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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 4301 - 4320 of 36019 results
  • Comparison of Standard Penetration Test SPT Nvalue with Alternative Field Test Methods in Determining Moduli for Settlement Predictions
    Comparison of Standard Penetration Test (SPT) N-value with Alternative Field Test Methods in Determining Moduli for Settlement Predictions
    Chopra, Manoj ;
    Arboleda-Monsalve, Luis G.
    2020-09-01 | PDF
    In the determination of immediate settlements, the stiffness of the soil is a critical parameter. The selected value of the modulus of elasticity is typically obtained from published correlations using blow counts from standard penetration tests and tip or skin friction resistances from cone penetration tests. Other methods include the use of dilat ...
  • Data Management and Analytics for UF Smart Testbed
    Data Management and Analytics for UF Smart Testbed
    Banerjee, Tania ;
    Mahajan, Dhruv
    2020-09-01 | PDF
    We describe the data collection, management mechanisms, and analysis mechanisms for data collected from the ISTREET testbed, which comprises selected roads on the University of Florida campus and adjoining City of Gainesville roads. The test bed is instrumented with roadside units that deliver a variety of data about traffic. In this project, we pr ...
  • Is the Transit Industry Prepared for the Cyber Revolution? Policy Recommendations to Enhance Surface Transit Cyber Preparedness [supporting datasets]
    Belcher, Scott ;
    Belcher, Terri
    2020-09-01 | PDF
    The intent of this study is to assess the readiness, resourcing, and structure of public transit agencies to identify, protect from, detect, respond to, and recover from cybersecurity vulnerabilities and threats. Given the multitude of connected devices already in use by the transit industry and the vast amount of data generated (with more coming o ...
    Dataset Supporting Files
  • Development of IDOTs Proposed Smoothness Specification Based on the International Roughness Index
    Development of IDOT’s Proposed Smoothness Specification Based on the International Roughness Index
    Lee, Hyung S ;
    Vavrik, William
    2020-09-01 | PDF
    The existing smoothness specification implemented by the Illinois Department of Transportation (IDOT) was based on profile-index measurement, which was also widely used by other agencies. There is a national and international trend, however, toward using the international roughness index (IRI) as a standard smoothness index for pavement management ...
  • Effects of Tree Canopy on Pavement Condition Safety and Maintenance Phase 2
    Effects of Tree Canopy on Pavement Condition, Safety and Maintenance – Phase 2
    Naik, Bhaven ;
    Matlack, Glenn
    2020-09-01 | PDF
    Tree canopies are common alongside and above rural highways in Ohio. Consequently, ODOT wants to know how a tree canopy affects pavement condition and road safety. A review of published research conducted for Phase I of this study suggested that tree canopies extend the life of asphalt pavement and improve road safety. Road managers and highway off ...
  • Will Ride-Hailing Enhance Mobility for Older Adults? A California Survey [supporting dataset]
    Shirgaokar, Manish ;
    Agrawal, Asha Weinstein
    2020-09-01 | ZIP
    Ride-hailing services such as Lyft and Uber offer a potential mobility option for the growing numbers of aging Californians who risk social and economic isolation if they cannot drive for health or financial reasons. They could also serve older adults who currently have mobility options but would prefer a ride-hailing alternative for at least some ...
    Dataset Supporting Files
  • Special Legislation and Megaregion Transit Planning
    Special Legislation and Megaregion Transit Planning
    Gallun, Susanna ;
    Hunn, Alexander
    2020-09-01 | PDF
    Transportation law in many states has become highly inconsistent between jurisdictions, making cooperation more challenging. MRs present an opportunity to accommodate equity, congestion, and mobility issues by providing a connected multimodal environment where multiple modes can combine to respond with flexibility to changing needs. One way to impr ...
  • Balanced Asphalt Concrete MIX Performance in Utah Phase IV Cracking Indices for Asphalt Mixtures
    Balanced Asphalt Concrete MIX Performance in Utah, Phase IV: Cracking Indices for Asphalt Mixtures
    VanFrank, Kevin ;
    Romero, Pedro
    2020-09-01 | PDF
    The Utah Department of Transportation (UDOT) has been seeking a test to balance its asphalt mixes against the stiffness encouraged by the Hamburg Wheel Tracking test and the use of recycled asphalt pavement (RAP). Without this balance, the over-stiffening of mixes has led to premature cracking. Two configurations of cracking tests have been studied ...
  • Log Movement in the Superior Region Rate and Capacity Based Analysis of Modal Shares
    Log Movement in the Superior Region - Rate and Capacity Based Analysis of Modal Shares
    Lautala, Pasi ;
    Zhang, Kuilin
    2020-09-01 | PDF
    For the last two decades, the rail system in the Superior (Project) region (Upper Peninsula of Michigan and northern parts of Wisconsin and Minnesota) has witnessed declining freight volumes. This has specifically impacted forest products industry, one of the largest users of freight rail transportation in the region. Log movements by rail from agg ...
  • Historic Streetcar Systems of Colorado
    Historic Streetcar Systems of Colorado
    Litvak, Dianna ;
    Raath, Ethan
    2020-09-01 | PDF
    Transportation impacts to historic streetcar lines in Denver and other communities in Colorado are often unforeseen given that many tracks lay underneath paved streets and are not well documented. This results in frequent unanticipated discoveries during construction of publicly assisted transportation improvement projects in Colorado. A historic c ...
