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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 6701 - 6720 of 36104 results
  • Testing Evaluation and Specification for Polymeric Materials Used for Transportation Infrastructures
    Testing, Evaluation, and Specification for Polymeric Materials Used for Transportation Infrastructures
    Elsafty, Adel ;
    Hsuan, Yick (Grace)
    2018-07-23 | PDF
    Test protocols for material quality assurance are recommended for assessing sunlight degradation of polymeric products used in transportation-related products. One structural plastic product and five detectable warning surface (DWS) products were evaluated using a laboratory xenon weatherometer and exposed to outdoor condition at Gainesville, Flori ...
    Supporting Files
  • Evaluation of Colored VMS Boards
    Evaluation of Colored VMS Boards
    Guler, S. ;
    Kersavage, Kristin
    2018-07-20 | PDF
    Variable message signs (VMS), often referred to as changeable message signs or dynamic message signs, present traffic information to motorists in either-real time or asynchronous static conditions. Typically installed on freeways, VMS can communicate information to motorists that includes early warning messages, advisory messages, or alternative ro ...
  • DataDriven Development of a Roadside Safety Marketing Campaign for Tree Removal Phase I
    Data-Driven Development of a Roadside Safety Marketing Campaign for Tree Removal – Phase I
    Stolle, Cody S. ;
    Ammon, Thomas
    2018-07-17 | PDF
    Since the 1970s, tree crashes have been one of the most common and deadly fixed-object fatal crash types, resulting in more than 3,000 fatal crashes and 3,500 fatalities each year. While fatal tree crashes could be prevented by removing trees adjacent to the roadway, an extensive national tree removal project would be unnecessary, cost-prohibitive, ...
  • Evaluating the Impacts of Driver Cognitive and Physiological State on Decision Making Behavior under Real Time Travel Information
    Evaluating the Impacts of Driver Cognitive and Physiological State on Decision Making Behavior under Real Time Travel Information
    Agrawal, Shubham ;
    Benedyk, Irina
    2018-07-16 | PPT
    Evaluating driver cognitive state under real-time travel information provision using physiological factors and its impacts on route choice behavior [Paper presentation]. 15th International Conference on Travel Behavior Research (IATBR), Santa Barbara, CA.
  • Visibility Standards for Field Worker Apparel and Personal Protective Equipment
    Visibility Standards for Field Worker Apparel and Personal Protective Equipment
    Chow, Stan
    2018-07-16 | PDF
    California Department of Transportation (Caltrans) has recently made a new style, orange-based, retroreflective personal protective equipment (PPE) available to its employees. This research project was to evaluate whether the new orange-based PPE is as visible and effective as the replaced, yellow-based retroreflective PPE. To make the comparisons, ...
  • Transportation Mobility Among LowIncome Transportation Disadvantaged Older Adults Living in a Low Density Urban Environment Using Innovative Data Collection Methods
    Transportation Mobility Among Low-Income, Transportation Disadvantaged Older Adults Living in a Low Density Urban Environment Using Innovative Data Collection Methods
    Mattingly, Stephen P. ;
    Fields, Noelle
    2018-07-11 | PDF
    This study investigates the transportation disadvantage that low-income, older adults face on an individual basis. To accomplish this, research team members custom designed an innovative “travel diary” app, MyAmble, which tracks planned, completed, failed/uncompleted trips, and unserved trips in its Trip Planner module. In addition to the typical t ...
  • Analysis of AddressBased Employment and Demographic Data Sources For Travel Modeling and Transportation Planning
    Analysis of Address-Based Employment and Demographic Data Sources For Travel Modeling and Transportation Planning
    Sullivan, James
    ORCID ICON IMG
    2018-07-10 | PDF
    Marketing support firms compile consumer and business data to provide business-to-business and business-to-consumer products. These firms sell the most up-to-date data to companies for marketing campaigns, through mailing, emailing, and other solicitations to potential customers. Two of the largest and most established providers of this type of dat ...
  • Technical Memo Concrete Pay Factor Analysis
    Technical Memo – Concrete Pay Factor Analysis
    Sullivan, Jim ;
    Novak, David C.
    2018-07-06 | PDF
    This memo documents the results of efforts by the UVM research team to develop an initial set of pay factors for payment of in-place concrete by the Vermont Agency of Transportation’s Materials Testing & Certification Lab. The project consisted of employing a search heuristic to establish a variety of pay-incentives for synthetic data representing ...
  • Advancing Understanding of LongDistance and Intercity Travel With Diverse Data Sources
    Advancing Understanding of Long-Distance and Intercity Travel With Diverse Data Sources
    Dowds, Jonathan ;
    Harvey, Chester
    2018-07-04 | PDF
    Long-distance travel is an ambiguous designation that is used to refer to an extremely diverse set of trips, differing from one another in mode, distance, and purpose. Long-distance travel encompasses everything from "short" long-distance surface trips between adjacent metropolitan areas through intercontinental air trips spanning thousands of mile ...
  • Remaining Service Life Asset Measure Phase 1
    Remaining Service Life Asset Measure, Phase 1
    Marasteanu, Mihai ;
    Kumar, Ravi
    2018-07-04 | PDF
    There is a critical need to use a common metric, such as a service life parameter, across many different types of infrastructure assets. MnDOT has used the remaining service life (RSL) measure for pavement condition for several years and is starting to use it for bridge condition. In this study, researchers examined what has been done to date and w ...
