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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 3241 - 3260 of 36873 results
  • Evaluation of Asphalt Rubber and Reclaimed Tire Rubber in Chip Seal Applications
    Evaluation of Asphalt Rubber and Reclaimed Tire Rubber in Chip Seal Applications
    Elseifi, Mostafa A. ;
    Rahman, Nafiur
    2022-04-01 | PDF
    Chip sealing is a commonly used pavement maintenance technique that aims to delay pavement deterioration by reducing water infiltration and restoring skid resistance. The aim of this study was to characterize the chemical, molecular, and rheological properties of different asphalt emulsions, evaluate their laboratory performance, short-term field p ...
  • A Strategic Assessment of Needs and Opportunities for the Wider Adoption of Electric Vehicles in Indiana
    A Strategic Assessment of Needs and Opportunities for the Wider Adoption of Electric Vehicles in Indiana
    Konstantinou, Theodora ;
    Chen, Donghui
    2022-04-01 | PDF
    The primary objective of this study was to assess the challenges and opportunities associated with the provision of appropriate infrastructure to support electric vehicle (EV) operations and electrification across Indiana. A secondary objective of this study was to develop a strategic plan for INDOT that outlines new business opportunities for deve ...
  • Using Automated Vehicle AV Technology to Smooth Traffic Flow and Reduce Greenhouse Gas Emissions
    Using Automated Vehicle (AV) Technology to Smooth Traffic Flow and Reduce Greenhouse Gas Emissions
    Almatrudi, Sulaiman ;
    Parvate, Kanaad
    2022-04-01 | PDF
    Passenger and heavy-duty vehicles make up 36% of California’s greenhouse gas (GHG) emissions. Reducing emissions from vehicular travel is therefore paramount for any path towards carbon neutrality. Efforts to reduce GHGs by encouraging mode shift or increasing vehicle efficiency are, and will continue to be, a critical part of decarbonizing the tra ...
  • Feasibility and Performance of LowVolume Roadway Mixture Design
    Feasibility and Performance of Low-Volume Roadway Mixture Design
    Mayeux, Corey R ;
    Salari, Saman
    2022-04-01 | PDF
    The typical low-volume project in Louisiana is mill and replace (~2 in.) with no base repair. The less than ideal base conditions often lead to density variations in the asphalt wearing course. The 2016 Louisiana Department of Transportation and Development specification based pay for asphalt tonnage on density under a percent within limits (PWL) p ...
  • Assessing the Travel Demand and Mobility Impacts of Transformative Transportation Technologies in Indiana
    Assessing the Travel Demand and Mobility Impacts of Transformative Transportation Technologies in Indiana
    Luo, Hao ;
    Chahine, Ricardo
    2022-04-01 | PDF
    The rapid development of transformative transportation technologies, such as bike-sharing, shared e-scooters, and ridehailing systems, is reshaping the transportation landscape. These transformative transportation technologies have the potential to significantly change travel behavior and travel demand and affect transportation agencies’ planning, ...
  • Design and MASH TL3 Evaluation of Surface Mounted Median Guardrail
    Design and MASH TL-3 Evaluation of Surface Mounted Median Guardrail
    Sheikh, Nauman M. ;
    Bligh, Roger P.
    2022-04-01 | PDF
    This report presents the development and crash testing of a surface-mounted median guardrail on concrete. The research team developed several preliminary design concepts of the median guardrail. One of these was selected by the Texas Department of Transportation for further development through finite element simulation analysis and full-scale crash ...
  • Determining the True Cost and Benefit for Collecting and Maintaining NonRoad and NonBridge Asset Data
    Determining the True Cost and Benefit for Collecting and Maintaining Non-Road and Non-Bridge Asset Data
    Stopher, Peter R. ;
    Bian, Ruijie
    2022-04-01 | PDF
    The purpose of this project was to develop a method that could be used to assess the costs and benefits of collecting and maintaining a database on any asset of DOTD, to aid in determining for which assets it was worthwhile to collect data. The literature review established that a methodology for doing this does not already exist. The literature re ...
  • The Impacts of Deferred Maintenance in Minnesota
    The Impacts of Deferred Maintenance in Minnesota
    Fonseca-Sarmiento, Camila ;
    Zeerak, Raihana
    2022-04-01 | PDF
    The roadway system is critical to social development, economic growth, and the overall quality of life. In the U.S., the condition of highways and roads is being compromised due to several reasons including age deterioration, rising costs of construction, and a decline in funding. Similarly, in Minnesota, the majority of pavements are aging and in ...
  • Improving Winter Maintenance for Open Graded Friction Course OGFC Pavements in Tennessee
    Improving Winter Maintenance for Open Graded Friction Course (OGFC) Pavements in Tennessee
    Onyango, Mbakisya ;
    Wu, Weidong
    2022-04-01 | PDF
    Open Graded Friction Course (OGFC) is a thin permeable surface layer on pavements constructed to ensure higher air void content that provides drainage from the pavement surfaces. This results in a safer riding surface, especially on wet conditions. OGFC pavements have been reported to reduce about 30% more wet crashes compared to densely graded sur ...
  • Identification of the Mechanisms That Produce Hydrogen Embrittlement on Posttensioning Members and the Effects of Galvanic Coupling on Bridge Tendons
    Identification of the Mechanisms That Produce Hydrogen Embrittlement on Post-tensioning Members and the Effects of Galvanic Coupling on Bridge Tendons
    Alexander, Christopher L ;
    Dukeman, David
    2022-04-01 | PDF
    A preliminary analysis of failed prestressing strands within a post-tensioned tendon on the Wando River Bridge in South Carolina showed signs of possible hydrogen embrittlement. One proposed source of hydrogen is through galvanic coupling that may exist between the galvanized steel duct and the steel strands. This coupling, if present, can promote ...
