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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 4321 - 4340 of 36019 results
  • 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 ...
  • Supporting Bridge Management With Advanced Analysis and Machine Learning
    Supporting Bridge Management With Advanced Analysis and Machine Learning
    Steelman, Joshua ;
    Garcia, Francisco
    2020-09-01 | PDF
    A supplemental Artificial Neural Network (ANN)-based tool was developed to support the Nebraska Department of Transportation (NDOT) in optimizing bridge management investments when choosing between refined modeling, field testing, retrofitting, or bridge replacement. Load ratings typically increase by approximately 15% to 20% when using detailed fi ...
  • Utilizing School Bus Routes to Deliver Meals to Families in Need
    Utilizing School Bus Routes to Deliver Meals to Families in Need
    Smith, Stephen F. ;
    Lightman, Karen
    2020-09-01 | PDF
    This report summarizes the results of a 3-month project aimed at coupling artificial intelligence (AI)-based routing and scheduling technology with machine learning to demonstrate an initial solution to the problem of remote delivery of school meals to students in need, and jumpstarting research in this area. With the onset of the COVID-19 pandemic ...
  • Development and Calibration of a LaserBased Highway Deflection Measuring System
    Development and Calibration of a Laser-Based Highway Deflection Measuring System
    Hernandez, Joaquin B. ;
    Vishnoi, Suyash
    2020-09-01 | PDF
    Despite recent developments, the measurement of actual pavement surface deflections under the axles of a moving truck at a network level remains a challenge in pavement engineering. Several pieces of equipment have been developed in the past decade but they fail to accurately measure actual deflection. Most of them measure indicators of deflection ...
  • Trajectory Optimization of Connected and Autonomous Vehicles CAVs at Signalized Intersections
    Trajectory Optimization of Connected and Autonomous Vehicles (CAVs) at Signalized Intersections
    Fan, Wei (David) ;
    Liu, Pengfei
    2020-09-01 | PDF
    This research will develop guidelines and recommendations for estimating and predicting intersection efficiency in the presence of connected and autonomous vehicles (CAVs) and therefore will lead to a better understanding of how CAVs will improve mobility at signalized intersections. To better understand the impact of CAVs on the operation of signa ...
  • Characteristics of Effective Metropolitan Areawide Public Transit A Comparison of European Canadian and Australian Case Studies
    Characteristics of Effective Metropolitan Areawide Public Transit: A Comparison of European, Canadian, and Australian Case Studies
    DeRobertis, Michelle ;
    Ferrell, Christopher E.
    2020-09-01 | PDF
    This research project investigates the replicable characteristics, policies, and practices of successful metropolitan areawide public transportation networks that contribute to high usage and make transit an effective competitor to the private motor vehicle. The research method involves the qualitative and quantitative analysis of ten international ...
  • Impacts of Bicycling Corridor Improvements on Users Behaviors in Large Cities
    Impacts of Bicycling Corridor Improvements on Users’ Behaviors in Large Cities
    Azimi, Mehdi ;
    Rahman, Mohammed Suyedur Luqman
    2020-09-01 | PDF
    Research has shown that increasing opportunities for bicycle transportation can reduce overall Vehicle Miles Traveled (VMT) and auto trips, promote economic development, and improve environmental quality and public health and physical activity. Furthermore, bike lanes and corridors improve the transportation mobility by reducing interaction between ...
  • Evaluation of LongTerm Strength and Durability Properties of PreStressed Concrete Girders With Microcracking
    Evaluation of Long-Term Strength and Durability Properties of Pre-Stressed Concrete Girders With Microcracking
    Ferron, Raissa ;
    Salvatore, S
    2020-09-01 | PDF
    The presence of unexplained surface microcracks in several in-service prestressed girders across Texas led to concerns of reduced service life due to loss in long-term strength and durability. This project was designed to estimate both this potential loss in service life and the likelihood of long-term strength and durability issues that might aris ...
  • Rural Transit Fact Book 2020
    Rural Transit Fact Book 2020
    Mattson, Jeremy ;
    Mistry, Dilip
    2020-09-01 | PDF
    Public transportation plays a fundamental role in the livability of communities of all sizes. The Rural Transit Fact Book provides information on transit service availability and cost to help the transit industry in the United States provide efficient and effective service to meet rural community mobility needs. Financial and operating statistics c ...
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