Corridor With TimeVarying Topology
    Reinforcement-Learning-Based Cooperative Adaptive Cruise Control of Buses in the Lincoln Tunnel Corridor With Time-Varying Topology
    Gao, Weinan ;
    Gao, Jingqin
    2019-02-20 | PDF
    The exclusive bus lane (XBL) is one of the most popular bus transit systems in US. The Lincoln Tunnel utilizes an XBL through the tunnel in the AM peak period. This paper proposes a novel data-driven cooperative adaptive cruise control (CACC) algorithm that aims to minimize a cost function for connected and autonomous buses along the XBL. Different ...
  • Deep Learning-based Eco-driving System for Battery Electric Vehicles [supporting datasets]
    Wu, Guoyuan ;
    Ye, Fei
    2019-02-19 | ZIP
    Eco-driving strategies based on connected and automated vehicles (CAV) technology, such as Eco-Approach and Departure (EAD), have attracted significant worldwide interest due to their potential to save energy and reduce tail-pipe emissions. In this project, the research team developed and tested a deep learning–based trajectory-planning algorithm ( ...
    Dataset
  • Use of Nevadas Natural Pozzolans to Mitigate AlkaliSilica Reactivity
    Use of Nevada’s Natural Pozzolans to Mitigate Alkali-Silica Reactivity
    Ghafoori, Nader ;
    Kian, Arash
    2019-02-18 | PDF
    The aim of this study was (i) to assess the extent of reactivity of the aggregates, quarried from seven different sources, suspected of being conducive to ASR, and (ii) to compare the effectiveness of industrial (Class F fly ash) and natural pozzolans in mitigation of alkali-silica reactivity of the studied aggregates. To this end, seven aggregate ...
  • Smart Sensors for Integration into Transportation Systems
    Smart Sensors for Integration into Transportation Systems
    Chintalapalle, Ramana ;
    Bandi, Mallesham
    2019-02-15 | PDF
    Doped perovskite materials exhibiting temperature independent conductivity has gained enormous attention for high temperature oxygen sensors due to great advantage over traditional doped metal oxides. This report focused on effect of sintering temperature on structure, morphology to explore correlation between oxygen sensing response of Ba(Fe₀.₇Ta₀ ...
  • Identifying Sensitive Structural and Hydraulic Parameters in a BridgeStream Network Under Flood Conditions
    Identifying Sensitive Structural and Hydraulic Parameters in a Bridge-Stream Network Under Flood Conditions
    Trueheart, Matthew ;
    Bomblies, Arne
    2019-02-08 | PDF
    The interactions between rivers, surrounding hydrogeological features, and hydraulic structures such as bridges are not well-established or understood at the network scale, especially under transient conditions. The cascading effects of local perturbations up- and downstream of hydraulic structures may have significant and far-reaching consequences ...
  • Maintenance of Roadway Edge DropOff Utilizing Readily Available Materials Project Capsule
    Maintenance of Roadway Edge Drop-Off Utilizing Readily Available Materials [Project Capsule]
    Gautreau, Gavin P. ;
    Rupnow, Tyson
    2019-02-03 | PDF
    The Louisiana Department of Transportation and Development (DOTD) District 05 (in the northeastern corner of the state) spent 55,000 manhours and over $1 million in 2016 attempting to maintain roadway edges along nonpaved shoulders.
  • Economic Development Impact of Preservation Projects
    Economic Development Impact of Preservation Projects
    Ke, Yue ;
    Losada-Rojas, Lisa Lorena
    2019-02-01 | PDF
    Preservation and maintenance activities protect pavements and bridges, extending the life of these assets and guarantee the safety of users. Because rebuilding a road in poor condition can cost ten times as much as work needed to keep the road in good condition, these activities also represent significant savings to taxpayers. In addition to these ...
  • Implementation of Optimal Parameter Settings in GDOTs Current Ramp Metering Operation
    Implementation of Optimal Parameter Settings in GDOT’s Current Ramp Metering Operation
    Laval, Jorge A. ;
    Guin, Angshuman
    2019-02-01 | PDF
    The objective of this study is to optimize the parameter settings for the local ramp metering control system currently in operation in the Metro Atlanta freeway network. The study corridor is Eastbound/Southbound I-285 between GA 400 and I-20. Using a stochastic simulation-based optimization framework that combines microsimulation model GTsim and a ...
  • Synthesis on Rapid Repair Methods for Embankment Slope Failure Final Report
    Synthesis on Rapid Repair Methods for Embankment Slope Failure: Final Report
    Shahandashti, Mohsen ;
    Hossain, Sahadat
    2019-02-01 | PDF
    Although the majority of slope repairs using common repair approaches show a satisfactory performance, some repair attempts have shown a recurring failure after a period of time. Recurring slope failures happen frequently in Texas, due to the extreme weather and soil conditions. The Texas Department of Transportation (TxDOT) annually spends million ...
  • Prevention of Backing Fatalities in Construction Work Zones Final Report
    Prevention of Backing Fatalities in Construction Work Zones: Final Report
    Fan, Wei ;
    Carroll, Clayton
    2019-02-01 | PDF
    Construction, repair, and maintenance work zones are always hazardous environments, particularly given the dangerous combinations of pedestrian workers and large trucks, bulldozers, rollers, and other moving machinery. Workers are exposed to moving traffic near the work zone with the risk of errant vehicles entering the work zone area. Pedestrian w ...
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