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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 7601 - 7620 of 36114 results
  • Heavy Haul Access to US Ports
    Heavy Haul Access to U.S. Ports.
    Simek, Chris
    2017-10-01 | PDF
    Texas exporters are increasingly concerned that current overweight regulations do not allow for the full use of the capacity of oceangoing containers. Even with an over-axle/over-gross weight tolerance permit (also known as the HB 2060 permit), the oceangoing container is not full. To comply with current weight regulations, some containers destined ...
  • Implementation of a Precast Inverted TBeam System in Virginia Part I Laboratory Investigations
    Implementation of a Precast Inverted T-Beam System in Virginia: Part I : Laboratory Investigations
    Menkulasi, Fatmir ;
    Cousins, Thomas E.
    2017-10-01 | PDF
    The inverted T-beam system provides an accelerated bridge construction alternative for short-to-medium-span bridges. The system consists of adjacent precast inverted T-beams with a cast-in-place concrete topping. This bridge system is not expected to experience the reflective cracking problems manifested in short-to-medium-span bridges constructed ...
  • Stakeholder Attitudes Knowledge and Engagement in Local Road Systems Planning and Decision Making
    Stakeholder Attitudes, Knowledge and Engagement in Local Road Systems Planning and Decision Making
    Narvaez, Guillermo ;
    Quick, Kathryn
    2017-10-01 | PDF
    Political and policy dynamics associated with local road systems planning, management, and financing merit special attention. This study: 1) analyzes stakeholder attitudes, knowledge, and engagement about financing for local road system management, to identify key gaps and conflicts, and 2) evaluates public communication and engagement methods, to ...
  • Cold Temperature Creep Compliance and Strength of Missouri Hot Mix Asphalt HMA Mixtures Using Indirect Tensile Test
    Cold Temperature Creep Compliance and Strength of Missouri Hot Mix Asphalt (HMA) Mixtures Using Indirect Tensile Test
    Lusher, Steven M.
    2017-10-01 | PDF
    Missouri Department of Transportation (MoDOT) has for the second time in about 10 years, performed the local calibration of the mechanistic-empirical pavement design guide software, now designated as AASHTOWare Pavement ME Design. Cold-temperature creep compliance and tensile strength of hot mix asphalt (HMA) are the two inputs to the thermal crack ...
  • Nonmyopic Relocation of Idle MobilityonDemand Vehicles as a Dynamic LocationAllocationQueueing Problem
    Non-myopic Relocation of Idle Mobility-on-Demand Vehicles as a Dynamic Location-Allocation-Queueing Problem
    Sayarshad, Hamid R ;
    Chow, Joseph Y J
    2017-10-01 | PDF
    Operation of on-demand services like taxis, dynamic ridesharing services, or vehicle sharing depends significantly on the positioning of idle vehicles to anticipate future demand and operational states. A new queueing-based formulation is proposed for the problem of relocating idle vehicles in an on-demand mobility service. The approach serves as a ...
  • Guidance for Site Selection Safety Effectiveness Evaluation and Crash Modification Factors of Median Cable Barriers in Tennessee
    Guidance for Site Selection, Safety Effectiveness Evaluation, and Crash Modification Factors of Median Cable Barriers in Tennessee
    Chimba, Deo
    2017-10-01 | PDF
    This project evaluated the median cable barrier safety effectiveness as experienced on Tennessee highways. Apart from descriptive statistics and questionnaire survey, before and after statistical evaluation was used to estimate the cable barriers Safety Effectiveness. The study revealed that installation of Cable Barriers in Tennessee considered th ...
  • Cooperative Mapping for Automated Vehicles
    Cooperative Mapping for Automated Vehicles
    Humphreys, Todd E. ;
    Murrian, Matthew J.
    2017-10-01 | PDF
    Localization is essential for automated vehicles, even for simple tasks such as lanekeeping. Some automated vehicle systems use their sensors to perceive their surroundings on-the-fly, such as the early variants of the Tesla Autopilot, while others such as the Waymo car navigate within a prior map. The latter approach is beneficial in that it helps ...
  • Economic Effect of Restricted Crossing UTurn Intersections in Louisiana Research Project Capsule
    Economic Effect of Restricted Crossing U-Turn Intersections in Louisiana : Research Project Capsule
    Schneider, Helmut
    2017-10-01 | PDF
    The Louisiana Department of Transportation and Development (DOTD) has made significant progress in reducing collisions and increasing capacity along its highway corridors. Deployment of access management techniques, such as restricted crossing U-turn (RCUT) intersections, has reduced traffic congestion and injuries/damage associated with left-turn ...
  • Implementation of Maturity for Concrete Strength Measurement and Pay Tech Summary
    Implementation of Maturity for Concrete Strength Measurement and Pay : Tech Summary
    Collier, Zachary
    2017-10-01 | PDF
    Using the maturity to determine concrete strength has been done for more than four decades. The concept was originally conceived in the late 1940s and early 1950s. More and more state and municipal DOTs are implementing its use every year, with some having used this technology as early as the mid-1980s. There are many proven benefits for the use of ...
  • Rockfall Hazard Process Assessment Final Project Report
    Rockfall Hazard Process Assessment: Final Project Report
    Beckstrand, Darren L. ;
    Black, Brent A.
    2017-10-01 | PDF
    After a decade of using the Rockfall Hazard Rating System (RHRS), the Montana Department of Transportation (MDT) sought a reassessment of their rockfall hazard evaluation process. Their prior system was a slightly modified version of the RHRS and was implemented in 2005. This reassessment included an update of their existing rockfall database, revi ...
