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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 3561 - 3580 of 36011 results
  • Improving Future of the Commonwealths Curb
    Improving Future of the Commonwealth’s Curb
    Gonzales, Eric J. ;
    Roberts, Shannon C
    2021-06-01 | PDF
    Demands for use of the curb space (curbside lanes and the adjacent sidewalk space) are evolving quickly across the Commonwealth of Massachusetts as municipalities of all sizes juggle the competing needs of pedestrians, cyclists, transit, transportation network companies (TNCs), in addition to conventional uses for parking, goods delivery, and emerg ...
  • BenchScale Electrochemical Treatment of CoContaminated Clayey Soil
    Bench-Scale Electrochemical Treatment of Co-Contaminated Clayey Soil
    Pelletier, Austin ;
    Hohner, Amanda K.
    2021-06-01 | PDF
    Industrial soil contamination is frequently unearthed by transportation agencies during construction within the right-of-way. As a result, transportation agencies may experience construction delays. Soils co-contaminated with high-molecular-weight polycyclic aromatic hydrocarbons (HMW-PAHs) and metals are commonly encountered in Illinois and exhibi ...
  • Freeway Segment Safety Performance Function SPF Development
    Freeway Segment Safety Performance Function (SPF) Development
    Himes, Scott ;
    Schenk, Kendra
    2021-06-01 | PDF
    This report documents the Ohio Department of Transportation’s effort to improve the reliability of safety decision-making through the development of planning-level and project design-level safety performance functions (SPFs). Planning-level SPFs will replace calibrated versions of national SPFs in Safety Analyst to support network screening. Projec ...
  • Investigation of Workflow Processes and Best Practices in Kentuckys CDL Program
    Investigation of Workflow Processes and Best Practices in Kentucky’s CDL Program
    Keathley-Helil, Valerie ;
    Martin, Andrew
    2021-06-01 | PDF
    Kentucky’s Division of Driver Licensing maintains the driver history records for all licensed drivers in Kentucky. It serves as the state driver licensing agency and is the locus for meeting the federal CDL requirements under 49 CFR 384. Kentucky relies on FMCSA’s Commercial Driver’s License Program Implementation (CDLPI) grant funding to subsidize ...
  • Determining Pavement Design Criteria for Recycled Aggregate Base and Large Stone Subbase
    Determining Pavement Design Criteria for Recycled Aggregate Base and Large Stone Subbase
    Cetin, Bora ;
    Coban, Haluk Sinan
    2021-06-01 | PDF
    This project was performed to evaluate the performance of recycled aggregates and large stones used in the aggregate base/subbase layers of pavement systems and provide recommendations regarding pavement design and material selection. As part of this project, eleven test cells were built at MnROAD to evaluate the impact of recycled aggregates and l ...
    Supporting Files
  • RheologyChemical Based Procedure To Evaluate AdditivesModifiers Used in Asphalt Binders for Performance Enhancements Phase 2
    Rheology-Chemical Based Procedure To Evaluate Additives/Modifiers Used in Asphalt Binders for Performance Enhancements: Phase 2
    Singhvi, Punit ;
    Mainieri, Javier Jesus Garcia
    2021-06-01 | PDF
    The increased use of softer binders in Illinois over the past decade is primarily attributed to the increased use of recycled materials in asphalt pavement construction. The shift in demand of using PG 58-28 over PG 64-22 has resulted in potential alternative methods to produce softer binders more economically using proprietary products. However, t ...
  • VISSIM Simulation Guidance
    VISSIM Simulation Guidance
    Hunter, Michael
    ORCID ICON IMG
    2021-06-01 | PDF
    Where analytical tools such as the Highway Capacity Software™ (HCS), SYNCHRO®, etc. do not adequately represent traffic operations within a study area, or do not provide the necessary performance metric(s) required for the analysis, detailed simulation or similar approaches may be required. In such cases, the Georgia Department of Transportation (G ...
  • Platooning for Improved Safety and Efficiency of SemiTrucks PISES II
    Platooning for Improved Safety and Efficiency of Semi-Trucks (PISES) II
    Viswanathan, Venkat ;
    Shankar, Varun
    2021-06-01 | PDF
    Advances in both scientific computing and machine learning (ML) have led to techniques to improve, replace, or speed up methods to solve problems in the physical sciences. For many nonlinear systems, traditional methods of calculation often carry a heavy computational burden due to complex dynamics, physical constraints, or multi-scale behavior. Th ...
  • Fatigue Life Estimation of Bridges With Smart Mobile Sensing
    Fatigue Life Estimation of Bridges With Smart Mobile Sensing
    Pakzad, Shamim N ;
    Takac, Martin
    2021-06-01 | PDF
    Bridge structures experience significant vibrations and repeated stress variations during their lifecycle. These conditions are the bases for fatigue analysis to identify fatigue cracking, which can be used to accurately establish the remaining fatigue life of the structures (i.e., the number of stress cycles before fatigue failure). This is typica ...
  • Review and Summary of PreWet Methods and Procedures
    Review and Summary of Pre-Wet Methods and Procedures
    Shi, Xianming ;
    Bergner, Dave
    2021-06-01 | PDF
    Pre-wetting is an important tool in the toolbox of winter road maintenance (WRM) operations. This research project collected all available and recent information regarding pre-wetting practices through a comprehensive literature review, an online survey of WRM practitioners, interviews and case studies of nine selected agencies, and outreach to six ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY2020 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY2020 Activities
    Finley, Melisa D. ;
    Pike, Adam M.