  • Colloidal Silica Cement Enhancing Admixture Product Evaluation
    Colloidal Silica: Cement Enhancing Admixture Product Evaluation
    Halsey, Lieska ;
    Hansen, David
    2020-09-01 | PDF
    This research investigated the potential to use colloidal silica as a cement enhancing admixture in NDOT’s concrete mix designs. Engineers had two objectives in this study: 1. Determine if CS can enhance high, early strength for use in patching and repairs. 2. Determine if CS can maintain or improve ASR mitigation as F-ash content is decreased.
  • Vision Zero Risk Analysis Model ODN RAM Model Documentation
    Vision Zero Risk Analysis Model: ODN RAM Model Documentation
    Nadeau, Carrie Anne
    2020-09-01 | PDF
    Open Data Nation (ODN) worked with Howard University, on behalf of the District Department of Transportation (DDOT), to construct a predictive model to anticipate which roads are most likely to have traffic crashes in Washington, DC. This work is in support of the city’s broader Vision Zero initiative and its deliverables are valuable tools for cit ...
  • Implementation of Arterial Bottleneck Characterization Methods in Virginia
    Implementation of Arterial Bottleneck Characterization Methods in Virginia
    Zhao, Mo ;
    Venkatanarayana, Ramkumar
    2020-09-01 | PDF
    In 2019, the Virginia Transportation Research Council (VTRC) published Improving the Identification and Characterization of Arterial Congestion Bottlenecks by Zhao and Venkatanarayana. The report described a study recommending that the Virginia Department of Transportation and the Office of Intermodal Planning and Investment pursue development of d ...
  • The 247 Sobriety Programs Effects on Impaired Drivers in North Dakota 20142019
    The 24/7 Sobriety Program’s Effects on Impaired Drivers in North Dakota: 2014–2019
    Vachal, Kimberly ;
    Zhou, Yun
    2020-09-01 | PDF
    The 24/7 Sobriety Program is an intervention strategy mandating that alcohol-impaired driving offenders remain sober as a condition of bond or pre-trial release. The goal is to monitor the most at-risk offenders in North Dakota and require that these individuals remain sober in order to keep roadways safe from hazardous drivers. As a component of t ...
  • Freight Megaregional Planning and Financial Policy
    Freight Megaregional Planning and Financial Policy
    Walton, C Michael ;
    Walthall, Rydell D.
    2020-09-01 | PDF
    Like the national fuel tax, state fuel taxes face problems of declining real revenue due to inflation and improvements in fuel efficiency. This report examines state fuel tax levels, how states have responded in the past decade to maintain transportation funding, and how the nature of freight transportation means alternatives to fuel taxes might be ...
  • Analysis of the Benefits of Green Streets
    Analysis of the Benefits of Green Streets
    Ferrell, Christopher E. ;
    Eells, John M
    2020-09-01 | PDF
    Green streets offer many potential benefits that include improving water quality, absorbing carbon (sequestration), and reducing urban heat island effects. This report summarizes: (1) the research team’s analysis of 14 tools calculating green streets benefits; and (2) the results of applying the most promising calculators to a select group of green ...
  • Feasibility and Advantages of Accepting Concrete Other Than 28 Days Research Project Capsule 203C
    Feasibility and Advantages of Accepting Concrete Other Than 28 Days: Research Project Capsule [20–3C]
    Saunders, William J
    2020-09-01 | PDF
    This study seeks to thoroughly document and evaluate the current state of knowledge and best practices for investigating acceptance criteria of concrete at times other than 28 days. The scope of the research will include an overview of both the private and public sector and consider important material properties and test methods of concrete as they ...
  • COVID19 Impacts on Cities and Suburbs Impacts to the Urbanism Next Framework
    COVID-19 Impacts on Cities and Suburbs: Impacts to the Urbanism Next Framework
    Kaplowitz, Grace ;
    Larco, Nico
    2020-09-01 | PDF
    This is the second paper in a series Urbanism. Next is releasing focused on the COVID-19 pandemic. The first paper summarizes our initial findings on the impacts of COVID-19 on the built environment, providing background for the COVID-19 disruptions identified in this paper.
  • Corridor Level Adaptive Signal Control Continuation
    Corridor Level Adaptive Signal Control Continuation
    Liu, Hao ;
    Machemehl, Randy
    2020-09-01 | PDF
    This study (1) develops a stochastic traffic delay model based on busy period analysis in queueing theory; (2) proposes a traffic optimization model based on the stochastic traffic delay model; (3) proposes a rolling horizon scheme to update signal timing on a phase-phase base; and (4) demonstrates the efficiency of the proposed model through case ...
  • Measuring Success for Safe Routes to School Programs
    Measuring Success for Safe Routes to School Programs
    Voulgaris, Carole Turley ;
    Alexander, Serena
    2020-09-01 | PDF
    Safe Routes to School (SRTS) programs aim to increase the share of students who commute to school by active modes (e.g., walking and cycling). The goal of this work was to assess the effectiveness of SRTS programs. Towards that end, we analyzed the California Household Travel Survey (CHTS) data from the four counties in the San Francisco Bay area. ...
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