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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 4141 - 4160 of 36908 results
  • The Impact of Ride Hail Services on the Accessibility of Nonprofit Services
    The Impact of Ride Hail Services on the Accessibility of Nonprofit Services
    Mason, Dyana P ;
    Menard, Miranda
    2021-04-01 | PDF
    Nonprofit organizations are responsible for providing a significant level of human services across the United States, often in collaboration with government agencies. In this work, they address some of the most pressing social issues in society – including homelessness, poverty, health care and education. While many of these organizations consider ...
  • Streetlevel Flooding Platform Sensing and Data Sharing for Urban Accessibility and Resilience
    Street-level Flooding Platform: Sensing and Data Sharing for Urban Accessibility and Resilience
    Henaff, Elizabeth ;
    Mydlarz, Charlie
    2021-04-01 | PDF
    Access to real-time information on flooding can improve resiliency and efficiency by allowing residents to identify navigable transportation routes and make informed decisions to avoid exposure to floodwater contaminants. However, very little data exist on the frequency and extent of urban surface flooding, and there is an unmet need for hyperlocal ...
  • Comparison of Wet Reflective Elements With Tape A Pavement Marking Study Based on Field Measurements
    Comparison of Wet Reflective Elements With Tape – A Pavement Marking Study Based on Field Measurements
    Medina, Juan C.
    2021-04-01 | PDF
    This field-based evaluation summarizes the performance, in terms of retroreflectivity, of a number of treatments for pavement markings applied to continuous yellow and white edge lines, as well as broken white lane lines. Measurements were taken using mobile and semi-mobile setups for dry conditions and wet conditions, respectively, along a test de ...
  • A Study of the Impact of Ridehailing on Public Transit Ridership
    A Study of the Impact of Ride-hailing on Public Transit Ridership
    Breuer, Helena ;
    Du, Jianhe
    2021-04-01 | PDF
    Existing literature on the relationship between ridehailing (RH) and transit services is limited to empirical studies that rely on self-reported answers and lack spatial and temporal contexts. To fill this gap, this research takes a novel approach that uses real-time geospatial analyses. Using this approach, the authors estimate the extent to which ...
  • Comparing Pricing Mechanisms for Managed Lanes
    Comparing Pricing Mechanisms for Managed Lanes
    Burris, Mark ;
    Jha, Kartikeya
    2021-04-01 | PDF
    Two common means of pricing managed lanes (MLs) are to vary tolls based on time of day or to vary them dynamically based on real-time congestion. It is not clear which of the two tolling options is more effective in regulating ML usage. In this study, large datasets on toll prices, vehicle travel speeds, and traffic volumes were used to assess the ...
  • City Best Practices To Improve Transit Operations and Safety
    City Best Practices To Improve Transit Operations and Safety
    DeRobertis, Michelle ;
    Ferrell, Christopher E.
    2021-04-01 | PDF
    Public, fixed-route transit services most commonly operate on public streets. In addition, transit passengers must use sidewalks to access transit stops and stations. However, streets and sidewalks are under the jurisdiction of municipalities, not transit agencies. Various municipal policies, practices, and decisions affect transit operations, ride ...
  • Secondary Particulate Matter Exceed Primary Emissions from Current Gasoline Vehicles Air Quality and Public Health Implications
    Secondary Particulate Matter Exceed Primary Emissions from Current Gasoline Vehicles: Air Quality and Public Health Implications
    Karavalakis, Georgios
    2021-04-01 | PDF
    A comprehensive study on the effects of photochemical aging on exhaust emissions from a vehicle equipped with a gasoline direct injection engine when operated over seven different driving cycles was assessed using an oxidation flow reactor. Both primary emissions and secondary aerosol production were measured over the Federal Test Procedure, LA92, ...
  • Comparing Twitter and Lodes Data for Detecting Commuter Mobility Patterns
    Comparing Twitter and Lodes Data for Detecting Commuter Mobility Patterns
    Albrecht, Jochen ;
    Petutschnig, Andreas
    2021-04-01 | PDF
    Local and regional planners struggle to keep up with rapid changes in mobility patterns. This exploratory research is framed with the overarching goal of asking if and how geo-social network data (GSND), in this case, Twitter data, can be used to understand and explain commuting and non-commuting travel patterns. The research project set out to det ...
  • Using Big Data To Estimate the Environmental Benefits of Congestion Pricing in the Los Angeles Metropolitan Area
    Using Big Data To Estimate the Environmental Benefits of Congestion Pricing in the Los Angeles Metropolitan Area
    Bento, Antonio M.
    ORCID ICON IMG
    2021-04-01 | PDF
    The purpose of this project is to measure the magnitude of the pollution reduction co-benefit generated by pricing congestion. Specifically, we estimate two empirical models: First, a model that examines the effects of traffic congestion, measured by cars per miles, on NO and NO2 emissions of vehicles in freeways. Second, a model that relates speed ...
  • Design and Analysis Procedures for Asphalt Mixtures Containing High RAP Contents andor RAS
    Design and Analysis Procedures for Asphalt Mixtures Containing High RAP Contents and/or RAS
    Mohammad, Louay ;
    Cao, Wei
    2021-04-01 | PDF
    Asphalt recycling has been implemented as a cost-effective and environmentally friendly technique in pavement construction activities. Currently, the most widely used recycled asphalts are contributed from reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS). In order to accommodate the recycled asphalts that are oxidatively aged, t ...
  • Phase II Reducing Portland Cement Content and Improving Concrete Durability
    Phase II - Reducing Portland Cement Content and Improving Concrete Durability
    Tia, Mang ;
    Chung, Hung-Wen
    2021-04-01 | PDF
    This study evaluated the effects of (1) reducing the cementitious paste volume (CPV) and (2) the use of optimized aggregate gradation (OAG) technique on Florida Class II, Class II - Bridge Deck, Class IV, and Class V concretes using portland limestone cement (PLC). The main findings from this study are as follows. (1) PLC concrete can provide simil ...
  • 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 ...
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