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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 3701 - 3720 of 36011 results
  • Development of a Connected Smart Vest for Improved Roadside Work Zone Safety
    Development of a Connected Smart Vest for Improved Roadside Work Zone Safety
    Roofigari-Esfahan, Nazila ;
    White, Elizabeth
    2021-04-01 | PDF
    Roadside work zones (WZs) present imminent safety threats for roadway workers as well as passing motorists. In 2016, 764 fatalities occurred in WZs in the United States due to motor vehicle traffic crashes. A number of factors (aging highway infrastructure, increased road work, increased levels of traffic and more nighttime WZs) have led to an incr ...
  • Implementation Phase of SPR 777 Study and Guidance for a Chip Seal Performance Specification
    Implementation Phase of SPR 777 Study and Guidance for a Chip Seal Performance Specification
    Buss, Ashley ;
    Guirguis, Minas
    2021-04-01 | PDF
    This report outlines the development and implementation phase of chip seal performance specification for Oregon. Two chip seal workshops were held to involve chip seal stakeholders including a variety of Oregon Department of Transportation (ODOT) personnel and contractors. A voluntary survey about the potential specification changes was developed a ...
  • SelfDriving Electric Vehicles for Smart and Sustainable Mobility Evaluation and Feasibility Study for Educational and Medical Campuses
    Self-Driving Electric Vehicles for Smart and Sustainable Mobility: Evaluation and Feasibility Study for Educational and Medical Campuses
    Sadek, Adel W ;
    Qiao, Chunming
    2021-04-01 | PDF
    Automated Vehicles (AVs) have the potential to improve transportation safety, increase system capacity, enhance mobility, and solve the first- and last- mile problem associated with public transportation. This project has three interrelated objectives: (1) to evaluate the technical feasibility, safety and reliability of a low-speed, self-driving sh ...
  • Translating Data Generated by the Transit App into Insights on Transportation Use in Greater Boston
    Translating Data Generated by the Transit App into Insights on Transportation Use in Greater Boston
    O'Brien, Daniel T ;
    Wang, Qi
    2021-04-01 | PDF
    Transit is an app that Massachusetts Bay Transit Authority (MBTA) riders can use to navigate the system and compare alternative routes. The data generated by the app are made available to MBTA by Transit and they are a rich resource for understanding the behavior of customers. The purpose of this project was to tap this unprecedented resource throu ...
  • Protecting Piers of Overhead Structures from Degradation Due to Snow and Ice Chemical and Material Usage Phase II
    Protecting Piers of Overhead Structures from Degradation Due to Snow and Ice Chemical and Material Usage Phase II
    Miller, Richard ;
    Nepal, Prateek
    2021-04-01 | PDF
    Chloride laden ice and snow thrown from plows can adhere to bridge piers. Eventually the chlorides migrate into the concrete and cause corrosion. This report looks at two methods of protecting bridge piers. One is a polyethylene shield and the other is a polyaspartic coating. The polyethylene shields were easy to install and could be removed for in ...
  • Development of Standard Methodology to Measure Sulfate Ions in PostTensioned Grouts
    Development of Standard Methodology to Measure Sulfate Ions in Post-Tensioned Grouts
    Permeh, Samanbar ;
    Lau, Kingsley
    2021-04-01 | PDF
    Steel corrosion in the deficient grout however was associated with elevated concentrations of sulfate ions stemming from the adverse influence of excess mix water and grout pre-hydration. There has been discussions for appropriate ways to address sulfate levels in grout including sulfate limits. Various test methodologies can include varying materi ...
  • Roadside RightsofWay As Pollinator Habitat A Literature Review
    Roadside Rights-of-Way As Pollinator Habitat: A Literature Review
    Du Clos, Brianne ;
    deMaynadier, Phillip
    2021-04-01 | PDF
    This report includes a review of peer-reviewed academic and non-peer reviewed gray literature describing ROW management practices and their effects on pollinator populations, focusing on applications of these practices in landscapes similar to those found in Maine and the northeast United States; that is, landscapes that are heavily forested and in ...
  • Associating Ridesourcing With Road Safety Outcomes Insights From Austin Texas
    Associating Ridesourcing With Road Safety Outcomes: Insights From Austin, Texas
    Kontou, Eleftheria ;
    McDonald, Noreen
    2021-04-01 | PDF
    Improving road safety and setting targets for reducing traffic-related crashes and deaths are highlighted as part of the United Nation's sustainable development goals and worldwide vision zero efforts. The advent of transportation network companies, such as ridesourcing, expands mobility options in cities and may impact road safety outcomes. We ana ...
  • Biopolymerized SlopeSubgrade Stabilization and Advanced Field Monitoring
    Biopolymerized Slope/Subgrade Stabilization and Advanced Field Monitoring
    Song, Chung R. ;
    Bitar, Layal
    2021-04-01 | PDF
    The slightly overconsolidated glacial tills and weathered shales in Midwestern states of the USA often show substantial strength degradation after construction. This strength reduction often causes time dependent slope failures along the roadside. This study investigated the possibility of applying biopolymer based soil modification techniques to m ...
  • 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 ...
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