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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 7701 - 7720 of 36114 results
  • KYTC Maintenance Overview and Budget Analysis
    KYTC Maintenance Overview and Budget Analysis
    Albright, Nancy ;
    Gibson, Bryan
    2017-09-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) manages over 27,500 miles of the state’s roadways and is responsible for preserving many assets in a good state of repair, including bridges, traffic signals, lighting features, traffic signs, and guardrails. The Cabinet’s Maintenance function, which encompasses maintenance (e.g., patching potholes, repain ...
  • Quantifying roadside assessment for highway safety
    Quantifying roadside assessment for highway safety.
    Souleyrette, Reginald R. ;
    Fields, Michael A.
    2017-09-01 | PDF
    Many of Kentucky’s two-lane rural roads pose an above average risk for fixed object crashes. In Kentucky, run-off-road (ROR) collisions with fixed objects account for 18.9% of all crashes and 41.6% of fatal crashes. Accordingly, ROR crashes are a significant public safety hazard that must be addressed through judicious investments in safety improve ...
  • Opportunities for SharedUse Mobility Services in Rural Disadvantaged Communities in Californias San Joaquin Valley Existing Conditions and Conceptual Program Development
    Opportunities for Shared-Use Mobility Services in Rural Disadvantaged Communities in California’s San Joaquin Valley : Existing Conditions and Conceptual Program Development
    Rodler, Caroline ;
    Podolsky, Laura
    2017-09-01 | PDF
    Shared-use mobility services largely serve major metropolitan areas. However, increasingly officials, who represent rural communities, want to know whether these types of services may be able to provide more cost-effective access to rural residents than is currently possible by fixed-route and dial-a-ride transit services. Many of these officials m ...
  • Hydraulic and environmental behavior of recycled asphalt pavement in highway shoulder applications research summary
    Hydraulic and environmental behavior of recycled asphalt pavement in highway shoulder applications : research summary.
    Aydilek, Ahmet
    2017-09-01 | PDF
    The goal of this study was to investigate the environmental impacts associated with the use of RAP in highway shoulder edge drop-off applications.
  • Evaluation and analysis of liquid deicers for winter maintenance final report
    Evaluation and analysis of liquid deicers for winter maintenance : final report.
    Schneider, William ;
    Cutright, Teresa
    2017-09-01 | PDF
    The Ohio Department of Transportation (ODOT) uses mechanical and chemical methods to keep the roads safe during snow and ice events. Chemical solutions are available on the market to assist ODOT in preventing snow from bonding to the road surface as well as melting snow that is already bonded when NaCl rock salt or brine solution are no longer affe ...
  • Zero Emission Bay Area ZEBA Fuel Cell Bus Demonstration Results Sixth Report
    Zero Emission Bay Area (ZEBA) Fuel Cell Bus Demonstration Results: Sixth Report
    Eudy, Leslie ;
    Post, Matthew
    2017-09-01 | PDF
    This report presents results of a demonstration of fuel cell electric buses (FCEBs) operating in Oakland, California. Alameda-Contra Costa Transit District (AC Transit) leads the Zero Emission Bay Area (ZEBA) demonstration that includes 13 advanced-design fuel cell buses and two hydrogen fueling stations. The FCEBs in service at AC Transit are 40-f ...
  • Development of an Overlay Design Procedure for Composite Pavements
    Development of an Overlay Design Procedure for Composite Pavements
    Hu, Liangbo ;
    Chou, Eddie
    2017-09-01 | PDF
    The composite overlay design procedure currently used by ODOT sometimes produces very large overlay thicknesses that are deemed structurally unnecessary, especially for composite pavements already with thick asphalt overlays. This study was initiated to investigate the cause(s) and to develop a revised procedure. The current ODOT pavement overlay t ...
  • Standardizing Lightweight Deflectometer Modulus Measurements for Compaction Quality Assurance
    Standardizing Lightweight Deflectometer Modulus Measurements for Compaction Quality Assurance
    Schwartz, Charles W. ;
    Afsharikia, Zahra
    2017-09-01 | PDF
    To evaluate the compaction of unbound geomaterials under unsaturated conditions and replace the conventional methods with a practical modulus-based specification using LWD, this study examined three different LWDs, the Zorn ZFG 3000 LWD, Dynatest 3031 LWD, and Olson’s LWD-1. These devices were selected to represent the range of commercially availab ...
  • The Effects of DemandResponsive Parking on Transit Usage and Congestion Evidence From Sfpark
    The Effects of Demand-Responsive Parking on Transit Usage and Congestion: Evidence From Sfpark
    Ngo, Nicole S. ;
    Krishnamurth, Chandra Kiran
    2017-09-01 | PDF
    Parking is a serious issue in many urban areas, especially those experiencing rapid population growth. To address this problem, some cities have implemented demand-responsive pricing programs, where parking prices vary depending on the occupancy rate in a previous period. Yet, few empirical studies have rigorously evaluated these programs, though t ...
  • Assessment of continuous deflection measurement devices in Louisiana rolling wheel deflectometer technical summary
    Assessment of continuous deflection measurement devices in Louisiana - rolling wheel deflectometer : technical summary.
    Elseifi, Mostafa A.
    2017-09-01 | PDF
    The Louisiana Department of Transportation and Development (DOTD) uses a comprehensive pavement management system (PMS) through which the pavement network is surveyed once every two years. However, no structural condition data are collected to assist in the process of selecting a suitable treatment strategy. This may lead to two types of errors and ...