  • Development of New Design Guidelines for Protection against Erosion at Bridge Abutments
    Development of New Design Guidelines for Protection against Erosion at Bridge Abutments
    Constantinescu, George
    ORCID ICON IMG
    2018-07-04 | PDF
    Over the last two decades, the United States Midwest has experienced increasingly catastrophic flood events. Severe erosion problems occurred even though the erosion protection design measures for bridge abutments and their embankments followed the existing guidelines (e.g., HEC 23, 2001 and following updates through 2009). The methodology proposed ...
  • Using SHRP2Nds Data to Investigate Freeway Operations Human Factors and Safety Final Report
    Using SHRP2-Nds Data to Investigate Freeway Operations, Human Factors, and Safety: Final Report
    Avelar, Raul Eduardo ;
    Dadashova, Bahar
    2018-07-04 | PDF
    This project identified and quantified relationships between traffic operations variables (such as operating speeds), human factors characteristics (e.g., driver demographics), and safety variables (crash or near-crash outcome) making use of the recently available SHRP2 databases. Researchers studied driver performance and investigated how the oper ...
  • Preventive Maintenance Study Final Report
    Preventive Maintenance Study: Final Report
    Anderson, Keith W. ;
    Weston, Jim.
    2018-07-04 | PDF
    This final 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 plus crack sealing and dig outs plus full lane chip seal ...
  • Application of MechanisticEmpirical Pavement Design Approach into RCC Pavement Thickness Design Research Project Capsule 191P
    Application of Mechanistic-Empirical Pavement Design Approach into RCC Pavement Thickness Design: Research Project Capsule [19-1P]
    Wu, Zhong
    2018-07-04 | PDF
    The objectives of this research are to investigate factors that may impact RCC pavement performance (e.g., mix design and joint spacing), evaluate the cracking mechanism and joint performance of RCC pavements over different stabilized base materials, develop performance prediction curves suitable for use during thickness design of RCC pavements, de ...
  • Investigating Available StateoftheArt Technology for Determining Needed Information for Bridge Rating Strategies Research Project Capsule 185ST
    Investigating Available State-of-the-Art Technology for Determining Needed Information for Bridge Rating Strategies: Research Project Capsule [18-5ST]
    Lindyberg, Robert F.
    2018-07-04 | PDF
    This research will investigate technologies that can be used for determining bridge information that is not available in design or construction records. Examples include items related to bridge geometry (length, width, member dimensions); strength of bridge materials (concrete, steel); and locations of reinforcement.
  • Determining Concrete Chloride Permeability Rapidly and Effectively
    Determining Concrete Chloride Permeability Rapidly and Effectively
    Crouch, L. K. ;
    Badoe, Daniel
    2018-07-03 | PDF
    A study was conducted to determine if chloride permeability could be determined more quickly and efficiently. Two mixtures were selected by the Tennessee Department of Transportation (TDOT) Materials and Tests (M&T) Division: a TDOT Class D mixture with 20% Class F fly ash and an experimental mixture containing 35% Grade 120 slag and 15% Class F fl ...
  • Detecting Driver Distraction
    Detecting Driver Distraction
    Eskenazi, Maxine ;
    Black, Alan W.
    2018-07-02 | PDF
    It is well known that texting during driving causes divided attention, higher cognitive load and accidents. At the same time, many people feel that hands-free talking on the phone is not dangerous. Yet the same type of effort (understanding a conversation, figuring out what to say, feeling emotions, etc.) is present when speaking. While it might be ...
  • Strategic Planning and Design for Electric Bus Systems
    Strategic Planning and Design for Electric Bus Systems
    Wei, Ran ;
    Liu, Xiaoyue Cathy
    2018-07-01 | PDF
    Environmental concerns due to fossil fuel consumption and emissions drive transportation industry to shift towards low-impact and sustainable energy sources. Public transit system, as an integral part of multimodal transportation ecosystem, has been supporting such a shift by exploring the adoption of electric vehicles. In recent years, the advance ...
  • CommunityBased Assessment of Smart Transportation Needs in the City of Portland
    Community-Based Assessment of Smart Transportation Needs in the City of Portland
    Golub, Aaron ;
    Serritella, Michael
    2018-07-01 | PDF
    The Portland Smart Cities UB Mobile PDX proposal focuses strongly on developing mobility solutions that would serve traditionally underserved populations (low-income, communities of color, and residents with mobility challenges). As the proposal now moves into a plan, this project explores and assesses the transportation challenges in traditionally ...
  • Bringing Smart Transport to Texans Ensuring the Benefits of a Connected and Autonomous Transport System in Texas Phase 2
    Bringing Smart Transport to Texans : Ensuring the Benefits of a Connected and Autonomous Transport System in Texas (Phase 2)
    Kockelman, Kara M. ;
    Boyles, Stephen D.
    2018-07-01 | PDF
    This project develops and demonstrates a variety of smart-transport technologies, policies, and practices for highways and freeways using connected autonomous vehicles (CAVs), smartphones, roadside equipment, and related technologies. The intent is to maximize the benefit of these technologies in terms of improved driver safety, reduced congestion, ...
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