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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 6181 - 6200 of 36049 results
  • Defining the HudsonBergen Light Rail Catchment Area
    Defining the Hudson-Bergen Light Rail Catchment Area
    Carnegie, Jon A. ;
    Deka, Devajyoti
    2019-01-01 | PDF
    The objective of this research study was to conduct a comprehensive onboard survey of Hudson Bergen Light Rail (HBLR) weekday riders and use the results of the survey and analysis of secondary data to identify the ridership catchment area of the HBLR system, in the context of its interaction with other transportation modes in the area. Analysis of ...
  • CPT Based Pile Design
    CPT Based Pile Design
    Song, Chung R. ;
    Kim, Seunghee
    2019-01-01 | PDF
    The geotechnical design of a pile foundation is concerned with the determination of the safe magnitude of an external load that the foundation can carry without jeopardizing the stability of the supported structure. In recent years, in-situ sounding tests are becoming a more attractive method to predict pile capacity due to the rapid development of ...
  • Driven Precast Prestressed Concrete PPC Pile Design and Construction Optimization
    Driven Precast Prestressed Concrete (PPC) Pile Design and Construction Optimization
    Gould, Emily ;
    Aaleti, Sriram
    2019-01-01 | PDF
    The objective of the research detailed within this document was to investigate the origins of the ALDOT standard capacities and determine whether the capacities of ALDOT’s standard piles could reasonably be increased to allow for more efficient pile usage. To accomplish this goal, several primary tasks were completed. The first major task was devel ...
  • Development and Testing of the Miniaturized Pavement Pressuremeter for Use in Unbound Pavement Layers Summary
    Development and Testing of the Miniaturized Pavement Pressuremeter for Use in Unbound Pavement Layers [Summary]
    Cosentino, Paul J.
    2019-01-01 | PDF
    Florida Institute of Technology (FIT) researchers developed a small diameter pressuremeter which provides a direct measure of the stress-strain relationship in pavement layers
  • Investigating the Use of InPlace Lateral Pull Off Tests To Determine the Compressive Strength of Structural Concrete
    Investigating the Use of In-Place Lateral Pull Off Tests To Determine the Compressive Strength of Structural Concrete
    Sun, Charlie
    2019-01-01 | PDF
    The Kentucky Transportation Cabinet’s current practice for determining the compressive strength of structural concrete consists of two methods. Both methods require that samples be delivered to an off-site facility for testing. Accordingly, affected parties on the project site must wait for the delivery of samples to the off-site facility, the perf ...
  • Evaluation of the Rolling Density Meter for Rapid Continuous Measurement of Asphalt Mixture Density
    Evaluation of the Rolling Density Meter for Rapid Continuous Measurement of Asphalt Mixture Density
    Wilson, Bryan ;
    Sebesta, Stephen
    2019-01-01 | PDF
    The rolling-density meter (RDM) is a ground-penetrating radar (GPR)-based system tailored for rapidly and continuously measuring asphalt mixture density. This research analyzed the readiness level of the RDM and provided recommendations for how this technology could be used in QC/QA. To evaluate the RDM precision, four antennas were used in a labor ...
  • UltraHigh Performance Concrete in Ohio Student Study
    Ultra-High Performance Concrete in Ohio: Student Study
    Barnard, Elne ;
    Steinberg, Eric
    2019-01-01 | PDF
    This research reviewed the current and future uses of UHPC in the state of Ohio for bridge related structures. The first objective was to review the performance of UHPC in the Sollars Road adjacent prestressed concrete box beam bridge in Licking County constructed in 2014. UHPC was utilized in the shear keys between the box beams and included dowel ...
  • Field Study of Recycled Concrete Aggregate in French Drain
    Field Study of Recycled Concrete Aggregate in French Drain
    Nam, Boo Hyun ;
    Perez, Adam Lane
    2019-01-01 | PDF
    A field study of recycled concrete aggregate (RCA) in French drains was conducted to evaluate in situ exfiltration drainage performance of RCA as a pipe backfill material. The project was aimed at: (i) developing field test protocols to measure the exfiltration drainage performance of the RCA French drain, (ii) long-term monitoring (12 months in th ...
  • FY 2019 Oregon Transportation Needs and Issues Survey
    FY 2019 Oregon Transportation Needs and Issues Survey
    Knudson, Anthony
    2019-01-01 | PDF
    The Oregon Transportation Needs and Issues Survey was first conducted in 1993 and has been done roughly every two years. The latest survey was completed in Summer 2018 (State fiscal year (FY) 2019). This report summarizes the results of the FY 2019 survey. For some reoccurring questions, results are also compared to past surveys.
  • New Hampshire Statewide Freight Plan
    New Hampshire Statewide Freight Plan
    Whitman, Requardt, and Associates
    2019-01-01 | PDF
    The New Hampshire Statewide Freight Plan is a plan for present and future freight activities: the freight system, statewide economic context, freight needs, and projects and policies that will help New Hampshire maintain its quality of life and economic competitiveness by reducing the cost of transporting goods and improving the reliability of New ...
