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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 6261 - 6280 of 36049 results
  • Synthesis Accelerating Implementation of Research Findings to Reduce Potential Concrete Pavement Joint Deterioration
    Synthesis: Accelerating Implementation of Research Findings to Reduce Potential Concrete Pavement Joint Deterioration
    Weiss, W Jason ;
    Olek, Jan
    2018-12-01 | PDF
    Distress has recently been observed in the joints of some concrete pavements, primarily in the wet-freeze states. This distress often begins in longitudinal joints, followed by transverse joints and results in the significant loss of material from the joint area. Although it may only affect approximately 10% of the concrete pavements system-wide, i ...
  • Measuring the Effectiveness of Competency Models for JobSpecific Professional Development of Engineers Engineering Technicians A Comparison of Core Competencies Across Civil Engineering Positions of Department of Transportation Agencies using Competency Models
    Measuring the Effectiveness of Competency Models for Job-Specific Professional Development of Engineers & Engineering Technicians: A Comparison of Core Competencies Across Civil Engineering Positions of Department of Transportation Agencies using Competency Models
    Ahmadjian, Chris ;
    Knodler, Michael A.
    2018-12-01 | PDF
    As many within the current transportation workforce approach retirement and the industry transitions into the 21st century, there are two notable challenges: 1) the incredible wealth of institutional knowledge that will be leaving the workforce, and 2) the continued increase in the application of new technologies, skills, and knowledge of the enter ...
  • Columbus Mississippi Field Aging and Laboratory Conditioning Study Plant Mixed and Laboratory Compacted Asphalt Mixtures
    Columbus Mississippi Field Aging and Laboratory Conditioning Study: Plant Mixed and Laboratory Compacted Asphalt Mixtures
    Howard, Isaac L. ;
    Bazuhair, Rabeea W.
    2018-12-01 | PDF
    The main objective of this report was to characterize asphalt containing warm mix technologies at various levels of field aging and laboratory conditioning in terms of mixture and binder properties encompassing the temperature range expected in Mississippi. The primary data sets collected for this overall body of work are from full-scale constructe ...
  • MDT Wildlife Accommodation Process
    MDT Wildlife Accommodation Process
    Harris, Kathy ;
    Traxler, Mark
    2018-12-01 | PDF
    Wildlife accommodations are features designed and implemented into a transportation facility to moderate the effects of the infrastructure on wildlife and their habitat. The Montana Department of Transportation (MDT) recognized there is not a defined procedure for addressing wildlife accommodations within their project development process. To date, ...
  • Engaging Youth to Increase Their Transportation System Support Understanding and Use
    Engaging Youth to Increase Their Transportation System Support Understanding and Use
    Shafer, Autumn ;
    Macary, Jared
    2018-12-01 | PDF
    This project seeks to build on the sparse national and non-Portland regional, past, transit-related research with youth to create and evaluate communication messaging that foster more positive attitudes, intentions, and behaviors related to transit and other non-car transportation options among Portland youth. The theory of planned behavior was app ...
  • Preliminary Evaluation of Perennial Ryegrass and Buffalograss Blends for Seeded Roadside Establishment to Comply with Storm Water Control Regulations
    Preliminary Evaluation of Perennial Ryegrass and Buffalograss Blends for Seeded Roadside Establishment to Comply with Storm Water Control Regulations
    Hoyle, Jared ;
    Baldwin, Carol
    2018-12-01 | PDF
    Buffalograss (Buchloë dactyloides [Nutt.] Engelm.) is a native low maintenance turfgrass species that is well adapted for lawns, parks, athletic fields, roadsides, and golf courses in the transition zone of the Midwestern United States. Perennial ryegrass (Lolium perenne) has also been used in many states as perennial roadside vegetation. Blending ...
  • Improving the Quality of Traffic Records for Traffic Incident Management
    Improving the Quality of Traffic Records for Traffic Incident Management
    Souleyrette, Reginald R. ;
    Chen, Mei
    2018-12-01 | PDF
    Traffic incidents in US roadways cause 25 percent of all delays experienced by users. The resulting congestion may lead to secondary crashes, increasing economic costs and further risking the lives of travelers. Traffic Incident Management is a process that detects, responds to, and clears traffic incidents as quickly as possible so that traffic fl ...
  • Rehabilitation Project Selection and Scheduling in Transportation Networks Research Brief
    Rehabilitation Project Selection and Scheduling in Transportation Networks [Research Brief]
    Song, Ziqi ;
    He, Yi
    2018-12-01 | PDF
    Highway project selection and scheduling are traditionally treated as two separate problems in the literature. It is critical to investigate how to select and schedule M&R projects in a way that can maximize their benefit or effectiveness while minimizing the traffic impacts of work zones across project development phases. There is a pressing need ...
  • Business and Commute Optimization System Development and Denverbased Case Study Research Brief
    Business and Commute Optimization System: Development and Denver-based Case Study [Research Brief]
    Abdallah, Moatassem ;
    Clevenger, Caroline M.
    2018-12-01 | PDF
    Mitigating traffic congestion and reducing transportation emissions are among the leading goals of most local, regional, national, and international agencies. Several guidelines rely primarily on strategies that support the following: 1) mixed land-use and transit-oriented developments, 2) multimodal transportation systems, and 3) design of active ...
  • Smart Cushion Innovations SCI 100GM Crash Attenuator
    Smart Cushion Innovations (SCI) 100GM Crash Attenuator
    Abernathy, Craig
    2018-12-01 | PDF
    Determine the effectiveness of the SCI100GM in a mainline application. The SCI100GM is a fully redirective, speed-dependent, non-gating, bi-directional crash attenuator with a reverse-tapered design to eliminate side panel stress during a collapse. In addition it has a low angle of exit on side impacts (<1°) to keep vehicles from rebounding back in ...
