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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 5981 - 6000 of 36958 results
  • SocialTransportation Analytic Toolbox STAT for Transit Networks
    Social-Transportation Analytic Toolbox (STAT) for Transit Networks
    Liu, Xiaoyue Cathy ;
    Wei, Ran
    2019-07-01 | PDF
    This project builds an open-source, socio-transportation analytic (STAT) toolbox for public transit system planning in an effort to integrate social media and general transit feed specification (GTFS) data for transit agencies in evaluating and enhancing the performance of public transit systems. This toolbox is novel and essential to transit agenc ...
  • Development of an Inventory and Inspection Database Framework for Asset Management of MSE Walls
    Development of an Inventory and Inspection Database Framework for Asset Management of MSE Walls
    Sharma, Sunil ;
    Ibrahim, Ahmed
    2019-07-01 | PDF
    Currently, the Idaho Transportation Department (ITD) does not have an inventory of MSE walls, or procedures for their inspection and assessment. To initiate a process for compiling such information, this study collected information about MSE walls in Idaho, and assembled the material for use as a preliminary database. After considering many attribu ...
  • Truck Activity Analysis Using GPS Data
    Truck Activity Analysis Using GPS Data
    Hernandez, Sarah ;
    Williams, Brent
    2019-07-01 | PDF
    This project investigated large streams of truck Global Positioning System (GPS) data for statewide freight modeling and planning applications in Arkansas. Approximately 5% of the trucks represented movements entirely within state boundaries with average trip lengths of 30 miles and durations of 1 hour; 22% represented in and outbound movements wit ...
  • RealTime Signal Performance Measurement RTSPM
    Real-Time Signal Performance Measurement (RT-SPM)
    Jin, Peter J. ;
    Zhang, Tianya
    2019-07-01 | PDF
    Transportation professionals measure traffic signal system to improve efficiency and reliability of roadway network. Traffic signal performance measurement and visualization provide insights as operational tools to help traffic management center get more benefits from infrastructure investment. The primary objective of the research is to identify a ...
  • Healthy Living Childrens Respiratory Health and TrafficRelated Air Pollution in an Underserved Community
    Healthy Living, Children’s Respiratory Health, and Traffic-Related Air Pollution in an Underserved Community
    Li, Wen-Whai ;
    Jeon, Soyoung
    2019-07-01 | PDF
    This study characterizes the effects of traffic-related criteria air pollutants (particulate matter [PM]₂.₅, PM₁₀, ozone [O₃], nitrogen dioxide [NO₂]) on children with asthma living in near-road communities. The authors utilized portable air quality monitors to characterize air pollutants in near-road schools and conducted a concurrently panel-base ...
  • A Laboratory Study of ApronRiprap Design for SmallCulvert Outlets
    A Laboratory Study of Apron-Riprap Design for Small-Culvert Outlets
    Lyn, Dennis A. ;
    Saksena, Siddharth
    2019-07-01 | PDF
    The present study investigated primarily the appropriate stone-sizing of on-grade riprap aprons, and more specifically whether the current INDOT design policy may be overly conservative especially within the context of smaller culverts. In the study, laboratory experiments were performed with two pipe diameters, D = 4.25 in (0.35 ft) and 5.75 in (0 ...
  • Idaho Statewide Freight Data and Commodity SupplyChain Analysis
    Idaho Statewide Freight Data and Commodity Supply-Chain Analysis
    Jessup, Eric L. ;
    Hernandez, Salvador
    2019-07-01 | PDF
    This focus of this study commissioned by the Idaho Transportation Department Freight Office is on developing freight data that allows for a detailed understanding freight movement within and through the state and an improved understanding of the key freight supply-chains supporting the state’s economy. Choices regarding infrastructure improvements ...
  • Intelligent Transportation Systems Approach to Railroad Infrastructure Performance Evaluation Track Surface Abnormality Identification with SmartphoneBased App
    Intelligent Transportation Systems Approach to Railroad Infrastructure Performance Evaluation: Track Surface Abnormality Identification with Smartphone-Based App
    Lu, Pan ;
    Bridgelall, Raj
    2019-07-01 | PDF
    Federal track safety regulations require railroads to inspect all tracks in operation as often as twice weekly. Railroad companies deploy expensive and relatively slow methods using human inspectors and expensive automated inspection vehicles to inspect and monitor their rail tracks. The current practices are not only expensive and decrease rail pr ...
  • Evaluating Corrosivity of Geomaterials in MSE Walls Determination of Resistivity From Pore Water Chemistry
    Evaluating Corrosivity of Geomaterials in MSE Walls: Determination of Resistivity From Pore Water Chemistry
    Walker, W Shane ;
    Ghadimi, Shahrouz J.
    2019-07-01 | PDF
    It is critically important to predict the corrosivity of fill materials in mechanically-stabilized earth (MSE) walls which can cause corrosion of steel reinforcement and lead to structural failure. A common way of assessing the corrosivity of fill materials is to analyze readily soluble constituents such as chloride and sulfate. In this study, fill ...
  • OnSite Berths and Curbside Implications
    On-Site Berths and Curbside Implications
    Venigalla, Mohan ;
    Hancock, Kathleen
    2019-07-01 | PDF
    This study looked at factors related to freight trip generation in Washington, DC and urban environments. The study presents a comprehensive review of literature and practices regarding loading zones at different US cities; collected commercial vehicle parking occupancy data through video-monitoring at 20 different buildings in the District of Colu ...
