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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 7101 - 7120 of 36104 results
  • A Trusted Platform for Transportation Data Sharing Stakeholder Engagement
    A Trusted Platform for Transportation Data Sharing & Stakeholder Engagement
    Raisch, William G.
    2018-03-01 | PDF
    Information sharing to support critical transportation systems presents numerous challenges given the diversity of information sources and visual representations typically used to portray system performance and characteristics12. This research project focused on advancing transportation data sharing and stakeholder engagement by adapting an informa ...
  • Best Practices for Construction and Repair of Bridge Approaches and Departures
    Best Practices for Construction and Repair of Bridge Approaches and Departures
    Lu, Qing ;
    Li, Mingyang
    2018-03-01 | PDF
    Florida Department of Transportation (FDOT) has experienced frequent distresses in bridge approach/departure asphalt pavements in its highway system. Commonly observed distresses include alligator cracking and rutting, which reduce roadway smoothness and safety. To minimize the pavement distress and improve ride quality, there is a need to determin ...
    Supporting Files
  • The Spatial Effect of SocioEconomic Demographics on Transit Ridership a Case Study in New York
    The Spatial Effect of Socio-Economic Demographics on Transit Ridership: a Case Study in New York
    Volovski, Matthew
    2018-03-01 | PDF
    Demand for vehicle and public transportation systems continues to increase in and around major urban centers. This increase is especially pronounced during the morning and evening commutes and is further complicated by the complex spatial interactions that influence the variation in system demand. In an effort to help agencies better understand thi ...
  • Comparing LowCost Methods for Stabilizing Diversions and Ditches
    Comparing Low-Cost Methods for Stabilizing Diversions and Ditches
    McLaughlin, Richard A. ;
    Polizzi, Maria A
    2018-03-01 | PDF
    Previous studies have demonstrated that a major source of sediment arriving at sediment basins is erosion from unlined water conveyances. While check dams provide some reduction, lining the diversions and ditches can be highly effective. The typical liner is a rolled erosion control blanket (RECB) made of natural fibers, such as excelsior, jute, or ...
  • Validating the National Performance Management Research Data Set NPMRDS for South Dakota
    Validating the National Performance Management Research Data Set (NPMRDS) for South Dakota
    Turner, Shawn M. ;
    Koeneman, Pete
    2018-03-01 | PDF
    The Texas A&M Transportation Institute (TTI) evaluated the accuracy, temporal completeness, and geographic coverage of NPMRDS in South Dakota to determine whether the South Dakota Department of Transportation (SDDOT) should use the National Performance Measure Research Data Set (NPMRDS) for the federal performance management measure regulations as ...
  • InVehicle Dynamic CurveSpeed Warnings at HighRisk Rural Curves
    In-Vehicle Dynamic Curve-Speed Warnings at High-Risk Rural Curves
    Davis, Brian ;
    Morris, Nichole L.
    2018-03-01 | PDF
    Lane-departure crashes at horizontal curves represent a significant portion of fatal crashes on rural Minnesota roads. Because of this, solutions are needed to aid drivers in identifying upcoming curves and inform them of a safe speed at which they should navigate the curve. One method for achieving this that avoids costly infrastructure-based meth ...
  • Successes in Stewardship Updates to the Indiana Bat and Northern LongEared Bat Programmatic Consultation Accelerate Project Delivery and Improve Mitigation Outcomes
    Successes in Stewardship - Updates to the Indiana Bat and Northern Long-Eared Bat Programmatic Consultation Accelerate Project Delivery and Improve Mitigation Outcomes
    United States. Federal Highway Administration
    2018-03-01 | PDF
    Successes in Stewardship is a Federal Highway Administration (FHWA) bimonthly newsletter highlighting current best practices in stewardship and environmental review from around the country.
  • Developing BridgeScour Equations for Colorado Mountain Streams
    Developing Bridge-Scour Equations for Colorado Mountain Streams
    Molinas, Albert ;
    Mommandi, Amanullah
    2018-03-01 | PDF
    The primary objective of this study is to provide a technical tool to compute bridge scour in steep mountain channels. The Colorado Department of Transportation (CDOT) builds and maintains many roadway projects with bridges that cross rivers and small streams. CDOT currently uses Federal Highway Administration's (FHWA's) HEC-18 methods to estimate ...
  • Improved Regionalization of Quality Assurance QA Functions
    Improved Regionalization of Quality Assurance (QA) Functions
    Dave, Eshan V. ;
    Daniel, Jo Sias
    2018-03-01 | PDF
    This study conducted an in-depth review of the current quality assurance (QA) processes for precast (PCE) and prestressed concrete elements (PSE) used in the highway construction in the New England region. On basis of the review of current practices and through input from the six New England State Transportation Agencies (STAs) a set of unified QA ...
  • Chemical Composition and Fuel Properties of Alternative Jet Fuels
    Chemical Composition and Fuel Properties of Alternative Jet Fuels
    Pires, Anamaria P P ;
    Han, Yinglei
    2018-03-01 | PDF
    The chemical composition and fuel properties of nine alternative jet fuels (named as AJF 1-9) and three commercial jet fuels (named as CJF 1, 2 and 3) are reported in this work. The fuels were characterized by GC/MS, SEP-GC/MS (for quantification of oxygenated molecules), viscosity, density, water content, water solubility at 0 °C, carbonyl content ...
