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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 4741 - 4760 of 36908 results
  • 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. ...
  • Optimizing Transit Equity and Accessibility by Integrating Relevant GTFS Data Performance Metrics
    Optimizing Transit Equity and Accessibility by Integrating Relevant GTFS Data Performance Metrics
    Fan, Wei (David) ;
    Li, Yang
    2020-09-01 | PDF
    This research develops and recommends practical optimization models for improving transit equity and accessibility for people by integrating performance metrics with using General Transit Feed Specification (GTFS) data. In such sense, two optimization models under two different conditions (with limited budget and without limited budget) for improvi ...
  • COVID19 Impacts on Cities and Suburbs Key Takeaways across Multiple Sectors
    COVID-19 – Impacts on Cities and Suburbs: Key Takeaways across Multiple Sectors
    Kaplowitz, Grace ;
    Larco, Nico
    2020-09-01 | PDF
    In this paper, the authors explore the landscape of COVID-19 disruptions to date on land use and real estate, urban design, building design, transportation, e-commerce and retail, and goods delivery. The authors also highlight the longer-term questions and potential ongoing impacts COVID-19 might have on the built environment. Key findings include: ...
  • Evaluating PermittedProtected Versus Protected Left Turn Signals in Louisiana Research Project Capsule 213SS
    Evaluating Permitted/Protected Versus Protected Left Turn Signals in Louisiana: Research Project Capsule [21–3SS]
    Codjoe, Julius
    2020-09-01 | PDF
    The primary objective of this project is to study the safety and operation of existing signal intersections (protected only versus permitted/protected left turns versus permitted only but with left turn lanes) along with their geometric features, as described in the DOTD Traffic Signal Manual, with the view to develop guidance on when it is appropr ...
  • Testing Wildlife Friendly Fence Modifications to Manage Wildlife and Livestock Movements
    Testing ‘Wildlife Friendly’ Fence Modifications to Manage Wildlife and Livestock Movements
    Landguth, Erin ;
    Jakes, Andrew
    2020-09-01 | PDF
    Fences are ubiquitous across the landscape, yet there is little understanding on their effects on wildlife. Fences pose both indirect (i.e., access to habitat, energetic costs) and direct (i.e., mortality) consequences to wildlife, and so their effects are an important consideration. Wildlife managers, land managers, and Departments’ of Transportat ...
  • Predicting Travel Time on Freeway Corridors Machine Learning Approach
    Predicting Travel Time on Freeway Corridors: Machine Learning Approach
    Fan, Wei (David) ;
    Chen, Zheng
    2020-09-01 | PDF
    The purpose of this project is to develop a systematic approach to predicting freeway travel time. An advanced machine learning-based approach (i.e. XGBoost model) is employed to predict freeway travel time. The prediction methodology can assist the decision makers in planning, designing, operating, and managing a more efficient highway system. Spe ...
  • Full Depth Pavement Reclamation Performance Assessment and Recommendations for Best Performance
    Full Depth Pavement Reclamation: Performance Assessment and Recommendations for Best Performance
    Kwon, Jayhyun ;
    Seo, Youngguk
    2020-09-01 | PDF
    This study investigates variability in the FDR base layer from the results of field and laboratory data of a reconstruction project. The results of the UCS tests show 7-day strengths are more stable with less variability across the sites than those of 3 days. Deflection data analysis results also show that the FDR layer provides more uniform stiffn ...
  • Application of an Equity Rubric That Shows Need for Rural and Low Density Communities Near Megaregions Case Study IH 10 East Corridor Houston to Texas State Line
    Application of an Equity Rubric That Shows Need for Rural and Low Density Communities Near Megaregions: Case Study IH 10 East Corridor, Houston to Texas State Line
    Lewis, Carol Abel ;
    Goodwin, Gwendolyn
    2020-09-01 | PDF
    Rural and low density residents proximate to Megaregion anchor cities could be advantaged by improved public transportation into nearby large urban areas. This is particularly the case for residents challenged by inequities due to ethnicity, language and income. Before planning can begin for any transportation project or service, a need must be est ...
  • Quantifying the Impact of Cover Deficiencies on Bridge Deck Service Life Recommendations for Contracting
    Quantifying the Impact of Cover Deficiencies on Bridge Deck Service Life: Recommendations for Contracting
    Stewart, Lauren K ;
    Kurtis, Kimberly E
    2020-09-01 | PDF
    Construction of reinforced concrete bridge decks with shallower or deeper-than-specified concrete cover remains an ongoing challenge for the Georgia Department of Transportation (GDOT) because it has the potential to lead to reductions in service life. This reduction in service life can result in negative consequences on traffic (and create an asso ...
  • Assessment of DOTDs Friction Aggregate Sources Through Laboratory and Accelerated Testing Research Project Capsule 204P
    Assessment of DOTD’s Friction Aggregate Sources Through Laboratory and Accelerated Testing: Research Project Capsule [20–4P]
    Wu, Zhong
    2020-09-01 | PDF
    The research objectives are to assess the PSV test variation by testing diff erent aggregate sources, shipment times, and test operators; propose a new aggregate friction testing procedure for DOTD, which can be used for initial source approval as well as for predicting field friction performance of wearing course aggregates; determine threshold fr ...
  • Feasibility Study of 3D Printing of Concrete for Transportation Infrastructure Tech Transfer Summary
    Feasibility Study of 3D Printing of Concrete for Transportation Infrastructure [Tech Transfer Summary]
    Wang, Kejin
    ORCID ICON IMG
    2020-09-01 | PDF
    The goal of the project was to apply three-dimensional (3D) concrete printing technology to transportation-related infrastructure. The specific objectives were as follows: • Develop a printable and functional 3D printing concrete mixture using materials commonly available in Iowa • Characterize the 3D printed concrete properties and better understa ...
  • Dynamic Speed Harmonization in Connected Urban Street Networks Improving Mobility
    Dynamic Speed Harmonization in Connected Urban Street Networks: Improving Mobility
    Hajbabaie, Ali ;
    Tajalli, Mehrdad
    2020-09-01 | PDF
    The goal of this project is to improve mobility in urban street networks by developing a methodology for dynamic speed harmonization suitable for connected urban street networks. The methodology aims at finding optimal advisory speeds on each transportation link that will be transferred to connected and autonomous vehicles, with the objective of re ...
  • Performance of HighStrength Steel Reinforcement in Shear Friction Applications
    Performance of High-Strength Steel Reinforcement in Shear Friction Applications
    Barbosa, Andre ;
    Trejo, David
    2020-09-01 | PDF
    The use of high strength steel reinforcement has the potential to provide economic and constructability benefits when used in reinforced concrete structures. Current design provisions limit the nominal yield strength of reinforcing steel bars to 60 ksi (420 MPa) for many bridge design applications. This report presents results from a laboratory tes ...
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