  • Preventive maintenance study interim report
    Preventive maintenance study : interim report.
    Anderson, Keith W. ;
    Weston, Jim
    2017-09-01 | PDF
    This interim report details the performance of 69 test sites treated with various preventive maintenance treatments. The maintenance treatments applied included crack sealing, full lane chip sealing, wheel path chip sealing, dig outs (mill and fill), blade patching, and combinations of dig outs and crack sealing and dig outs and full lane chip seal ...
  • Grand Forks Data Collection and Archival Study Phase IIIb
    Grand Forks Data Collection and Archival Study – Phase IIIb
    Sharma, Kshitij
    2017-09-01 | PDF
    As part of this study, a total of 16 intersections comprising of approx. 61 cameras were to be set to collect traffic volumes and speeds. Note that one of the intersections originally part of this project had not been brought online (resulting in delayed completion). In order to avoid further delays, in lieu of the offline intersections, other area ...
  • Travel to Food Transportation Barriers for the Food Insecure in Tampa Bay
    Travel to Food : Transportation Barriers for the Food Insecure in Tampa Bay
    Salzer, Kevin ;
    Joslin, Ann
    2017-09-01 | PDF
    In partnership with the Center for Urban Transportation Research (CUTR) at the University of South Florida (USF), the Transportation Innovation Group informed practical transportation solutions aimed at improved food access in Tampa Bay (Hillsborough, Pinellas and Pasco counties). The food pantry/bank sites that are part of Tampa Bay Network to End ...
  • Validity of multiple stress creep recovery MSCR test for DOTD asphalt binder specification final report 564
    Validity of multiple stress creep recovery (MSCR) test for DOTD asphalt binder specification : final report 564.
    Kabir, Md Sharear ;
    King Jr., William "Bill"
    2017-09-01 | PDF
    Numerous studies have shown that G*/Sinδ, the high temperature specification parameter for current Performance Graded (PG) asphalt binder is not adequate to reflect the rutting characteristics of polymer-modified binders. Consequently, many state Department of Transportation (DOT)s have added supplemental specifications, also known as “PG-Plus” tes ...
  • PrepME Software Implementation and Enhancement technical summary
    Prep-ME Software Implementation and Enhancement : technical summary
    Li, Joshua Q.
    2017-09-01 | PDF
    Pavement ME Design (previously MEPDG/DARWin-ME) is a significant advancement in pavement design, though requiring more inputs from various sources. Through efforts by the Louisiana Transportation Research Center (LTRC) and Federal Highway Administration (FHWA), the Louisiana Department of Transportation and Development (DOTD) initiated a state pool ...
  • Streamlined project closeout for construction at KYTC
    Streamlined project closeout for construction at KYTC.
    Johnson, Tyler A. ;
    Michaels, Dominic A.
    2017-09-01 | PDF
    Project closeout is the period between the end of construction and when a contract is finalized. During closeout, resources are held in encumbered funds intended for the project and in the contractor’s bonding capacity. Although the Kentucky Transportation Cabinet’s (KYTC) stated goal is to close out projects within 240 days of their ending, in 201 ...
  • Monitoring Winter Flow Conditions on the Ivishak River Alaska Final Report
    Monitoring Winter Flow Conditions on the Ivishak River, Alaska: Final Report
    Toniolo, Horacio ;
    Vas, Dragos
    2017-09-01 | PDF
    The Sagavanirktok River, a braided river on the Alaska North Slope, flows adjacent to the trans-Alaska pipeline for approximately 100 miles south of Prudhoe Bay. During an unprecedented flooding event in mid-May 2015, the pipeline was exposed in an area located approximately 20 miles south of Prudhoe Bay. The Ivishak River is a main tributary of th ...
  • Maintenance Decision Support System Phase III
    Maintenance Decision Support System, Phase III
    Wang, Eric ;
    LaCombe, Jeffrey
    2017-09-01 | PDF
    The main goal of the project was to address barriers that limit NDOTs ability to implement MDSS and MMS systems. The four project tasks included: Task 1: Develop system for tracking sand and/or deicing material usage: A system that tracks where and when salt/sand are used was developed and successfully tested. The system provides NDOT with the abil ...
  • Carbon Fiber Shear Reinforcement for Prestressed Bridge Girders
    Carbon Fiber Shear Reinforcement for Prestressed Bridge Girders
    Ward, John E. ;
    Magee, Mitch
    2017-09-01 | PDF
    Corrosion of reinforcing steel reduces life spans of bridges throughout the United States; therefore, using non-corroding carbon fiber reinforced polymer (CFRP) reinforcement is seen as a way to increase service life. The use of CFRP as the flexural reinforcement in bridge girders has been extensively studied. However, CFRP transverse reinforcement ...
  • Evaluating Curve Speed Behavior Using Shrp 2 Data
    Evaluating Curve Speed Behavior Using Shrp 2 Data
    Geedipally, Srinivas R. ;
    Pratt, Michael P.
    2017-08-31 | PDF
    Horizontal curves are associated with a disproportionate number of severe crashes. Factors that mostly influence horizontal curve safety are speed limit compliance, geometric features of the curve, sight distance, and traffic volume. In recent years, several attempts have been made to explore horizontal curve safety using the Second Strategic Highw ...
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