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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 4941 - 4960 of 36020 results
  • A Statewide Assessment of Public Transit Funding Needs for Counties Trending Urban in Georgia
    A Statewide Assessment of Public Transit Funding Needs for Counties Trending Urban in Georgia
    Garrow, Laurie A. ;
    Douthat, Thomas
    2020-02-01 | PDF
    This study predicts how spatial and temporal population changes from the 2010 and 2020 decennial censuses will impact funding for the Federal Transit Administration (FTA) § 5311 rural and FTA § 5307 urban transit programs, both in Georgia and nationwide. Binary logit models and geographic information system (GIS) methods were used to predict which ...
  • Improved Calculation of Scour Potential in Cohesive Soils and Scoursusceptible Rock
    Improved Calculation of Scour Potential in Cohesive Soils and Scour-susceptible Rock
    Liu, Zhen Leo ;
    Sheefa, Darud E
    2020-02-01 | PDF
    This report summarizes the work on the improved calculation of scour potential in cohesive soils and scour-susceptible rock. A state of the practice survey was first conducted to gather information about the scour evaluation in cohesive soils and scour-susceptible rock. This includes a literature review covering the concepts and understanding of sc ...
  • HOT Lane Detection and Management Scan
    HOT Lane Detection and Management Scan
    Chamberlin, Robert ;
    Haghighi, Nima
    2020-02-01 | PDF
    UDOT launched its HOT lane program on I-15 in 2010 and it currently covers 72 miles of I-15. The program charges tolls to drivers of Single-Occupant Vehicles (SOVs) using the HOV lanes as Express Lanes while high-occupancy vehicles use the lanes for free. There are 32 HOT lane agencies in the US and, to date, all of them, including UDOT, rely on st ...
  • Evaluation of Georgia Department of Transportation Office of Program Delivery Project Management Organizational Structure in Comparison to Other States DOT Practices Tier 1 Best Management Practices BMPs of DesignBidBuild Transportation Program
    Evaluation of Georgia Department of Transportation Office of Program Delivery Project Management Organizational Structure in Comparison to Other States’ DOT Practices Tier 1: Best Management Practices (BMPs) of Design-Bid-Build Transportation Program
    Ashuri, Baabak ;
    Baek, Minsoo
    2020-02-01 | PDF
    The goal of this research is to identify and document the best management practices (BMPs) in state departments of transportation (DOTs) with regard to the structure of traditional (i.e., design–bid–build) project delivery. To achieve this goal, the researchers conducted an extensive literature review, survey, content analysis, and interviews with ...
  • Pavement Preservation How Kentucky Tennessee and West Virginia EDC4 PeertoPeer Exchanges techbrief
    Pavement Preservation How: Kentucky, Tennessee, and West Virginia - EDC-4 Peer-to-Peer Exchanges [techbrief]
    Scofield, Larry ;
    Gross, Jerod
    2020-02-01 | PDF
    On September 25th, 2018, an FHWA-sponsored EDC-4 “How” Pavement Preservation State Peer-to-Peer Exchange was conducted in Lexington, Kentucky, with one FHWA representative and eight DOT representatives from Kentucky, two from Tennessee, and two from West Virginia. Mr. Larry Galehouse with the National Center for Pavement Preservation and Mr. Larry ...
  • Expanding the Success of SaltTolerant Roadside Turfgrasses Through Innovation and Education
    Expanding the Success of Salt-Tolerant Roadside Turfgrasses Through Innovation and Education
    Watkins, Eric ;
    Trappe, Jon
    2020-02-01 | PDF
    Our project was based on the need to water new roadside installations more efficiently to ensure that the turfgrasses, especially the new salt-tolerant mixes, establish more successfully with a predictable and uniform amount of water during the establishment period. The first objective of this project was to do a preliminary investigation of altern ...
  • Field Validation of Equivalent Modulus for Stabilized Subgrade Layer
    Field Validation of Equivalent Modulus for Stabilized Subgrade Layer
    Martinez, Mark
    2020-02-01 | PDF
    This report presents the findings associated with an effort to evaluate projects with weak subgrades utilizing the newly developed Equivalent Modulus Analysis (EMA) spreadsheet created by the Louisiana Department of Transportation and Development (DOTD). The EMA spreadsheet was developed to simplify the design process by allowing for easy applicati ...
  • Accelerated Weathering of Traffic Control Materials by Laboratory Testing
    Accelerated Weathering of Traffic Control Materials by Laboratory Testing
    Elsafty, Adel ;
    Hsuan, Yick (Grace)
    2020-02-01 | PDF
    This project was undertaken to identify the appropriate accelerated laboratory testing procedures and conditions for predicting weathering deterioration of coating materials for steel structures and retroreflective sign sheeting materials for traffic control. The current standard test methods specified by state transportation departments, FHWA, and ...
  • Improve Traffic Volume Estimates From MnDOTs Regional Traffic Management Center
    Improve Traffic Volume Estimates From MnDOT’s Regional Traffic Management Center
    Kwon, Taek M.
    2020-02-01 | PDF
    The Regional Transportation Management Center (RTMC) at the Minnesota Department of Transportation (MnDOT) deploys a large number of traffic detectors in the Twin Cities’ freeway network and continuously collects traffic data. While RTMC mainly uses the data for traffic and incident management, the TFA (Traffic Forecasting and Analysis) office uses ...
  • Strategies for Communicating Quality Expectations for Environmental Service Contracts Phase II
    Strategies for Communicating Quality Expectations for Environmental Service Contracts: Phase II
    Kingsley, Gordon ;
    Weber, Johann
    2020-02-01 | PDF
    This study explores the communication and coordination practices between project team members contributing to the Plan Development Process of the Georgia Department of Transportation (GDOT). This study builds on Phase I of this project, published as GDOT Report No. FHWA-GA-17-1506. The overarching goal of this research is to improve quality and eff ...