  • Optimizing Fleet Composition and Size under Uncertainty in Urban Transit Systems
    Optimizing Fleet Composition and Size under Uncertainty in Urban Transit Systems
    Li, Haitao ;
    Pan, Deanna
    2018-03-01 | PDF
    The goal of this project was to study the fleet sizing problem in the context of an urban transit system with several unique features: (1) a fleet with a heterogeneous mixture of vehicles; (2) integrated decision support, including acquisition, retirement, and allocation decisions over multiple time periods; and (3) various uncertainties regarding ...
  • Review of State Transportation Funding Initiatives
    Review of State Transportation Funding Initiatives
    Gibson, Bryan ;
    Van Dyke, Christopher
    2018-03-01 | PDF
    Despite significant cutbacks to the funding allocated to state departments of transportation (DOTs), demand for accessible and reliable transportation has increased even as existing transportation infrastructure has continued to age. Falling gasoline tax revenues resulting from increasing fuel efficiency and technological advancements have prevente ...
  • Evaluation of CrackSealing Milled Pavement in the Effort to Reduce Transverse Cracking
    Evaluation of Crack-Sealing Milled Pavement in the Effort to Reduce Transverse Cracking
    Abernathy, Craig
    2018-03-01 | PDF
    To determine if crack sealing milled pavement prior to overlay will deter the migration of transverse cracking, or have an effect on pavement performance, when compared to an adjacent milled pavement that receives no crack sealing treatment.Record contains 2015 and 2018 reports.
    Supporting Files
  • Effectiveness of Stationary Police Vehicles with Blue Lights in Freeway Work Zones
    Effectiveness of Stationary Police Vehicles with Blue Lights in Freeway Work Zones
    Gan, Albert ;
    Wu, Wanyang
    2018-03-01 | PDF
    Work zones can create hazards for both workers and drivers. Reducing vehicle speeds near work zones and increasing the separation between traffic flows and work zones have been shown to reduce both the number and severity of work zone crashes. However, increasing driver observance of reduced speed limits in work zones requires innovative and effect ...
    Supporting Files
  • Assessment of the Traffic Speed Deflectometer in Louisiana for Pavement Structural Evaluation
    Assessment of the Traffic Speed Deflectometer in Louisiana for Pavement Structural Evaluation
    Elseifi, Mostafa A. ;
    Zihan, Zia U. A.
    2018-03-01 | PDF
    Many state agencies have recognized the importance of incorporating pavement structural conditions in the selection of maintenance and rehabilitation (M&R) strategies along with functional indices. To measure in-service pavement structural capacity, surface deflection under a defined load has been typically used. The Traffic Speed Deflectometer (TS ...
    Supporting Files
  • Extending Maximum Length of the Folded Steel Plate Girder Bridge System FSPGBS exceeding 100 ft with capability to Incorporate Camber
    Extending Maximum Length of the Folded Steel Plate Girder Bridge System (FSPGBS), exceeding 100 ft. with capability to Incorporate Camber
    Azizinamini, Atorod
    2018-03-01 | PDF
    Under this project, methodologies were developed to extend the maximum length of the FSPGBS to about 100 ft. Work consisted of envisioning the connection detail and carrying out numerous non-linear finite element analysis and developing the proof of concept test, that includes testing two FSGBS with types of connections envisioned. Under this proje ...
  • Safety in Numbers Pedestrian and Bicyclist Activity and Safety in Minneapolis
    Safety in Numbers : Pedestrian and Bicyclist Activity and Safety in Minneapolis
    Carlson, Kristin ;
    Murphy, Brendan
    2018-03-01 | PDF
    This investigation aims to evaluate whether the Safety in Numbers phenomenon is observable in the midwestern U.S. city of Minneapolis, Minnesota. Safety in Numbers (SIN) refers to the phenomenon that pedestrian safety is positively correlated with increased pedestrian traffic in a given area. Walking and bicycling are increasingly becoming importan ...
  • Asphalt Binder Extraction Protocol for Determining Amount PG Characteristics of Binders Recovered from Asphalt Mixtures
    Asphalt Binder Extraction Protocol for Determining Amount & PG Characteristics of Binders Recovered from Asphalt Mixtures
    Rodezno, Carolina ;
    Grant, Julian
    2018-03-01 | PDF
    Accurate determination of asphalt content is critical to ensuring the quality of asphalt mixes used in Wisconsin’s road projects. The two most-common methods for determining asphalt content are the American Association of State Highway and Transportation Officials (AASHTO) solvent extraction and ignition tests. These procedures are well established ...
    Supporting Files
  • Characterization of Asphalt Concrete Dynamic Modulus in South Carolina
    Characterization of Asphalt Concrete Dynamic Modulus in South Carolina
    Amirkhanian, Serji N. ;
    Xiao, Feipeng
    2018-03-01 | PDF
    Many states around the country still use the 1972, 1986, or 1993 AASHTO Design Guides, which rely on empirical relationships between paving material properties and the structural performance of pavement layers. These empirical relationships were developed based on the 1950’s American Association of State Highway Officials (AASHO) Road Test data, wh ...
  • Development of Guidelines for Selection and Evaluation of Tack Coats in Oklahoma
    Development of Guidelines for Selection and Evaluation of Tack Coats in Oklahoma
    Ghabchi, Rouzbeh ;
    Zaman, Musharraf M.
    2018-03-01 | PDF
    Asphalt pavements are generally constructed by compacting asphalt mixes in multiple lifts to achieve the required density across the layers. Also, depending on pavement preservation and maintenance plan, from time to time, a thin overlay may be constructed over an existing asphalt pavement or a Portland Cement Concrete (PCC) pavement. The quality a ...
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