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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 2121 - 2140 of 36114 results
  • 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) ...
  • Field Monitoring of Wicking Geotextile for Moisture Reduction in Pavements
    Field Monitoring of Wicking Geotextile for Moisture Reduction in Pavements
    Han, Jie ;
    Liu, Hao
    2023-03-01 | PDF
    Water is often detrimental to the performance of pavements since it reduces soil strength and modulus and provides sources for erosion and freeze-thaw of base courses and subgrade. A common approach to removing water within pavements is to provide a drainage system, which is effective only when the soil beneath the pavement is saturated or nearly s ...
  • AMR LeaderFollower System TMA Evaluation
    AMR Leader-Follower System TMA Evaluation
    Brown, Henry ;
    Edara, Praveen
    2023-03-01 | PDF
    To reduce worker injuries in truck mounted attenuator (TMA) crashes, the Missouri Department of Transportation (MoDOT) is piloting a Leader-Follower TMA system, which allows the worker to be removed from the follower vehicle, in two districts. The objectives of this research study are to evaluate MoDOT’s pilot program for Leader-Follower TMAs in tw ...
  • Promoting Native Roadside Plant Communities and Ensuring Successful Vegetation Establishment Practices
    Promoting Native Roadside Plant Communities and Ensuring Successful Vegetation Establishment Practices
    Askew, Shawn D ;
    Goatley, James M
    2023-03-01 | PDF
    The loss of vegetation from roadside activities can lead to erosion and an increased sediment load in stormwater ponds. Current VDOT procedures regarding approved seed blends and establishment practices have led to inconsistent vegetation establishment and greatly rely on introduced species. Growing concerns regarding the threat of introduced, inva ...
  • Updating 2019 Safe Corridors Reports
    Updating 2019 Safe Corridors Reports
    Hopwood, Cory ;
    Motamed, Megan
    2023-03-01 | PDF
    NJDOT, in conjunction with the Division of State Police, is required to submit a Safe Corridors Program Assessment Report annually under N.J.S.A. 39:3-20.4. Therefore, there is a need to provide results of the safe corridor areas, as well as the highway safety projects and programs paid for by the fund, within the past year to the Senate Transporta ...
  • Toward a Florida Automated Connected Electric and Shared ACES Transportation System Roadmap Phase II
    Toward a Florida Automated, Connected, Electric, and Shared (ACES) Transportation System Roadmap: Phase II
    Lin, Pei-Sung ;
    Wang, Zhenyu
    2023-03-01 | PDF
    Automated, connected, electric, and shared (ACES) technologies are rapidly evolving and will continue to impact the development of vehicles, infrastructure, communities, commerce, and the economy. Based on the Florida ACES transportation system roadmap for Florida developed in Phase I, this project aimed to engage with private industries to leverag ...
  • Putting Research Into Practice Mitigating Projects Missing Deadlines Implementation Summary
    Putting Research Into Practice: Mitigating Projects Missing Deadlines [Implementation Summary]
    Bossert, Justin ;
    Kester, Chris
    2023-03-01 | PDF
    All construction contracts specify a deadline, either a specific date or a length of time. Construction schedules are compressed to meet deadlines and avoiding delays is crucial to delivering a project on time.
  • Evaluation and Refinement of Minnesota Queue Warning Systems
    Evaluation and Refinement of Minnesota Queue Warning Systems
    Hourdos, John ;
    Robbennolt, Jake
    2023-03-01 | PDF
    In previous research, investigators developed and deployed two warning systems, including MN-QWARN, which was installed on a segment of Interstate 94 (I-94) with a historically high crash rate. This system targeted shockwaves or initial stages of congestion based on the understanding that not all congestion events create high risks for crashes. Cer ...
  • Asphalt Crack Treatment FAQs and Technical Resources
    Asphalt Crack Treatment FAQs and Technical Resources
    Knapek, Dan ;
    Boder, Brian
    2023-03-01 | PDF
    Crack treatment is one of the most used pavement preservation practices and although the technique is simple, there are several nuances that make it more of an art than science. The purpose of this document is to provide: • An overview of crack treatment, • Guidance on several FAQs, and • A high-level summary of several technical resources. Crack s ...
  • Impact of Polymer Modification on IDEALCT and IFIT for Cracking Resistance Evaluation of Asphalt Mixtures
    Impact of Polymer Modification on IDEAL-CT and I-FIT for Cracking Resistance Evaluation of Asphalt Mixtures
    Yin, Fan ;
    Chen, Chen
    2023-03-01 | PDF
    This study evaluated the impact of polymer modification, without changing the base binder, on the intermediate-temperature cracking resistance of asphalt mixtures characterized using the Indirect Tensile Asphalt Cracking Test (IDEAL-CT) and the Illinois Flexibility Index Test (I-FIT). Twelve asphalt mixtures prepared with two mix designs and six vi ...
  • LiDAR for Geotechnical Applications Project Capsule
    LiDAR for Geotechnical Applications [Project Capsule]
    Gautreau, Gavin
    2023-03-01 | PDF
    The research intends to focus on four objectives regarding LiDAR within Louisiana Department of Transportation (DOTD) for geotechnical applications: (1) Site investigation and reconnaissance for drilling operations. LiDAR scans identifying slopes and feasible areas for drilling access could save time and efforts, possibly reducing site visits. (2) ...
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