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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 3721 - 3740 of 36011 results
  • Research on Traffic Sign Retroreflective Sheeting Performance A Synthesis of Practice
    Research on Traffic Sign Retroreflective Sheeting Performance: A Synthesis of Practice
    Hawkins Jr, H Gene
    2021-04-01 | PDF
    Sign retroreflectivity is an important characteristic of traffic signs, and it is a critical factor in defining the effectiveness of signs in a nighttime environment. This synthesis summarizes previous research on various aspects of sign sheeting retroreflectivity in nine areas: basic retroreflectivity science; retroreflectivity materials, specific ...
  • Raised Pavement Marker RPM Assessment Using Highway Speed Mobile Retroreflectivity Technology
    Raised Pavement Marker (RPM) Assessment Using Highway Speed Mobile Retroreflectivity Technology
    Oracheff, Alexander ;
    Shahin, Ali
    2021-04-01 | PDF
    The focus of this study was to configure a Laserlux G7 mobile retroreflectivity unit (MRU) to accurately and repeatably detect and measure the retroreflectivity of in-service raised pavement markers (RPMs). At this time, the Florida Department of Transportation (FDOT) assesses the quality of in-service RPMs as part of a visual inspection. Currently ...
  • Work Zone Alert Systems
    Work Zone Alert Systems
    Mishra, Sabyasachee ;
    Golias, Mihalis M.
    2021-04-01 | PDF
    Work Zone Intrusion Alert (WZIA) technologies are emerging technologies that use sensors and alarms to detect and alert highway workers of vehicles intruding into a work zone perimeter. WZIA technologies are still evolving and there is no existing set of best practices for DOTs interested in implementing them. This project aimed to identify and eva ...
  • Domestic Airline Fares Consumer Report Fourth Quarter 2020 Passenger and Fare Information COVID 19 Impact Adjustments
    Domestic Airline Fares Consumer Report: Fourth Quarter 2020 Passenger and Fare Information [COVID -19 Impact Adjustments]
    United States. Department of Transportation
    2021-04-01 | Domestic Airline Fares Consumer Report | PDF
    The COVID-19 global health emergency began reducing air traffic volumes in the first quarter of 2020. The emergency’s full impact on traffic levels and fares is reflected beginning in the second quarter 2020 report and will be reflected in subsequent Domestic Airline Fares Consumer Reports. For example, as a result of the COVID-19 global health eme ...
  • Numerical Investigations of Virus Transport Aboard a Commuter Bus
    Numerical Investigations of Virus Transport Aboard a Commuter Bus
    Rahai, Hamid R. ;
    Bonifacio, Jeremy
    2021-04-01 | PDF
    The authors performed unsteady numerical simulations of virus/particle transport released from a hypothetical passenger aboard a commuter bus. The bus model was sized according to a typical city bus used to transport passengers within the city of Long Beach in California. The simulations were performed for the bus in transit and when the bus was at ...
  • The Texas Department of Transportation TxDOT Alternative Delivery System ADS DecisionSupport Tool V20
    The Texas Department of Transportation (TxDOT) Alternative Delivery System (ADS) Decision-Support Tool V2.0
    Demetracopoulou, Vassiliki ;
    O'Brien, William J.
    2021-04-01 | PDF
    The Texas Department of Transportation (TxDOT) sought to update their project delivery method (PDM) selection methodology after gaining experience with the design-build method and updating their programmatic documents. This research study was performed by the Center for Transportation Research and The University of Texas at Austin through an intera ...
  • Business Location Data Analysis and Editing Interface Tool Development
    Business Location Data Analysis and Editing Interface Tool Development
    Kamga, Camille ;
    Wu, David Ng
    2021-04-01 | PDF
    One of the most important aspects of transportation planning is understanding employment information of businesses and organizations. Information such as location of employment, size of organization or business in terms of employees, sales, can provide valuable input to understanding travel patterns and human activities. Visualizing this informatio ...
  • Implementation of a Protocol for Acceptance of New OverCoating Systems for Steel Surfaces Technical Brief
    Implementation of a Protocol for Acceptance of New Over-Coating Systems for Steel Surfaces [Technical Brief]
    Balaguru, Perumalsamy
    2021-04-01 | PDF
    This project was undertaken to develop a procedure to accept new coating systems for over-coating of steel surfaces and the results are presented in three parts. Section I and Section II covers acceptance procedure and details of information needed based on accelerated corrosion test. Section III presents a model for predicting field service life u ...
  • MultiBusiness Commute Optimization System System Development and Pilot Case Study
    Multi-Business Commute Optimization System: System Development and Pilot Case Study
    Abdallah, Moatassem ;
    Clevenger, Caroline M.
    2021-04-01 | PDF
    This report focuses on the development of an innovative Multi-Business Commute Optimization System (MBCOS) to contribute to reducing negative environmental impacts of the transportation sector. MBCOS consists of three integrated components, a website (www.commuteopt.com), a travel attributes model, and a multi-objective optimization model. The webs ...
  • Transportation Equity Needs Assessment Toolkit
    Transportation Equity Needs Assessment Toolkit
    Williams, Kristine ;
    Boyd, Tia
    2021-04-01 | PDF
    This project would complement the Transportation Equity Scorecard ─ a tool for project screening and prioritization ─ that is currently being developed by the project team with funding from CTEDD. For this RFP, we propose developing a needs assessment audit tool and supporting guidance to demonstrate how the equity criteria and methods in the Score ...