  • Effects of Safe Bicycle Passing Laws on Drivers Behavior and Bicyclists Safety
    Effects of Safe Bicycle Passing Laws on Drivers’ Behavior and Bicyclists’ Safety
    Oh, Jun-Seok ;
    Kwigizile, Valerian
    2018-12-31 | PDF
    This report identifies the effect of passing distance laws on drivers’ behaviors and bicyclist’s safety during an overtaking maneuver. Using an instrumented bicycle and driver survey, the study measured bicycle passing in a naturalistic field experiment using video recording, an ultrasonic distance measuring device, and a LiDAR. In order to evaluat ...
  • Better Construction Project Management through Better Scheduling
    Better Construction Project Management through Better Scheduling
    Mullen, Robert L ;
    Huynh, Nathan N.
    2018-12-31 | PDF
    This project investigated the effect of using Critical Path Method (CPM) schedules on South Carolina transportation projects. The analysis used 2,097 projects let after February 2007 and substantially completed by August 2015. Among these projects, 55.22% had CPM schedules. Among the projects without CPM schedules, 47.49% were delayed beyond the or ...
  • Signal Performance Measures Pilot Implementation
    Signal Performance Measures Pilot Implementation
    Remias, Stephen M. ;
    Waddell, Jonathan
    2018-12-31 | PDF
    The Michigan Department of Transportation (MDOT) is interested in finding a solution to typical traffic signal system concerns using new high-resolution signal controller data and performance measurement techniques. The strategy for this project was to implement two corridors in the state of Michigan with data logging controllers and implement the ...
  • Commercial Production of NonProprietary Ultra High Performance Concrete
    Commercial Production of Non-Proprietary Ultra High Performance Concrete
    El-Tawil, Sherif ;
    Tai, Yuh-Shiou
    2018-12-31 | PDF
    The vast majority of field usage of UHPC in the US, to date, has employed pre-packaged, proprietary materials. A previous project funded by MDOT developed a generic, cost-optimized UHPC mix (named MI-UHPC) that performed exceptionally well in the lab but was not well-suited for field implementation. This project explored the reasons why the generic ...
  • Microsimulation of the Impact of Access Management Practices to Pedestrians
    Microsimulation of the Impact of Access Management Practices to Pedestrians
    Chimba, Deo ;
    Soloka, Kevin
    2018-12-31 | PDF
    The study applied microsimulation to analyze the impact of access management (AM) to the operational performances of vehicles and pedestrians. A conceptual model was developed in VISSIM and VISWALK to examine the effect of access and signals density on different median types to the travel speed, travel time, delay and stopping. Access density, sign ...
  • Impact of Optimization Strategy and Adoption Rate on V2X Technology on Environmental Impact
    Impact of Optimization Strategy and Adoption Rate on V2X Technology on Environmental Impact
    McConky, Katie ;
    Rungta, Vaibhav
    2018-12-31 | PDF
    This research evaluated the effects of automated vehicle control strategies on system level emissions, travel time and wait time through a series of traffic lights. The study was conducted using traffic simulation and a realistic vehicle mix. Two control strategies were evaluated including a single vehicle control strategy and a multi-vehicle coord ...
  • Surface Resistivity Testing for Quality Control of Concrete Mixtures
    Surface Resistivity Testing for Quality Control of Concrete Mixtures
    Shults, Cody ;
    Hartell, Julie Ann
    2018-12-30 | PDF
    The purpose of this study is to investigate the potential of resistivity testing in assessing key mixture design parameters critical for durability performance of concrete mixtures. The methodology proposed will enable the development of a method based on resistivity criteria to identify the water-to-cement ratio of a given mixture whether the mixt ...
  • Evaluating Management Options to Increase Roadside Carbon Sequestration
    Evaluating Management Options to Increase Roadside Carbon Sequestration
    Ament, Robert ;
    Hartshorn, Tony
    2018-12-30 | PDF
    We estimated the amount of carbon sequestered along Montana Department of Transportation (MDT) roads and tested 3 different highway right-of-way (ROW) management techniques to increase carbon stocks. Using Geographic Information System techniques, the total ROW acreage owned by MDT was found to sequester 75,292 metric tons of carbon per year and to ...
  • Assessment of the Composite Arch Bridge
    Assessment of the Composite Arch Bridge
    Anderson, Ian A.
    ORCID ICON IMG
    2018-12-21 | PDF
    The Vermont Agency of Transportation (VTrans) installed a Composite Arch Bridge (CAB) system, known as Bridge-in-A-Backpack™, on a low volume road in a rural setting. The value of using this system is the potential to use smaller and lighter construction equipment for a restricted delivery location such as forest or farm roads. The CAB does not req ...
  • Surface Resistivity for Concrete Quality Assurance
    Surface Resistivity for Concrete Quality Assurance
    Ghafoori, Nader ;
    Tat, Stanley
    2018-12-16 | PDF
    The goal of this study was to determine the effectiveness of the surface resistivity test (SRT) for concrete quality assurance and to evaluate the relationship between SRT and the three chloride ion ingress methods currently used by various State departments of transportation (DOTs). Additionally, the influence of binder type and content, concrete ...
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