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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 6841 - 6860 of 36104 results
  • Use of Communication Technologies to Enhance Public Involvement in Transportation Projects
    Use of Communication Technologies to Enhance Public Involvement in Transportation Projects
    Alluri, Priyanka ;
    Nafis, Sajidur
    2018-06-01 | PDF
    Public involvement, especially during the Project Development and Environment (PD&E) phase, is key to developing projects that meet the community needs and desires and reduce the risks of litigation that could result in costly project delays. Active participation from people from all backgrounds and cultures is required to ensure that all points of ...
    Supporting Files
  • Evaluation of the Effects of Deicers on Concrete Durability
    Evaluation of the Effects of Deicers on Concrete Durability
    Xiao, Danny X. ;
    Owusu-Ababio, Samuel
    2018-06-01 | PDF
    The objectives of this study were to identify the use of different deicing and anti-icing materials in Wisconsin, and to investigate whether and how the currently used snow and ice control materials adversely affect concrete durability. Tasks completed in this project were a literature review, survey, existing data assembly and analyses, and field ...
  • Development of a Sinkhole Risk Evaluation Program
    Development of a Sinkhole Risk Evaluation Program
    Nam, Boo Hyun ;
    Shamet, Ryan
    2018-06-01 | PDF
    Sinkholes are a complex, natural problem that requires the understanding of multiple disciplines such as geology, geochemistry, groundwater, and geotechnical engineering. The goal of this proposed research is to develop an integrated program that can evaluate the level of sinkhole risk (or vulnerability) so that geotechnical engineers are properly ...
  • Evaluating the Impacts of Red Light Camera Deployment on Intersection Traffic Safety
    Evaluating the Impacts of Red Light Camera Deployment on Intersection Traffic Safety
    Park, Sung Yoon ;
    Lan, Chien-Lun
    2018-06-01 | PDF
    Red-light cameras (RLC) are a popular countermeasure to reduce red-light running and improve intersection safety. Studies show that the reduction in side impact crashes at RLC intersections are often accompanied by no-change or an increase in the number of rear-end collisions. Part I of the study used crash data to evaluate twenty-seven RLC locatio ...
    Supporting Files
  • Fleet Management Tools for Local Agencies
    Fleet Management Tools for Local Agencies
    Johnson, Ann M. ;
    Kurth, Jeff
    2018-06-01 | PDF
    The increasing cost of buying and maintaining equipment and vehicles is changing how local agencies manage their fleets. The most effective way to optimize the life of vehicles and equipment is through good fleet management. The goal of this guidebook is to describe what that is, and assess and describe the types of software and tools available for ...
  • Development of a Rock Strength Database
    Development of a Rock Strength Database
    Folta, Brian ;
    Sharpe, Jacob
    2018-06-01 | PDF
    Rock strength and elastic behavior are important for foundations such as spread footings resting on rock and drilled shafts socketed into rock. In addition to traditional rock quality information, stiffness and failure parameters are helpful for design. MnDOT has previously used a low-capacity load frame for routine rock testing but this apparatus ...
  • Alternative ABC Connection for Connecting Precast Column to Cap Beam Using UHPC
    Alternative ABC Connection for Connecting Precast Column to Cap Beam Using UHPC
    Shafieifar, Mohamadreza
    2018-06-01 | PDF
    Accelerated Bridge Construction (ABC) is a paradigm change in delivery of bridges. ABC minimizes the traffic interruption, enhances safety to public and workers by significantly reducing onsite construction activities and results in longer lasting bridges. The use of precast elements is gaining attention owing to inherent benefits of accelerated co ...
  • The Use of Mt Mazama Volcanic Ash as Natural Pozzolans for Sustainable Soil and Unpaved Road Improvement
    The Use of Mt. Mazama Volcanic Ash as Natural Pozzolans for Sustainable Soil and Unpaved Road Improvement
    Sleep, Matthew D. ;
    Masley, Morgan
    2018-06-01 | PDF
    This report investigates the viability of using volcanic ash deposited from the eruption of Mt. Mazama as a natural pozzolan and substitute for the more conventional methods of soil stabilization and unpaved roadway improvement, including dust abatement. Chemical analyses show that Mt. Mazama volcanic ash has similar chemistry to that found in many ...
  • Evaluation of Porous Asphalt Used at a Virginia Department of Transportation Park Ride Facility
    Evaluation of Porous Asphalt Used at a Virginia Department of Transportation Park & Ride Facility
    Fitch, G. Michael ;
    Bowers, Benjamin F.
    2018-06-01 | PDF
    Recognizing the increasing emphasis on reducing stormwater runoff associated with transportation facilities and the changes in the Virginia Department of Environmental Quality’s Stormwater Management Program Permit Regulations, the Virginia Department of Transportation (VDOT) has taken the first step in examining ways in which permeable pavements c ...
  • Investigation of Binder Aging and Mixture Performance in Service Reclaimed Asphalt Pavement Mixtures
    Investigation of Binder Aging and Mixture Performance in Service: Reclaimed Asphalt Pavement Mixtures
    Diefenderfer, Stacey D ;
    Nair, Harikrishnan
    2018-06-01 | PDF
    In 2007, the Virginia Department of Transportation piloted a specification allowing up to 30% reclaimed asphalt pavement (RAP) in certain dense-graded asphalt surface mixtures while changing virgin binder grade requirements. The change affected only mixtures requiring an end binder grade of either PG 64-22 or PG 70-22. For mixtures specifying PG 64 ...
