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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 4461 - 4480 of 36019 results
  • Characterization of Reclaimed Asphalt Pavement RAP for HMA Surface Courses in Massachusetts
    Characterization of Reclaimed Asphalt Pavement (RAP) for HMA Surface Courses in Massachusetts
    Mogawer, Walaa S. ;
    Austerman, Alexander J.
    2020-08-01 | PDF
    The goal of this study was to understand the properties of the reclaimed asphalt pavement (RAP) sources available in Massachusetts and develop guidelines or recommendations for using RAP in new hot-mix asphalt surface course mixtures. MassDOT specifications allow up to 15% RAP by dry weight in surface mixtures without using a softer-grade virgin bi ...
  • Network Level Pavement Structural Testing With the Traffic Speed Deflectometer
    Network Level Pavement Structural Testing With the Traffic Speed Deflectometer
    Katicha, Samer W. ;
    Shrestha, Shivesh
    2020-08-01 | PDF
    This report describes research conducted to incorporate pavement structural condition information obtained from the Traffic Speed Deflectometer (TSD) into the Virginia Department of Transportation (VDOT) pavement management system decision making process for bituminous pavement sections. Testing was conducted on a 4,000-mile (1,500 interstate miles ...
  • Phase III Transportation Investment Act Benchmark Assessment and BenefitCost Analysis 20132018
    Phase III: Transportation Investment Act — Benchmark Assessment and Benefit–Cost Analysis, 2013–2018
    Ross, Catherine L. ;
    Boston, Thomas D.
    2020-08-01 | PDF
    The Transportation Investment Act (TIA) is a voter initiative in Georgia that adds 1 percent to local sales taxes over 10 years. Of additional revenue, 75 percent is devoted to approved transportation investment projects, and 25 percent is returned to local jurisdictions to spend on any transportation projects they choose. The taxing authority last ...
  • Examination of Features Correlated With Roadway Departure Crashes on Rural Roads
    Examination of Features Correlated With Roadway Departure Crashes on Rural Roads
    Appiah, Justice ;
    Zhao, Mo
    2020-08-01 | PDF
    Roadway departure (RD) crashes are one of the major causes of fatalities on highways. Reducing the number and severity of RD crashes is one of the emphasis areas of the strategic highway safety plan for many state departments of transportation in the United States. Many significant efforts have been aimed at reducing RD crashes, and a continued foc ...
  • Innovative and Integrative Best Management Practices BMPs for Surface and Groundwater Protection
    Innovative and Integrative Best Management Practices (BMPs) for Surface and Groundwater Protection
    Kibler, Kelly M ;
    Chang, Ni-Bin
    2020-08-01 | PDF
    In this project, development of innovative methods for the integrated evaluation of surface and groundwaters inform practical applications for stormwater best management practices (BMPs) aimed at remediating stormwater nutrient impacts. To explore innovative uses of engineered media, five novel chemically activated media (CAM) were developed and te ...
  • Evaluation Beneficiation and Implementation of Alternative Concrete Pozzolans for Transportation Infrastructure
    Evaluation, Beneficiation, and Implementation of Alternative Concrete Pozzolans for Transportation Infrastructure
    Rajabipour, Farshad ;
    Jafari, Khashayar
    2020-07-31 | PDF
    The supply of conventional supplementary cementitious materials (SCMs such as coal fly ash and ground granulated blast furnace slag) continues to fall further behind the concrete industry’s demand to produce durable and sustainable concretes. As an alternative, interest in nontraditional pozzolanic materials continues to grow. This study evaluated ...
  • CTDOT Pavement Design Handbook
    CTDOT Pavement Design Handbook
    Zinke, Scott ;
    Larsen, Donald
    2020-07-28 | PDF
    This document presents the process and methodology for pavement designs in conformance with CT DOT design practices including new construction, rehabilitation, and preservation. Types of pavements addressed include flexible [asphalt concrete] pavements, rigid [Portland cement concrete] pavements, and composite pavements. This document addresses des ...
  • Connected Vehicle Pilot Deployment Concept Phase 1 System Requirements Specification SyRS WYDOT
    Connected Vehicle Pilot Deployment Concept Phase 1, System Requirements Specification (SyRS) – WYDOT
    Gopalakrishna, Deepak ;
    Garcia, Vince
    2020-07-27 | PDF
    The Wyoming Department of Transportation’s (WYDOT) Connected Vehicle (CV) Pilot Deployment Program is intended to develop a suite of applications that utilize vehicle to infrastructure (V2I) and vehicle to vehicle (V2V) communication technology to reduce the impact of adverse weather on truck travel in the I-80 corridor. These applications support ...
  • Operational Applications of Signalized Offset TIntersections
    Operational Applications of Signalized Offset T-Intersections
    Cunningham, Christopher M. ;
    Warchol, Shannon
    2020-07-22 | PDF
    NCDOT maintains a significant number of T intersections with developable land occupying the vacant fourth leg. When a need for a fourth leg is established, NCDOT must determine the optimal location of the leg. Common options include adding the leg to the existing intersection as well as moving the leg up or downstream of the existing intersection t ...
  • Resilient and Dynamic Modulus Testing For ME Pavement Design
    Resilient and Dynamic Modulus Testing For M-E Pavement Design
    Lingwall, Bret
    2020-07-21 | PDF
    This project was originally funded with Principle Investigator (PI) Dr. Soonkie Nam, with Dr. Bret Lingwall as co-PI serving in a support role. The project began in late 2015, and the project was turned over to Dr. Lingwall as PI when Dr. Nam left SDSMT in August of 2017. Due to insurmountable equipment malfunctions, none of the dynamic modulus or ...
