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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 36908 results
  • Frost Susceptibility and Strength of CementTreated FineGrained Soils
    Frost Susceptibility and Strength of Cement-Treated Fine-Grained Soils
    Bray, Matthew T ;
    Darrow, Margaret M.
    2020-12-01 | PDF
    Cement treatment is one way to improve the strength and stability of embankment materials when high-quality aggregate is not available. Concerns with using cement-treated fine-grained soils are potential frost susceptibility and subsequent thaw weakening. Previous research on this topic suggests that cement treatments of 3% to 4% are generally suff ...
  • Use of JBand To Improve the Performance of the HMA Longitudinal Joint
    Use of J-Band To Improve the Performance of the HMA Longitudinal Joint
    Williams, R. Christopher ;
    Podolsky, Joseph
    2020-12-01 | PDF
    The density and air void content of asphalt mixtures affect the durability and performance of asphalt pavements. Pavement longitudinal joints typically have a lower density than the mat because they receive less compaction than the center section of the mat for various reasons. The higher air void percentages resulting from lower densities can lead ...
  • Hybrid Prestressed Concrete Bridge Girders using UltraHigh Performance Concrete
    Hybrid Prestressed Concrete Bridge Girders using Ultra-High Performance Concrete
    Torres, Eduardo ;
    Hamilton, H. R.
    2020-12-01 | PDF
    In prestressed bridge girders, end region reinforcement and strand debonding are used to control cracking caused by high tensile stresses that occur due to prestress transfer. In some cases, these measures do not effectively control cracking, resulting in construction delays, potential repairs, additional costs, and potential compromise of long-ter ...
  • Holistic Networklevel Assessment of Pavement Flood Damages
    Holistic Network-level Assessment of Pavement Flood Damages
    Lee, Yong-Cheol ;
    Choi, Kunhee
    2020-12-01 | PDF
    After recent catastrophic flood disasters in Louisiana in 2016 and Texas in 2017, roadways in Region 6 areas suffer not only from the flood-inundation, but also from the long-term recovery processes that incur enormous maintenance costs. To assess the impacts of flooding disasters on roadways, various studies have investigated sampled roadway damag ...
  • Intersection on Horizontal Curves Problems and Potential Solutions
    Intersection on Horizontal Curves: Problems and Potential Solutions
    Sun, Xiaoduan ;
    Sun, Ming
    2020-12-01 | PDF
    Horizontal curves and intersections pose challenges to drivers and other roadway users because of their unique design and function, which is why both features have been recognized as the target areas for safety improvement in many states’ highway safety strategies. There is little research on assessing safety of intersections on horizontal curves. ...
  • Development of a Statewide Landslide Inventory Database for Idaho
    Development of a Statewide Landslide Inventory Database for Idaho
    Lifton, Zachery M ;
    Ducar, Scott D
    2020-12-01 | PDF
    Landslide inventory databases are fundamental tools for documenting and assessing slope stability hazards. They are often used by emergency managers and government agencies to catalog the location and contributing factors of landslides, and to prioritize mitigation efforts. Prior to this project, Idaho did not have a comprehensive, public landslide ...
  • RAP Reset Responsibly Optimizing Recycled Materials Use in AC and Pavement Performance Life
    RAP Reset – Responsibly Optimizing Recycled Materials Use in AC and Pavement Performance Life
    Hand, Adam J. T. ;
    Muench, Stephen T.
    2020-12-01 | PDF
    The durability performance of Asphalt Concrete (AC) with various percentages of Reclaimed Asphalt Material (RAM) has been a focal point of the asphalt industry leading it to embrace the Balanced Mix Design (BMD) concept. The goal of this research was to review and enhance Washington State Department of Transportation (WSDOT) AC materials selection, ...
  • Modeling EHailing and CarPooling Services in a Coupled Morning Evening Commute Framework
    Modeling E-Hailing and Car-Pooling Services in a Coupled Morning- Evening Commute Framework
    Pang, Jong-Shi ;
    Zhang, Michael
    2020-12-01 | PDF
    In this research project, we develop a general equilibrium model to capture the complex interactions between solo-driving, rideshare and e-hailing that allows travelers to switch between different transportation modes in a coupled morning-evening commute. The model is formulated as a mixed complementarity problem. The existence of an equilibrium so ...
  • Demonstration and InterComparison of Seasonal Weight Restriction Models Phase II
    Demonstration and Inter-Comparison of Seasonal Weight Restriction Models - Phase II
    Miller, Heather ;
    Berg, Richard L
    2020-12-01 | PDF
    Many miles of roads are in seasonal frost areas that are highly susceptible to damage during the spring thaw period. As freezing occurs from the surface downward, moisture is drawn toward the freezing front, ice lenses are formed, and the roadways become stronger. When the ice lenses (above still-frozen underlying layers) melt, the structure is lef ...
  • Urban Connector Year 3 Field Tests
    Urban Connector Year 3: Field Tests
    Cheu, Ruey Long ;
    Chow, Joseph
    2020-12-01 | PDF
    C2SMART has supported researchers at The University of Texas at El Paso (UTEP) in collaboration with researchers at New York University (NYU), and with the engagement of the City of El Paso’s Parks & Recreation Department for the development of an Android-based smartphone application named Urban Connector (UC), from March 2017 to February 2019. The ...