  • Utilization of AVLGPS Technology Case Studies
    Utilization of AVL/GPS Technology: Case Studies
    Lee, Ming-Shiun ;
    Nelson, Dan
    2018-06-01 | PDF
    Winter road maintenance accounts for roughly 20 percent of state DOT maintenance budgets. State and local agencies spend over $2.3 billion on winter operations annually. As such, effective winter maintenance operations incorporating smart uses of methods, techniques, technologies, equipment and materials becomes essential. Among various winter main ...
  • Evaluation of Different Types of Waterproofing Membranes Asphaltic and NonAsphaltic as Cost Effective Bridge Deck Barriers in Reducing Corrosive Chloride Effects
    Evaluation of Different Types of Waterproofing Membranes (Asphaltic and Non-Asphaltic) as Cost Effective Bridge Deck Barriers in Reducing Corrosive Chloride Effects
    Li, Linfei ;
    Xi, Yunping
    2018-06-01 | PDF
    In the past several decades, reinforced concrete structures have deteriorated similarly by chemical attack, especially chloride attack. For highway bridges, this phenomenon becomes more severe since bridges are exposed to extreme environmental conditions, such as snow and ice. In an effort to better protect the bridge decks and reduce maintenance c ...
  • Models of Driving Simulator Assessment of Adaptive Cruise Control Conceptual Understanding
    Models of Driving: Simulator Assessment of Adaptive Cruise Control Conceptual Understanding
    DeVane, Benjamin ;
    Moore, Joyce
    2018-06-01 | PDF
    Drivers have poor conceptual understanding of new adaptive driver safety systems (ADAS) such as adaptive cruise control (ACC). When using advanced safety systems, older drivers tend to be more open to learning through reading manuals, but also tend to struggle with learning the uses and limitations of a safety system. Different instructional format ...
  • Mechanical Response of a Composite Steel ConcreteFilled Pile
    Mechanical Response of a Composite Steel, Concrete-Filled Pile
    Hu, Chen ;
    Sharpe, Jacob
    2018-06-01 | PDF
    A steel pipe-pile section, filled with concrete, was instrumented and tested under axial load. Two types of strain gages, resistive and vibrating wire, were mounted to the steel-pipe pile and checked by determining the known Young’s modulus of steel Es. The steel section was filled with concrete and a resistive embedment gage was placed in the conc ...
  • Prioritization of WildlifeVehicle Conflict in Nevada
    Prioritization of Wildlife-Vehicle Conflict in Nevada
    Cramer, Patricia ;
    McGinty, Christopher
    2018-06-01 | PDF
    In Nevada each year vehicle collisions with wild and domestic-feral animals result in an average of over 500 reported crashes, cost the Nevada public over $19 million in crash costs, and kill an estimated 5,032 wild animals. While Nevada constructed several dozen wildlife mitigation features to help reduce these crashes and provide wildlife connect ...
  • MnDOT Autonomous Bus Pilot Project Testing and Demonstration Summary
    MnDOT Autonomous Bus Pilot Project Testing and Demonstration Summary
    Borgen, Janelle ;
    Taavola, Daryl
    2018-06-01 | PDF
    To better prepare for the operations of an automated shuttle bus in mixed general traffic and in Minnesota cold weather climate conditions, MnDOT is conducting an Autonomous Bus Pilot project. The purpose of the proposed Minnesota Autonomous Bus Pilot project is to define an automated vehicle pilot and solicit technology partners to come to Minneso ...
  • Evaluating Cell Phone Data for AADT Estimation
    Evaluating Cell Phone Data for AADT Estimation
    Codjoe, Julius ;
    Ashley, Grace
    2018-06-01 | PDF
    AADT estimation facilitates the process of determining and prioritizing funds for both road safety and improvement projects. Traffic counts over non-state roadways are normally the responsibility of local governments and the Metropolitan Planning Organizations of Louisiana’s major cities. Other non-state roadways in rural and small urban areas do n ...
    Supporting Files
  • Extent and Impacts of the Virginia Department of Transportations Exception Process for Access Management Design Standards
    Extent and Impacts of the Virginia Department of Transportation’s Exception Process for Access Management Design Standards
    Miller, John S. ;
    Dougald, Lance E.
    2018-06-01 | PDF
    The Virginia Department of Transportation (VDOT) Road Design Manual requires that new commercial entrances meet certain minimum spacing standards depending on a facility’s speed limit and functional classification. Landowners, however, may request an exception from these standards, leading to two questions relevant for Virginia’s access management ...
  • Designing CrossSubsidy Mechanisms for MultiModal Transportation Systems
    Designing Cross-Subsidy Mechanisms for Multi-Modal Transportation Systems
    Chen, Ruoyun ;
    Nozick, Linda K.
    2018-05-31 | PDF
    Despite large investments in passenger transportation infrastructure, congestion has increased at an alarming pace and at substantial societal costs. Congestion was estimated to cost $124 billion in 2013 and to rise to about $186 billion by 2030. Empirical evidence demonstrates that public transit is effective in alleviating congestion as well as t ...
  • Improving Strain Wedge Model Capabilities in Analyzing Large Diameter Drilled Shafts Subjected to Lateral Loading in Cemented Soils
    Improving Strain Wedge Model Capabilities in Analyzing Large Diameter Drilled Shafts Subjected to Lateral Loading in Cemented Soils
    Elfass, Sherif ;
    Saint-Pierre, Evan
    2018-05-31 | PDF
    Cemented soils deposits located in Las Vegas valley have long been a challenge for engineers. These deposits can withstand considerable loads. They are, however, difficult to model or predict using typical site investigation techniques. For engineering purposes, these cemented soils, also commonly referred to as Caliche, are difficult to quantify t ...
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