  • Testing Methods for the Next Generation of Concrete Summary
    Testing Methods for the Next Generation of Concrete [Summary]
    Ruelke, Tim ;
    Ferraro, Christopher
    2022-04-01 | PDF
    University of Florida researchers performed a thorough literature review to identify existing test methods that can quantify the performance of concrete with respect to heat evolution, cracking, and durability at the mix design phase.
  • Stabilized Full Depth Reclamation SFDR Evaluation of Two Stabilization Products BASE ONE and Engineered Emulsion
    Stabilized Full Depth Reclamation (SFDR) – Evaluation of Two Stabilization Products: BASE ONE® and Engineered Emulsion
    Sabouri, Mohammadreza ;
    Wegman, Daniel E.
    2022-04-01 | PDF
    In previous Local Road Research Board (LRRB) studies there has been discussion but no empirical data regarding proprietary stabilizers. The LRRB leveraged an existing rehabilitation project on the border of Beltrami and Hubbard Counties to gather data and report on two stabilizers: engineered emulsion (used on the Beltrami County portion) and BASE ...
  • Development of GDOT UltraHigh Performance Concrete for Bridge Deck Closure Pours
    Development of GDOT Ultra-High Performance Concrete for Bridge Deck Closure Pours
    Stewart, Lauren K ;
    Kahn, Lawrence
    2022-04-01 | PDF
    The use of precast prestressed girders with composite precast deck panels along with the use of precast prestressed deck bulb-T girders provide for more economical bridges because of their ability to utilize accelerated bridge construction techniques. The use of concrete deck panels and deck bulb-T systems require the use of closure pours between t ...
  • Connected Autonomous Vehicles Frequently Asked Questions
    Connected Autonomous Vehicles: Frequently Asked Questions
    Marti, Michael M ;
    Bitzan, Nicole
    2022-04-01 | PDF
    An interactive presentation describing frequently asked questions about Connected and Autonomous Vehicles (CAV). The presentation is divided into five sections: General, Timing/Preparation, Policy/Standardization, Safety, Rural, and Resources.
  • Feasibility and Performance of LowVolume Roadway Mixture Design Tech Summary
    Feasibility and Performance of Low-Volume Roadway Mixture Design [Tech Summary]
    Mayeux, Corey R ;
    Salari, Saman
    2022-04-01 | PDF
    During specification meetings between the Louisiana Department of Transportation and Development (DOTD) and asphalt contractors around the state, a concern was raised regarding the payment methods for low-volume roadways. At the time, DOTD was using the “percent within limits” (PWL) model to determine payment for all roadways.
  • Quantifying Effectiveness and Impacts of Digital Message Signs on Traffic Flow
    Quantifying Effectiveness and Impacts of Digital Message Signs on Traffic Flow
    Kwigizile, Valerian ;
    Oh, Jun-Seok
    2022-03-31 | PDF
    Digital message signs (DMS) are a vital part of the advanced traveler information systems (ATIS) that disseminate various real-time travel information to the road users, including traffic diversion, travel time, congestion, upcoming roadwork, lane closures, and incidents such as accidents. Other information includes inclement weather, speed regulat ...
  • Native Seed Germplasm Study and Development Project
    Native Seed Germplasm Study and Development Project
    Gisler, Melanie ;
    Harris, Scott
    2022-03-31 | PDF
    This four-year study was designed to address the question “can we improve upon standard seed mixes (commercial seed sources used by NMDOT) by including local sources or alternate sources from less frequently used commercially available species or entirely novel species?” Five 1-acre research sites on DOT and private land near the Lordsburg Playa we ...
  • Leveraging UAV Capabilities for Vehicle Tracking and Collision Risk Assessment at Road Intersections
    Leveraging UAV Capabilities for Vehicle Tracking and Collision Risk Assessment at Road Intersections
    Zong, Shuya ;
    Chen, Sikai
    2022-03-29 | PDF
    Transportation agencies continue to pursue crash reduction. Initiatives include the design of safer facilities, promotion of safe behaviors, and assessments of collision risk as a precursor to the identification of proactive countermeasures. Collision risk assessment includes reliable prediction of vehicle trajectories. Unfortunately, in using trad ...
  • Hot Mix Asphalt Research Investigation for Connecticut Final Report
    Hot Mix Asphalt Research Investigation for Connecticut - Final Report
    Zinke, Scott ;
    Mahoney, James
    2022-03-22 | PDF
    Six topics were investigated involving specifications, performance and testing of hot mix asphalt in Connecticut. An investigation into the possible reduction in the number of mix design levels used in CT resulted in a recommendation to eliminate Level 4. An investigation into minimum asphalt contents in CT mixes was halted and commenced under a di ...
  • Infrastructure Protection and Rehabilitation Response to High Lake Levels
    Infrastructure Protection and Rehabilitation Response to High Lake Levels
    Hebebrand, Craig K ;
    Peters, Christopher S
    2022-03-17 | PDF
    This multifaceted planning study addresses risks to MDOT assets associated with high water levels in the Great Lakes, as experienced in 2019 and 2020. The project classifies exposure, vulnerability, and risk for flooding and erosion hazards statewide, focusing on areas hydrologically connected to the Great Lakes. For five priority sites, a conditio ...
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