  • Laboratory Study of the Failure Characteristics of Fouled Ballast Phase II
    Laboratory Study of the Failure Characteristics of Fouled Ballast: Phase II
    Rohrman, Andrew K. ;
    Ho, Carlton L.
    2020-02-01 | PDF
    This report presents the results of a series of triaxial tests and modified box tests performed on abraded ballast at the University of Massachusetts Amherst. While Phase I involved the same tests performed on highly angular ballast, this phase is broken into two parts: Phase IIa and IIb. Both parts use ballast taken from a rail line in Shelburne F ...
  • Determining the Distribution and Habitat Associations of the Northern LongEared Bat in North Georgia
    Determining the Distribution and Habitat Associations of the Northern Long-Eared Bat in North Georgia
    Castleberry, Steven B ;
    Hepinstall-Cymerman, Jeffrey
    2020-02-01 | PDF
    Significant mortality from White-nose Syndrome (WNS) has made northern long-eared bats a management priority while simultaneously creating uncertainty around where the species remains prevalent on the landscape. The culmination of these factors results in the need to develop distinct habitat associations for northern long-eared bats in north Georgi ...
  • Best Practices for Managing Utility Congestion Within RightsofWay
    Best Practices for Managing Utility Congestion Within Rights-of-Way
    Minnesota. Department of Transportation. Local Road Research Board
    2020-02-01 | PDF
    Congestion of utility lines within rights-of-way has become a challenge for Minnesota local transportation agencies. This guidebook addresses common issues and needs faced by agencies, and shares accepted best practices for planning and installing utility services that can help agencies better manage utility requests and needs. This guide provides ...
  • Evaluation of Techniques to Remove Defective Grout from PostTensioning Tendons
    Evaluation of Techniques to Remove Defective Grout from Post-Tensioning Tendons
    Hamilton, H.R. ;
    Patil, Satyajeet R
    2020-02-01 | PDF
    Bridge girders in the U.S. are commonly constructed using multistrand post-tensioned (PT) tendons. Defective grout has been found in some of recently constructed bridges in the form of soft grout, which consists of segregated and unhardened grout with free moisture and is often the cause of corrosion of prestressing strands. To address this problem ...
  • Study of AI Based Methods for Characterization of Geotechnical Site Investigation Data
    Study of AI Based Methods for Characterization of Geotechnical Site Investigation Data
    Wang, Hui ;
    Wang, Xiangrong
    2020-02-01 | PDF
    Due to the inadequate knowledge of the soil forming histories and/or human activities, the subsurface soil layers are difficult to ascertain. Subsurface uncertainty and its influence on geotechnical design have long been a challenge facing practitioners. Recently, the ASCE Geo-institute has developed the Data Interchange for Geotechnical and Geoenv ...
  • Evaluation of Maintenance Procedures for Bridge Spalling on Parapet Walls
    Evaluation of Maintenance Procedures for Bridge Spalling on Parapet Walls
    Miller, Richard ;
    Delatte, Norbert J.
    2020-02-01 | PDF
    Parapet wall deterioration concerns the Ohio Department of Transportation. The spalling of parapet walls presents a danger to the traveling public as pieces of deteriorated concrete may fall onto the road below. The current repair method is to chip off the weakened concrete using pneumatic chipping hammers. However, this process not only damages th ...
  • Determining the Optimal Traffic Opening Timing Through an InSitu NDT Method for Concrete Early Age Properties
    Determining the Optimal Traffic Opening Timing Through an In-Situ NDT Method for Concrete Early Age Properties
    Su, Yen-Fang ;
    Han, Guangshuai
    2020-02-01 | PDF
    Developing a reliable in-situ testing method to determine the strength of concrete for traffic opening is a critical need for INDOT, due to the fast-pace construction schedule exposes concrete pavements and/or structures undergoing a substantial loading conditions even at its early ages. Nevertheless, the current methods for determining traffic ope ...
  • Development of an Improved Design Procedure for Unbonded Concrete Overlays
    Development of an Improved Design Procedure for Unbonded Concrete Overlays
    Khazanovich, Lev ;
    Vandenbossche, Julie
    2020-02-01 | PDF
    An unbonded portland cement concrete overlay of concrete pavements (UBOL) is a rehabilitation technique in which the new overlay is isolated from the existing distressed pavement using a separator layer. Typically, a 1-to 2-in asphalt separator layer (or interlayer) is used. Recent innovations in the unbonded overlay technology have led to the adop ...
  • Sensitivity of Dynamic Modulus and Flow Number of CDOT HMA Mixes in the Pavement MechanisticEmpirical Design PMED
    Sensitivity of Dynamic Modulus and Flow Number of CDOT HMA Mixes in the Pavement Mechanistic-Empirical Design (PMED)
    Islam, Md Rashadul ;
    Kalevela, Sylvester A.
    2020-02-01 | PDF
    Colorado Department of Transportation (CDOT) has dynamic modulus (E*), and flow number (N) database of different mixes from different regions of Colorado. The sensitivities of these mixes considering factors such as mix types, aggregates source, volumetric properties, contractors, preparation times, binders, etc. on E*, and N, and on the pavement p ...
  • Autonomous Truck Mounted Attenuator ATMA Pilot
    Autonomous Truck Mounted Attenuator (ATMA) Pilot
    Kohls, Airton G
    2020-02-01 | PDF
    The objective of this research was to provide the Tennessee Department of Transportation (TDOT) an evaluation on the performance of an autonomous truck mounted attenuator (ATMA) system(s), based on previous relevant research projects and on actual testing of the equipment during a demonstration pilot. A set of testing scenarios were developed in cl ...
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