    2021-06-01 | PDF
    This project provides the Texas Department of Transportation with a mechanism to conduct high-priority, limited-scope evaluations of traffic control devices. Work conducted and concluded during the 2020 fiscal year included: (1) review of retroreflective raised pavement marker practices; (2) review of optical speed bar practices in horizontal curve ...
  • Economic and Environmental Benefits of a Reduced Roadside Mowing Program for Kentucky Highways
    Economic and Environmental Benefits of a Reduced Roadside Mowing Program for Kentucky Highways
    Van Dyke, Chris ;
    Wallace, Candice
    2021-06-01 | PDF
    A growing number of state departments of transportation (DOTs) are introducing conservation mowing programs that aim to reduce the frequency of roadside mowing while expanding the footprint of pollinator habitat. Wanting to get a better handle on the utility conservation mowing, the Kentucky Transportation Cabinet (KYTC) funded this study to explor ...
  • Where Ridehail Drivers Go Between Trips Trading off Congestion and Curb Availability
    Where Ridehail Drivers Go Between Trips: Trading off Congestion and Curb Availability?
    Millard-Ball, Adam ;
    Liu, Liwei
    2021-06-01 | PDF
    The authors analyze what ridehail drivers do when out of service between paid trips. The authors use a dataset of 5.3 million trips in San Francisco and partition each out of service trip into cruising, repositioning, and parking segments. The authors find that repositioning accounts for nearly two-thirds (63%) of the time between trips, with cruis ...
  • Public Engagement Practices During the COVID19 Pandemic and Other Disruptive Events
    Public Engagement Practices During the COVID-19 Pandemic and Other Disruptive Events
    Kline, Christine F.
    2021-06-01 | PDF
    MnDOT’s commitment to offer opportunities for meaningful input and to advance equity in transportation. Disruptive events such as the COVID-19 pandemic that limit or cut off in-person engagement present challenges to MnDOT’s efforts to continue its commitment to public engagement. The COVID-19 pandemic prompted MnDOT to explore new ways to engage w ...
  • Assessment of Structural Steel Coating Applications
    Assessment of Structural Steel Coating Applications
    Zhang, Lu ;
    Lv, Xuan
    2021-06-01 | PDF
    Research shows that even with the continuous development of coating technology, coating systems are still susceptible to deterioration and thus unable to provide protection for the long-term designed bridge service life. Recent advancement on data analytics offers an opportunity to leverage the wealth of historical data processed by State Departmen ...
  • Magnetic Flux Leakage MFL Method for Damage Detection in Internal PostTensioning Tendons
    Magnetic Flux Leakage (MFL) Method for Damage Detection in Internal Post-Tensioning Tendons
    Javed, Ali ;
    Sadeghnejad, Amir
    2021-06-01 | PDF
    The magnetic flux leakage (MFL) method has been identified as a promising non-destructive testing technique for detecting metal loss in external post-tensioned tendons and stay-cables. However, for internal tendons, the interfering signals from secondary ferromagnetic materials, such as mild reinforcement, can generate complicated signals and may l ...
  • Simplifying CastInPlace Joint Design Using ABC Pocket Connection Details in High Seismic Regions
    Simplifying Cast-In-Place Joint Design Using ABC Pocket Connection Details in High Seismic Regions
    Schwartz, Taylor ;
    Saiid Saiidi, M
    2021-06-01 | PDF
    Accelerated bridge construction (ABC) utilizes precast members to minimize on-site construction time, making it an appealing alternative to conventional cast-in-place (CIP) construction. The connections between these precast members are crucial as they must maintain structural integrity, and in regions of moderate and high seismic activity, ensure ...
  • Do MultiUsePath Accessibility and Clustering Effect Play a Role in Residents Choice of Walking and Cycling
    Do Multi-Use-Path Accessibility and Clustering Effect Play a Role in Residents' Choice of Walking and Cycling?
    Wang, Chih-Hao ;
    Chen, Na
    2021-06-01 | PDF
    The transportation studies literature recognizes the relationship between accessibility and active travel. However, there is limited research on the specific impact of walking and cycling accessibility to multi-use paths on active travel behavior. Combined with the culture of automobile dependency in the US, this knowledge gap has been making it di ...
  • Developing Effective Traffic Management Strategies for Special Events based on ADMS Dataset Findings and Recommendations for LA METRO
    Developing Effective Traffic Management Strategies for Special Events based on ADMS Dataset: Findings and Recommendations for LA METRO
    METRANS Transportation Center (Calif.)  ...
    2021-06-01 | PDF
    Major events are a significant source of traffic congestion, especially in large metropolitan areas. We conduct a case study of football games played at the Los Angeles Memorial Coliseum; a venue located near downtown Los Angeles with a capacity of about 80,000. Two teams play home games at the Coliseum, the Los Angeles Rams, and the University of ...
  • Inventory and Statistical Characterization of Inorganic Soil Constituents in Illinois
    Inventory and Statistical Characterization of Inorganic Soil Constituents in Illinois
    Anderson, Andrew ;
    Yacucci, Mark
    2021-06-01 | PDF
    This report presents a statistical analysis of the Regulated Substances Library (RSL) developed by the Illinois Department of Transportation. The RSL is comprised of surficial soil chemistry data obtained from rights-of-way subsurface soil sampling conducted for routine preliminary site investigations. The 3.7-million-record RSL database is compare ...
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