  • Arizona Department of Transportation 2019 Research Peer Exchange April 910 2019 Phoenix Arizona
    Arizona Department of Transportation 2019 Research Peer Exchange, April 9-10, 2019, Phoenix, Arizona
    CTC & Associates LLC
    2019-07-01 | PDF
    The Arizona Department of Transportation (ADOT) Research Center hosted a peer exchange in Phoenix, Arizona, on April 9 and 10, 2019. The peer exchange was aimed at identifying exemplary practices for engaging internal DOT stakeholders throughout the entire research process. Representatives from Iowa DOT, Mississippi DOT, Montana DOT, North Carolina ...
  • Rapid Repair of Bridge Decks in Cold Weather
    Rapid Repair of Bridge Decks in Cold Weather
    Peiris, Abheetha ;
    Harik, Issam E.
    2019-07-01 | PDF
    Using regular concrete or mortar to repair potholes in concrete bridge decks is typically infeasible in cold weather due to extended set and curing times. However, several commercially available rapid-set repair materials can be used at temperatures near or below freezing. This study evaluated five such materials to assess their properties and dete ...
  • Monitoring the Cost Effectiveness of the Caltrans Freeway Service Patrol FSP SB 1 Funded Expansion
    Monitoring the Cost Effectiveness of the Caltrans Freeway Service Patrol (FSP) SB 1 Funded Expansion
    Mauch, Michael ;
    Skabardonis, Alexander
    2019-07-01 | PDF
    California’s Freeway Service Patrol (FSP) is a congestion mitigation program managed in partnership with metropolitan planning organizations (MPOs), CHP and Caltrans on California’s urban freeways. The program utilizes a fleet of roving tow and service trucks designed to reduce traffic congestion by efficiently getting disabled vehicles running aga ...
  • Sustainable Materials for Pavement Infrastructure Design and Performance of Asphalt Mixtures Containing Recycled Asphalt Shingles
    Sustainable Materials for Pavement Infrastructure: Design and Performance of Asphalt Mixtures Containing Recycled Asphalt Shingles
    Mohammad, Louay N. ;
    Cooper Jr, Samuel B
    2019-07-01 | PDF
    As the price of liquid asphalt continuously climbs, methods are being sought to decrease material costs, which will also have less impact on ecological systems without compromising material or pavement performance. The use of recycled materials is one method that can replace a percentage of their virgin counterparts, thus reducing the negative impa ...
  • Field Implementation of Direction Rumble Strips for Deterring WrongWay Entries
    Field Implementation of Direction Rumble Strips for Deterring Wrong-Way Entries
    Zhou, Huaguo ;
    Xue, Chennan
    2019-07-01 | PDF
    This report presents the field implementation results of three directional rumble strip (DRS) patterns designed to deter wrong-way (WW) freeway entries. Southbound off-ramps at Exits 208 and 284 on I-65 in Alabama were selected for implementation because they were ranked as high-risk locations by a network screening tool developed by Auburn Univers ...
  • Chemical Characterization of Asphalts Related to Their Performance
    Chemical Characterization of Asphalts Related to Their Performance
    Daly, William H. ;
    Negulescu, Ioan I.
    2019-07-01 | PDF
    In this project the researchers studied a correlation between molecular structure and corresponding compositional analysis of asphalt binders of conventional hot mix asphalt (HMA) mixtures as well as mixtures containing reclaimed asphalt pavement (RAP) and/or recycled asphalt shingles (RAS) with their cracking potential at intermediate temperature. ...
  • Vehicle Automation and Transportability of Crash Modification Factors
    Vehicle Automation and Transportability of Crash Modification Factors
    Davis, Gary ;
    Gao, Jingru
    2019-07-01 | PDF
    Although the Highway Safety Manual (HSM) now provides empirical tools for predicting the safety consequences of highway engineering decisions, these tools represent the prevailing driver and vehicle conditions in the United States during the last few decades. As automated vehicles improve in capability and increase in market share, these conditions ...
  • Investigation of Tack Coat Materials Tracking Performance
    Investigation of Tack Coat Materials Tracking Performance
    Bahia, Hussain U. ;
    Sufian, Abu
    2019-07-01 | PDF
    This research evaluated the performance of asphalt emulsion tack coat used in Wisconsin to provide recommendations that make tack coat usage more efficient and effective. The study focused on measuring curing as measured by moisture loss, tracking as measured by a bond strength test and a wheel tracking device in the lab, and Interlayer Shear Stren ...
  • Requirements for Use of FieldCast Proprietary UltraHighPerformance Concrete in Florida Summary
    Requirements for Use of Field-Cast, Proprietary Ultra-High-Performance Concrete in Florida [Summary]
    Riding, Kyle
    ORCID ICON IMG
    2019-07-01 | PDF
    University of Florida researchers developed a method to measure the UHPC tensile stress-strain relationship. They also developed a specification for material acceptance of field-cast UHPC.
  • Estimation of System Performance and Technology Impacts to Support Future Year Planning Summary
    Estimation of System Performance and Technology Impacts to Support Future Year Planning [Summary]
    Hadi, Mohammed
    ORCID ICON IMG
    2019-07-01 | PDF
    Florida International University researchers developed a plan for extending the Florida Intelligent Transportation System Evaluation Tool (FITSEVAL) with measurements and forecasting abilities that take advantage of state-of-the-art models, methods, and data from multiple sources to incorporate emerging technologies. This update primarily corrects ...
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