    Supporting Files
  • Columbus Mississippi Field Aging and Laboratory Conditioning Study Air Force Base and Single Aggregate Source Reference Asphalt Mixtures
    Columbus Mississippi Field Aging and Laboratory Conditioning Study: Air Force Base and Single Aggregate Source Reference Asphalt Mixtures
    Howard, Isaac L. ;
    Hansen, Bradley S.
    2018-12-01 | PDF
    This report’s primary objective was to provide complimentary and supporting reference information for field aging of asphalt concrete in Mississippi. The primary data sets collected for this overall body of work are from full-scale constructed test sections where cores were collected over time (Volume 2), and from plant mixed asphalt containing war ...
  • Go Buffalo Niagara Scaling up Transportation Demand Management to the Regional Level
    Go Buffalo Niagara: Scaling up Transportation Demand Management to the Regional Level
    O'Sullivan, Katie ;
    Dixon, Kelly
    2018-12-01 | PDF
    Go Buffalo Niagara is an initiative to replicate and scale up to the regional level the transportation demand management (TDM) services that have advanced at the Buffalo Niagara Medical Campus (BNMC) under the GO BNMC program. Go Buffalo Niagara partners—including the Niagara Frontier Transportation Authority (NFTA), the Greater Buffalo Niagara Reg ...
  • Development and Implementation of an MEGPDG for Rigid Pavements Phase 3
    Development and Implementation of an MEGPDG for Rigid Pavements, Phase 3
    Yang, Xiaoming ;
    Ley, M. Tyler
    2018-12-01 | PDF
    The objective of the Phase III of this project is to validate and calibrate the MEPDG for the concrete pavement design in Oklahoma. Both jointed plain concrete pavement (JPCP) and continuously reinforced concrete pavement (JPCP) were considered. Seven LTPP segments and 50 PMS pavement segments, including 30 JPCPs and 20 CRCPs, were selected and use ...
  • Auditory Alert Characteristics Impact on Crash Avoidance Warning Response
    Auditory Alert Characteristics Impact on Crash Avoidance Warning Response
    Marshall, Dawn ;
    Boyle, Linda Ng
    2018-12-01 | PDF
    The goal of this study was to understand driver response to a range of auditory characteristic levels, specifically to identify characteristics of a crash warning auditory interface that are measurable and have the potential to provide safety benefits. Drivers were exposed to driving scenarios with potential crash threats in a medium-fidelity drivi ...
  • LTBP News Winter 2019
    LTBP News: Winter 2019
    United States. Federal Highway Administration
    2018-12-01 | PDF
    The Federal Highway Administration's Long-Term Bridge Performance (LTBP) program issues a quarterly newsletter to inform you about the progress and activities of the program. Brief updates on progress in important program activities are provided, including data collection, data releases, new products and publications, and data analysis.
  • Highway Patrol Investment Levels vs Crash Outcomes
    Highway Patrol Investment Levels vs. Crash Outcomes
    Abaza, Osama
    2018-12-01 | PDF
    As a part of an effort to improve safety and evaluate optimal levels of investment in trooper patrols, Alaska’s Department of Transportation and Public Facilities (DOT&PF) and Alaska State Troopers (AST) with the coordination of the University of Alaska Anchorage (UAA) College of Engineering commenced a study to develop a relationship between highw ...
  • Development of PerformanceBased Seismic Design of Ordinary Standard Bridges
    Development of Performance-Based Seismic Design of Ordinary Standard Bridges
    Deb, Angshuman ;
    Zha, Alex L
    2018-12-01 | PDF
    Driven by the necessity to meet changing public expectations in the wake of natural disasters, such as earthquakes, the structural engineering community is moving towards more rational, risk-informed, and transparent approaches to structural design, amidst which probabilistic performance-based seismic design (PBSD) has emerged as the most scientifi ...
  • Flash Tracking for Accelerated Project Delivery APD
    Flash Tracking for Accelerated Project Delivery (APD)
    Pishdad-Bozorgi, Pardis ;
    de la Garza, Jesus M
    2018-12-01 | PDF
    The objectives of this study are to identify, assess, and validate best practices that are crucial for the successful completion of Flash Track projects. Five Georgia Department of Transportation (GDOT) projects and three Virginia Department of Transportation (VDOT) projects are used as case studies. These cases were carefully studied to validate e ...
  • Safety Effects of Protected and ProtectedPermissive LeftTurn Phases
    Safety Effects of Protected and Protected/Permissive Left-Turn Phases
    Medina, Juan C. ;
    Shea, M. Scott
    2018-12-01 | PDF
    This study evaluated the approach-level safety performance of left-turn phases including permissive, protected-permissive (PPLT), and protected indications, and the more recent flashing yellow arrow (FYA). Extensive data collection efforts included identification of suitable locations changing from a traditional to a FYA phase, exact date of such c ...
  • Safety Effectiveness Evaluation of Median Cable Barriers on Freeways in Ohio
    Safety Effectiveness Evaluation of Median Cable Barriers on Freeways in Ohio
    Eustace, Deogratias ;
    Almothaffar, Mohammad
    2018-12-01 | PDF
    The Ohio Department of Transportation (ODOT) began installing median cable barriers in 2003 along highway medians for all roadways that were narrower than 59 ft. The central goal of this work was to prevent cross-median crashes (CMCs) that raised a concern due to their frequencies and severe injuries they caused when they occurred. Cross-median cra ...
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