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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 2481 - 2500 of 36873 results
  • Establishment of Wildflower Islands to Enhance Roadside Health Ecological Value and Aesthetics Phase II
    Establishment of Wildflower Islands to Enhance Roadside Health, Ecological Value, and Aesthetics Phase II
    Ebbers, Jackson ;
    Hillhouse, Heidi
    2023-03-31 | PDF
    Roadsides play an ever-increasing role in sustaining biodiversity. In 2020, we launched a project on backslopes along Highways 2 and 77 evaluating seeding and mowing treatments to enhance beneficial forbs including milkweed (Asclepias spp.) species. Analyses showed that seeding increased forb diversity, total forb cover, and floristic quality. Howe ...
  • D1 Flex Beam Field Instrumentation Load Testing of Innovative Bridge Design
    D-1 Flex Beam Field Instrumentation & Load Testing of Innovative Bridge Design
    Gonzalez, Bryan ;
    Hodgson, Ian
    2023-03-31 | PDF
    This report presents a study of an innovative superstructure system, termed Flex Beam, for short-span highway bridge applications. The system is comprised of inverted steel tee sections embedded in a concrete deck. An innovative mechanism for interface shear transfer between steel and concrete is provided by transverse deck reinforcement bars which ...
  • Develop a Study for Geosynthetic Materials for Use in Reducing Pavement Section Thickness
    Develop a Study for Geosynthetic Materials for Use in Reducing Pavement Section Thickness
    Rodriguez, Julissa J. Larios ;
    Hajj, Elie Y
    2023-03-24 | PDF
    Geosynthetics have been used to reinforce aggregate base courses to increase the structural support from the base to the pavement structure. This project aims to develop a study framework to evaluate and quantify the structural benefits under Nevada conditions. To achieve this objective, a five-stage research plan was developed to support a control ...
  • Continuation of Carbon Nanotubes Additives for Structural and Highway Concrete
    Continuation of Carbon Nanotubes Additives for Structural and Highway Concrete
    Sachs, Steven G ;
    Sun, Zhe
    2023-03-15 | PDF
    The purpose of this project was to evaluate the performance of carbon nanotube (CNT)-reinforced concrete. Carbon nanotubes have exceptional mechanical properties and small scales. Combining them with composite material enables engineers to further modify material microstructure. Carbon nanotubes have been used extensively in modifying cement proper ...
  • Integrating Road Weather Technology Data in Highway Operations
    Integrating Road Weather Technology Data in Highway Operations
    Franz, Mark L. ;
    Pack, Michael L.
    2023-03-10 | PDF
    Inclement weather can significantly impact the performance of any transportation system, including roadways. Effective roadway operations and maintenance requires quality weather data to estimate real-time and near-future road conditions. While there are several sources of such data such as radar, Road Weather Information Systems (RWIS), and Mobile ...
  • Aerial Infrared Scanning of Bridge Decks for Detecting and Mapping Delaminations
    Aerial Infrared Scanning of Bridge Decks for Detecting and Mapping Delaminations
    Carmichael, Adam ;
    Bates, Spencer
    2023-03-02 | PDF
    The objective of this project was to demonstrate and evaluate a highly efficient and economical method for evaluation of the condition of bridge decks in Alaska. The method, Aerial Infrared Thermography (Aerial IR), implements traditional infrared thermography from a fixed-wing aircraft using high resolution infrared and visual cameras. To address ...
  • Freight Companies Can Share Assets to Achieve Cost and Emission Reductions and Transition to Zero Emission Vehicles Policy Brief
    Freight Companies Can Share Assets to Achieve Cost and Emission Reductions and Transition to Zero Emission Vehicles [Policy Brief]
    Jaller, Miguel ;
    Otero, Carlos
    2023-03-01 | PDF
    Researchers at the University of California, Davis developed a logistics decision-support tool that facilitates the joint routing of pick-ups and deliveries for cooperating entities to reduce environmental impacts and transport costs. The researchers implemented the tool in several hypothetical case studies to better understand the impact of joint ...
  • Evaluation of Driveway Assistance Devices in Signalized Work Zones Fact Sheet
    Evaluation of Driveway Assistance Devices in Signalized Work Zones [Fact Sheet]
    McAvoy, Deborah S. ;
    Naik, Bhaven
    2023-03-01 | PDF
    The overall goal of this research project is to evaluate performance of the DAD devices in comparison to temporary traffic signal devices and, based on the findings, provide recommendations to ODOT on their safety, effectiveness, and cost-efficiency for adoption in signalized work zones.
  • Qualitative and Quantitative Analysis to Advance Transportation
    Qualitative and Quantitative Analysis to Advance Transportation
    Elgart, Zachary ;
    Hansen, Todd
    2023-03-01 | PDF
    Measuring equity in transportation is vitally important to ensure that the transportation network serves the entire community without introducing barriers to access. However, not all methods for assessing transportation equity produce the same results or are appropriate for all scenarios—the analysis methods used should be selected to produce the h ...
  • Uncovering the Root Causes of Truck Rollover Crashes on Ramps
    Uncovering the Root Causes of Truck Rollover Crashes on Ramps
    Xie, Yuanchang ;
    Liu, Benyuan (Ben)
    2023-03-01 | PDF
    Highway ramps are hotspots of truck rollover crashes. Such crashes often block the entire ramp and cause severe congestion. Understanding the major causes of ramp truck rollovers is critical for developing effective countermeasures. This research utilizes drones to collect ramp traffic videos at seven high-risk ramps and develops an Oriented Mask-R ...