  • Review of TRAC Program Local Investment Factors
    Review of TRAC Program Local Investment Factors
    Sperry, Benjamin R. ;
    Lozier, William C
    2021-04-01 | PDF
    The Transportation Review Advisory Council (TRAC) program is the mechanism through which the Ohio Department of Transportation (ODOT) provides funding for Major New Capacity and other critical infrastructure projects within the state. As part of the evaluation process for TRAC funding consideration, the value of local infrastructure (roadways, util ...
  • PostFire Damage Inspection of Concrete Structures Final Report
    Post-Fire Damage Inspection of Concrete Structures: Final Report
    Gerasimidis, Simos ;
    Civjan, Scott
    2021-04-01 | PDF
    Although concrete tunnel structures can lose strength and long-term durability due to fire, literature on the remaining capacity of structures after fire events is scattered, and few published post-fire inspection protocols exist, especially for tunnel structures. This project investigates the deleterious effects of fire on concrete tunnel structur ...
  • Work Zone Capacity Estimation for High Truck Volume Routes in Arkansas Predicting Highway Capacity through Work Zones with High Truck Volumes and Reduced Lane Geometry Based Upon Local Conditions
    Work Zone Capacity Estimation for High Truck Volume Routes in Arkansas: Predicting Highway Capacity through Work Zones with High Truck Volumes and Reduced Lane Geometry Based Upon Local Conditions
    Romano, Kimberly K ;
    McKenney, Christopher T
    2021-04-01 | PDF
    Work zones on freeways are estimated to contribute to nearly 24 percent of non‐recurring delay. Prior to 2010, the Highway Capacity Manual (HCM) provided limited guidance on vehicular capacity impacts for freeway work zones. Simplified methodologies estimated capacities for short and long term freeway work zones. Previous research (MBTC 2025) condu ...
  • Tools and Strategies for Developing Winter Weather Indexes Research Brief
    Tools and Strategies for Developing Winter Weather Indexes [Research Brief]
    Rosenow, Ken
    2021-04-01 | PDF
    Researchers developed a step-by-step guide and a flowchart tool to help agencies identify or develop severity index methods that fit their needs and their available data sources.
  • An Intersectoral Approach To Study Built Environment Factors Affecting Postpartum Depression and Childrens Health
    An Intersectoral Approach To Study Built Environment Factors Affecting Postpartum Depression and Children’s Health
    Zhang, Yiye ;
    Hermann, Alison
    2021-03-31 | PDF
    This study examined the association of the quality of built environment in the neighborhood and maternal mental health. In Aim 1 of its 3 aims, we developed predictive models to predict and subtype postpartum depression (PPD) using clinical and built environment information. The predictive model was constructed using a combination of machine learni ...
  • Spatial Sustainability Assessment of Green Stormwater Infrastructure for Surface Transportation Planning Phase III
    Spatial Sustainability Assessment of Green Stormwater Infrastructure for Surface Transportation Planning, Phase III
    Zhang, Qiong ;
    Xu, Xiaofan
    2021-03-31 | PDF
    Transportation authorities are responsible for managing the stormwater runoff that carries pollutants from the transportation-adjacent land and vehicles. The proper stormwater management approach like green infrastructure can help control flooding and the runoff pollutants that may impair water environment and threaten the ecosystem and human healt ...
  • Ebikes Effect on Mode and Route Choice A Case Study of Richmond VA Bike Share
    E-bikes’ Effect on Mode and Route Choice: A Case Study of Richmond, VA Bike Share
    Chavis, Celeste ;
    Martinez, Vanessa Frias
    2021-03-31 | PDF
    The bicycle has become a legitimate transportation option in many cities due to its different benefits. Lower transportation costs, health improvement, and lower emission rates are some critical benefits of a bicycle ride. A large body of research exists on bicycle route choice and travel behavior. There is currently a lack of research on mode shif ...
  • Understand Usage Patterns of EScooter Sharing and Policy Implications
    Understand Usage Patterns of E-Scooter Sharing and Policy Implications
    Zhang, Yu ;
    Guo, Yujie
    2021-03-31 | PDF
    Shared e-scooter is a fairly new transportation mode that emerged in late 2017. Since then, it has gained popularity around the world; however, it also has spiraled into disarray in many cities due to the lack of e scooter regulations and improper parking and riding behaviors. Limited understanding of shared e-scooters restrains policymakers from d ...
  • Towards Integrating Resilience into Everyday Transportation Practices of Coastal and River Valley Communities
    Towards Integrating Resilience into Everyday Transportation Practices of Coastal and River Valley Communities
    Herrera, Nelida ;
    Wolshon, Brian
    2021-03-31 | PDF
    Coastal and river valley communities have become increasingly vulnerable to sea level rise and other disasters which can disrupt transportation systems. Therefore, it is important for these systems to be resilient. Analyzing the resilience of transportation systems is important for practitioners and decision makers to identify weaknesses within the ...
  • Development of Comprehensive Inspection Protocols for Deteriorated Steel Beam Ends
    Development of Comprehensive Inspection Protocols for Deteriorated Steel Beam Ends
    Tzortzinis, Georgios ;
    Pryor, Gabrielle
    2021-03-31 | PDF
    Recent research has developed new improved procedures that accurately describe the remaining loadcarrying capacity of these deteriorated members. These new procedures are based on computational simulations and experimental testing of real deteriorated beams. The outcome of a recently completed research project (“Development of Load Rating Procedure ...
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