  • Culvert Rating Guide Second Edition
    Culvert Rating Guide, Second Edition
    Lawson, William D. ;
    Seo, Hoyoung
    2017-10-01 | PDF
    The purpose of this Culvert Rating Guide is to present a clear, repeatable and valid procedure for Texas Department of Transportation (TxDOT) engineers and their consultants to use for load rating culverts in the TxDOT roadway system. Stated another way, the Culvert Rating Guide is intended to clarify policy assumptions, minimize procedural inconsi ...
  • Predicting Scour of Bedrock in Wisconsin Research Brief
    Predicting Scour of Bedrock in Wisconsin : Research Brief
    Titi, Hani H. ;
    Reid, Daniel
    2017-10-01 | PDF
    Bridge scour, the erosion or removal of sediment due to flowing water around piers or abutments, is a major cause of highway bridge failure in the United States. After the collapse of New York's Schoharie Creek Bridge during a flood in 1987, the Federal Highway Administration (FHWA) issued a technical advisory that required evaluation of all bridge ...
  • Low cracking concretes for the closure pours and overlays of the Dunlap Creek Bridge final report
    Low cracking concretes for the closure pours and overlays of the Dunlap Creek Bridge : final report.
    Ozyildirim, Celik ;
    Nair, Harikrishnan
    2017-10-01 | PDF
    Joints, wide cracks, and poor-quality concretes facilitate the intrusion of chlorides, causing corrosion in bridge decks and substructures. In this study, joints were replaced with closure pours (link slabs) consisting of low permeability fiber-reinforced concretes resistant to wide cracking; overlays consisted of concretes with a low cracking pote ...
  • Evaluation of DOTDs Existing Queue Estimation Procedures Research Project Capsule
    Evaluation of DOTD's Existing Queue Estimation Procedures : Research Project Capsule
    Codjoe, Julius ;
    Zeringue, Kirk M.
    2017-10-01 | PDF
    The primary objective of this study is to evaluate the effectiveness of DOTD’s queue estimation procedures by comparing results with those obtained directly from site observations through video camera footage or other means. Actual queue start times and queue lengths during the closure of one or more lanes at a freeway work zone will be measured an ...
  • Prevention of Stripping under Chip Seals
    Prevention of Stripping under Chip Seals
    Rettner, David L. ;
    Tompkins, Derek
    2017-10-01 | PDF
    Eighteen chip-sealed roadways in eight cities and counties in Minnesota were evaluated both in the field (for condition surveys and density tests) and in the laboratory (for permeability, stripping, tensile-strength ratio, asphalt film thickness, and mix properties) to evaluate factors associated with stripping in asphalt pavements under chip-seal ...
  • Lean Construction Applications for Bridge Inspection
    Lean Construction Applications for Bridge Inspection
    Masoud, Emal ;
    Clarke-Sather, Abigail
    2017-10-01 | PDF
    Lean philosophy was used to analyze the efficiency of bridge inspection. Emphasis was put on identifying activities that add value to the final output, an owner approved bridge inspection report. 26 bridge inspections were shadowed. Time spent on bridge inspection activities was recorded for all bridge inspection stages listed sequentially: review ...
  • Rockfall Hazard Process Assessment Project Summary
    Rockfall Hazard Process Assessment: Project Summary
    Beckstrand, Darren L. ;
    Black, Brent A.
    2017-10-01 | PDF
    The Montana Department of Transportation (MDT) implemented its Rockfall Hazard Rating System (RHRS) between 2003 and 2005, obtaining information on the state's rock slopes and their associated hazards. The RHRS data facilitated decision-making in an informal process over the next several years. MDT applied the RHRS ratings in an informal process, r ...
  • Exploring Naturalistic Driving Data for Distracted Driving Measures Tech Summary
    Exploring Naturalistic Driving Data for Distracted Driving Measures : Tech Summary
    Ishak, Sherif S. ;
    Zeringue, Kirk M.
    2017-10-01 | PDF
    Distracted driving is a dangerous epidemic that continues to cause deaths and injuries in related crashes throughout the U.S. According to the National Highway Traffic Safety Administration, 3,328 people (including 540 non-occupants) were killed and an estimated additional 421,000 were injured in 2012 from distraction-affected crashes. In Louisiana ...
  • A Novel Approach for the Characterization of the Rutting Performance of Pavement Foundations
    A Novel Approach for the Characterization of the Rutting Performance of Pavement Foundations
    Ashtiani, Reza S. ;
    Tseng, Bill
    2017-10-01 | PDF
    Permanent deformation within the unbound granular is a predominant feature that results in the degradation and loss of serviceability to the pavement structure as the passage of traffic wheel loads accumulate. Proper characterization of the multi-layer structures is necessary to improve the rutting performance by mechanistically identifying the fac ...
  • Review of Project Development Practices and Project Management Resources at State Transportation Agencies
    Review of Project Development Practices and Project Management Resources at State Transportation Agencies
    Van Dyke, Christopher ;
    Gibson, Bryan
    2017-10-01 | PDF
    At the Kentucky Transportation Cabinet’s (KYTC) Department of Highways, project development encompasses all the work activities needed to move a transportation project from concept and project initiation to construction letting. Developing projects efficiently requires the adoption of sound project management practices. And having recourse to valid ...
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