  • Understanding Access to Grocery Stores in Food Deserts in Baltimore City
    Understanding Access to Grocery Stores in Food Deserts in Baltimore City
    Chavis, Celeste ;
    Jones, Anita
    2020-07-21 | PDF
    As American cities have seen a change in land uses in urban areas, with stores moving to suburban areas increasing the reliance on cars, many urban areas are left with a lack of accessible quality food options. These food insecure areas, commonly known as food deserts, where residents lack both access and sufficient economic resources to purchase h ...
  • Development of a MASH Test Level 4 Steel SideMounted BeamandPost Bridge Rail
    Development of a MASH Test Level 4 Steel, Side-Mounted, Beam-and-Post, Bridge Rail
    Pena, Oscar ;
    Faller, Ronald K.
    2020-07-20 | PDF
    A new steel, side-mounted, beam-and-post, bridge rail was designed, crash-tested, and evaluated according to safety performance guidelines included in the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware, Second Edition (MASH 2016) for Test Level 4 (TL-4). The new bridge rail system was designe ...
  • Development of Iowa DOT Combination Bridge Separation Barrier with Bicycle Railing Phase II
    Development of Iowa DOT Combination Bridge Separation Barrier with Bicycle Railing – Phase II
    Bielenberg, Robert W. ;
    Benson, Michael K
    2020-07-17 | PDF
    A combination bridge rail was designed and crash tested for Iowa Department of Transportation (Iowa DOT) for use alongside a pedestrian/bicycle bridge pathway that would satisfy Manual for Assessing Safety Hardware (MASH) 2016 Test Level 2 (TL-2) criteria. Currently, Iowa DOT employs a combination bridge rail that utilizes a concrete parapet that h ...
  • MASH 2016 Evaluation of the Modified Thrie Beam System
    MASH 2016 Evaluation of the Modified Thrie Beam System
    Bielenberg, Robert W. ;
    Faller, Ronald K.
    2020-07-16 | PDF
    This report documents the evaluation of the New Jersey Department of Transportation (NJDOT) modified thrie beam (MTB) system in both a single-sided roadside configuration and a dual-sided median configuration under Manual for Assessing Safety Hardware 2016 (MASH 2016) Test-Level 3 (TL-3) criteria. The MTB system was previously tested and approved u ...
  • Effects of Charging Infrastructure Characteristics on Electric Vehicle Preferences of New and Used Car Buyers in the United States [supporting datasets]
    MacKenzie, Don
    ORCID ICON IMG
    2020-07-15 | ZIP
    The used car market is a critical element for the mass adoption of electric vehicles (EVs). However, most previous studies on EV adoption have focused only on new car markets. This article examines and compares the effects of charging infrastructure characteristics on the preferences for EVs among both new and used car buyers. This study is based o ...
    Dataset Supporting Files
  • Durable and Sustainable Concrete Through Performance Engineered Concrete Mixtures
    Durable and Sustainable Concrete Through Performance Engineered Concrete Mixtures
    Cavalline, Tara L ;
    Tempest, Brett Q
    2020-07-13 | PDF
    As funds to construct, maintain, and preserve our highway infrastructure become increasingly stretched, it is imperative that the criteria for selection of concrete mixtures and acceptance of placed concrete reliably ensure durability. Over the past several decades, research has led to new understanding of deterioration mechanisms, advancements in ...
  • Review and Refinement of SDDOTs LRFD Shallow Foundation Design Method
    Review and Refinement of SDDOT’s LRFD Shallow Foundation Design Method
    Lingwall, Bret ;
    Nam, Soonkie
    2020-07-09 | PDF
    The objective of this project was to conduct a comprehensive review of Load Resistance Factor Design (LRFD) for bridge and wall shallow foundations. LRFD is a limit state design methodology based on reliability and probability. Specifically, this study investigated the concept, application, and implementation status of LRFD in shallow foundation de ...
  • Electric Fleet Adoption Strategies – Addressing Storage and Infrastructure Needs [supporting datasets]
    Raju, Arun S.K. ;
    Vu, Alexander
    2020-07-09 | ZIP
    Significant electrification of the transportation sector is necessary for the State to achieve several important greenhouse gas (GHG) reduction and renewable energy targets. The State’s electricity generation and transmission capabilities must increase in order to meet the demand generated by increasing levels of fleet electrification. The increase ...
    Dataset Supporting Files
  • Modeling and Enhancing Freight Mobility in the Philadelphia Region
    Modeling and Enhancing Freight Mobility in the Philadelphia Region
    Qian, Sean ;
    Choudhry, Arnav
    2020-07-07 | PDF
    This research project analyzes freight transportation data and enhances the regional freight transportation model to better estimate and forecast truck travel in the Philadelphia region. In particular, this project infers truck activity from global positioning system (GPS) traces data (acquired by Delaware Valley Regional Planning Commission). Iden ...
  • Labeling Roads with Different Types of Automated Driving Functional Requirements using Machine Learning
    Labeling Roads with Different Types of Automated Driving Functional Requirements using Machine Learning
    Zhao, Ding ;
    Xu, Mengdi
    2020-07-07 | PDF
    Automated vehicles (AVs) should be deployed gradually and geometrically selectively to ensure safety. Frequent collisions of AVs in certain driving scenarios, such as in dark streets or crowded areas, have posed wide concerns of AV safety. People want to know what kinds of driving circumstances or areas are easy for AVs and what are relatively hard ...
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