  • Development of Pavement Structural Analysis Tool PSAT for Iowa Local Roads
    Development of Pavement Structural Analysis Tool (PSAT) for Iowa Local Roads
    Citir, Nazik ;
    Ceylan, Halil
    2023-03-01 | PDF
    Iowa has three classes of public roads: state primary highways, county (secondary) roads, and city streets. Among these, Iowa county roads serve rural Iowa transport needs by assuring a public road connection (i.e., to local access roads) for serving as conduits that channel the flow of people and commodities to and from towns and terminals (i.e., ...
  • Evaluation of Driveway Assistance Devices in Signalized Work Zones
    Evaluation of Driveway Assistance Devices in Signalized Work Zones
    McAvoy, Deborah S. ;
    Naik, Bhaven
    2023-03-01 | PDF
    An evaluation was conducted along State Route 60, in Muskingum County, Ohio as associated with ODOT’s construction contract 210208, (PID 101004) to examine the performance differences between traditional temporary traffic signals and Driver Assistance Devices (DADs) at driveways in a work zone. The project consisted of a field and microsimulation a ...
  • Projected Changes in Flood Peak Discharge across Iowa A Flood Frequency Perspective
    Projected Changes in Flood Peak Discharge across Iowa: A Flood Frequency Perspective
    Villarini, Gabriele ;
    Krajewski, Witold F.
    2023-03-01 | PDF
    Numerous modeling studies point to an intensification of the hydrological cycle under projected climate warming, with increasing frequency of extreme events, including heavy rainfall and flooding. So, what would projected changes in flooding mean for the Iowa Department of Transportation (IDOT) and the bridges and structures that constitute Iowa’s ...
    Supporting Files
  • Developing a MultiCriteria Prioritization Tool to Identify Promising Locations for TransitOriented Developments TODs on WSDOTOwned Park and Ride Sites
    Developing a Multi-Criteria Prioritization Tool to Identify Promising Locations for Transit-Oriented Developments (TODs) on WSDOT-Owned Park and Ride Sites
    Shen, Qing ;
    Acolin, Arthur
    2023-03-01 | PDF
    Public agencies can take a leading role in supporting TOD by making land available to developers (selling or leasing land, potentially below market prices). With existing access to transit systems and often large land areas, park and rides that are publicly owned can be leveraged to support TOD uses, such as affordable housing, office space, small ...
  • Effectiveness of Rectangular Rapid Flashing Beacons RRFBs in Small and Rural Communities
    Effectiveness of Rectangular Rapid Flashing Beacons (RRFBs) in Small and Rural Communities
    Rowangould, Dana ;
    Sullivan, James
    2023-03-01 | PDF
    Ensuring the safety of pedestrians and cyclists in rural and small communities is becoming increasingly important as planners seek to encourage active travel and eliminate traffic-related injuries and fatalities, consistent with Vision Zero. One area of focus is the protection of vulnerable road users such as pedestrians, who face a significant ris ...
  • Balanced Mix Design for Surface Mixtures 2020 Field Trials
    Balanced Mix Design for Surface Mixtures: 2020 Field Trials
    Diefenderfer, Stacey D ;
    Habbouche, Jhony
    2023-03-01 | PDF
    The Virginia Department of Transportation (VDOT) has been working toward the implementation of balanced mix design (BMD) for several years. During that time, special provisions have been developed to address dense-graded surface mixtures with reclaimed asphalt pavement (RAP) contents up to 30% and with RAP contents of 40% and above. In 2020, five f ...
  • Construction and Materials Best Practices for Concrete Sidewalks Phase II LongTerm Performance and HotWeather Placement Effects
    Construction and Materials Best Practices for Concrete Sidewalks: Phase II – Long-Term Performance and Hot-Weather Placement Effects
    Peterman, Kara ;
    Brena, Sergio
    2023-03-01 | PDF
    This report summarizes the investigation of construction practices and materials to develop durable concrete sidewalks which can resist scaling damage caused by exposure to freezing environment and deicer application. Over 16 months, a field study accompanied by laboratory testing was conducted to identify factors that affect the performance and du ...
  • Assessing a Solar Project and a Virtual Power Purchase Agreement Between the Red Lake Nation and the Minnesota Department of Transportation
    Assessing a Solar Project and a Virtual Power Purchase Agreement Between the Red Lake Nation and the Minnesota Department of Transportation
    Chan, Gabriel ;
    Harrington, Elise
    2023-03-01 | PDF
    In this report, we analyze the feasibility of a northern Minnesota solar project and accompanying Virtual Power Purchase Agreement (VPPA) between the Minnesota Department of Transportation (MnDOT) and the Red Lake Nation. We analyze three sets of benefits for MnDOT: government-to-government relations, environmental, and economic. In government-to-g ...
  • Characterization of Soil and Rock for Transportation Infrastructure Using Seismic Methods in Wyoming
    Characterization of Soil and Rock for Transportation Infrastructure Using Seismic Methods in Wyoming
    Griffiths, Shawn C. ;
    Poudal, Rishav
    2023-03-01 | PDF
    WYDOT utilizes traditional soil borings, drive point analyses, rock coring methods, and lab investigations to identify and characterize the sub-surface soil. Previous experience with these traditional investigation techniques is good; however, current guidance from FHWA encourages the use on non-traditional investigation techniques. These can inclu ...
  • Development of a Methodology to Evaluate the Highway Safety Improvement Program
    Development of a Methodology to Evaluate the Highway Safety Improvement Program
    Lowry, Michael B. ;
    Ward, Criss R
    2023-03-01 | PDF
    The goal of this research study was to provide information and develop tools that can help the Idaho Transportation Department (ITD) conduct safety effectiveness evaluation consistently across the state, provide data-driven rationale for future investments, and to help prepare the evaluation section of the Highway Safety Improvement Program (HSIP) ...
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