  • Evaluating Louisiana New Continuity Detail for Girder Bridges
    Evaluating Louisiana New Continuity Detail for Girder Bridges
    Okeil, Ayman M. ;
    Canales, Marco
    2020-12-01 | PDF
    This report summarizes results from an investigation of the behavior of link slabs as a means for achieving partial bridge continuity. Data collected over a period of three years from a structural health monitoring system installed in the Ouachita River Bridge was used to study link slab behavior. Multiple spans with various continuity details and ...
  • Appendices Clear Roads Project 1803 Evaluation of SSI and WSI Variables
    Appendices: Clear Roads Project 18-03 Evaluation of SSI and WSI Variables
    Sturges, Leigh ;
    Fay, Laura
    2020-12-01 | PDF
    The appendices for Clear Roads report CR18-03, Evaluation of SSI and WSI Variables," published December 2020.
  • Toward a Guide for Smart Mobility Corridors Frameworks and Tools for Measuring Understanding and Realizing Transportation Land Use Coordination
    Toward a Guide for Smart Mobility Corridors: Frameworks and Tools for Measuring, Understanding, and Realizing Transportation Land Use Coordination
    Appleyard, Bruce S. ;
    Stanton, Jonathan
    2020-12-01 | PDF
    The coordination of transportation and land use (also known as “smart growth”) has been a long-standing goal for planning and engineering professionals, but to this day it remains an elusive concept to realize. Leaving us with this central question -- how can we best achieve transportation and land use coordination at the corridor level? In respons ...
  • Nebraska Rail Crossing Safety Research
    Nebraska Rail Crossing Safety Research
    Khattak, Aemal ;
    Kang, Yashu
    2020-12-01 | PDF
    The research objectives of this project were to update Nebraska Department of Transportation (NDOT) 1999 Nebraska Accident Prediction Model for Highway-Rail Grade Crossings (HRGCs) and to develop guidelines using Lancaster County Nebraska HRGCs for improving safety at urban gated HRGCs that are not designated quiet zones but are in the vicinity of ...
  • AgentBased Modeling of Emergency Management Networks With Public Mobilization After a Disaster
    Agent-Based Modeling of Emergency Management Networks With Public Mobilization After a Disaster
    Fischer, Erica ;
    Wang, Haizhong
    2020-12-01 | PDF
    Local, state, and federal governments are responsible for managing disaster response with the goal of increasing disaster resilience of a community. This includes continuing adequate service levels for critical infrastructure sectors, reducing response time and cost, and ensuring the ongoing safety of the community. Complex emergency management sys ...
  • Investing in Californias Transportation Future Public Opinion on Critical Needs
    Investing in California’s Transportation Future: Public Opinion on Critical Needs
    Agrawal, Asha Weinstein ;
    Nixon, Hilary
    2020-12-01 | PDF
    In 2017, the State of California adopted landmark legislation to increase the funds available for transportation in the state: Senate Bill 1 (SB1), the Road Repair and Accountability Act of 2017. Through a combination of higher gas and diesel motor fuel taxes, SB1 raises revenue for four critical transportation needs in the state: road maintenance ...
  • Development of a Systemic Safety Improvement Plan for TwoLane Rural Roads in Virginia
    Development of a Systemic Safety Improvement Plan for Two-Lane Rural Roads in Virginia
    Cho, Hyun W. ;
    Cottrell Jr, Benjamin H
    2020-12-01 | PDF
    About 17,500 crashes per year occur on the more than 32,800 lane-miles of undivided two-lane rural roads maintained by the Virginia Department of Transportation (VDOT), and crash numbers are increasing. Roadway departure (RD) crashes comprise about 58% of crashes on these roads. Since these crashes are widely distributed across the state, determini ...
  • Safety Performance of Rural FourLane Undivided Roadways and Rural FourLane Roadways with a TwoWay LeftTurn Lane
    Safety Performance of Rural Four-Lane Undivided Roadways and Rural Four-Lane Roadways with a Two-Way Left-Turn Lane
    Liu, Jun ;
    Penmetsa, Praveena
    2020-12-01 | PDF
    Non-traversable medians consistently yielded improved safety performance compared to other median types such as undivided, 4- feet flush medians, and two-way left-turn lane cross-sections. However, constructing non-traversable medians can be costly. The goal of this study is to 1) examine the safety performance of existing rural four-lane roadways ...
  • Literature Search on Use of Flexible Pipes in Highway Engineering for DOTDs Needs Tech Summary
    Literature Search on Use of Flexible Pipes in Highway Engineering for DOTD’s Needs [Tech Summary]
    Jafari, Navid H ;
    Zhang, Zhongjie
    2020-12-01 | PDF
    The Louisiana Department of Transportation and Development (DOTD), through the Louisiana Standard Specifications of Roads and Bridges, gives a thorough guideline to what is required for the implementation of pipes for culverts and storm drains. The design procedures, design criteria, and implementation process for plastic pipes has been widely inve ...
  • Bridge Decks Mitigation of Cracking and Increased DurabilityMaterials Solution Phase III
    Bridge Decks: Mitigation of Cracking and Increased Durability—Materials Solution (Phase III)
    Deb, Robin ;
    Mondal, Paramita
    2020-12-01 | PDF
    Type K cement offers a lower slump than conventional concrete, even at a higher water-to-cement ratio. Therefore, a suitable chemical admixture should be added to the Type K concrete mix design at a feasible dosage to achieve and retain target slump. In this project, a compatibility study was performed for Type K concrete with commercially availabl ...
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