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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 2681 - 2700 of 35959 results
  • Mitigating Stripping in Asphalt Mixtures
    Mitigating Stripping in Asphalt Mixtures
    Huang, Baoshan ;
    Xiao, Rui
    2022-05-01 | PDF
    Moisture damage is one of the major types of asphalt pavement distress along with rutting, fatigue cracking and low-temperature cracking. Moisture, in liquid or gas form, penetrates into the interface between aggregate and asphalt and strips aggregate particles of asphalt coating, resulting in stripping and raveling. The Tennessee Department of Tra ...
  • Division of Engineering Research on Call Agreement 34652 Task 3 Scour Prediction Tools
    Division of Engineering Research on Call Agreement #34652 Task #3 – Scour Prediction Tools
    Che, Daniel ;
    White, Kevin
    2022-05-01 | PDF
    The objective of this project is to compare the most recent ODOT procedures to currently recommended FHWA practices for predicting scour, and to develop a user-friendly spreadsheet solution for calculating/predicting scour at a structure based on the latest procedures. Examples of how to use the scour prediction tool are illustrated in the report.
  • Speed Enforcement in Work Zones and Synthesis on CostBenefit Assessment of Installing Speed Enforcement Cameras on INDOT Road Network
    Speed Enforcement in Work Zones and Synthesis on Cost-Benefit Assessment of Installing Speed Enforcement Cameras on INDOT Road Network
    Mathew, Jijo K ;
    Desai, Jairaj
    2022-05-01 | PDF
    Work zone safety is a high priority for transportation agencies across the United States. High speeds in construction zones are a well-documented risk factor that increases the frequency and severity of crashes. It is therefore important to understand the extent and severity of high-speed vehicles in and around construction work zones. This study u ...
  • Selfdeicing LED Signal
    Self-de-icing LED Signal
    Cai, Hongyi ;
    Schrock, Steven
    2022-05-01 | PDF
    This Pooled Fund project [Transportation Pooled Fund Study TPF-5(351)] was aimed at developing and demonstrating a new type of self-de-icing LED signal for highway intersections as a replacement for existing LED signal lights that remain too cold to prevent snow, sleet, and ice buildup on the lens and could cause accidents in snowy conditions. The ...
  • Effectiveness of Fog Seal on Chip Sealed Low Volume Roads
    Effectiveness of Fog Seal on Chip Sealed Low Volume Roads
    Rief, Michael J ;
    Indihar, Matthew
    2022-05-01 | PDF
    This report was commissioned to gather information on the current practices of fog seal over chip seal that are being used by Cities and Counties within Minnesota. The report discusses current best practices and value added when compared to a stand-alone chip seal project. The information provided in this report was based off survey results from mu ...
  • Systemic Analysis of Bicycle and Pedestrian Safety in Utah
    Systemic Analysis of Bicycle and Pedestrian Safety in Utah
    Singleton, Patrick A. ;
    Rahman, Md Rafiur
    2022-05-01 | PDF
    The objective of this systemic analysis of bicycle and pedestrian safety in Utah was to identify risk factors, potential treatment sites, and potential countermeasures. The systemic approach to roadway safety management is a proactive means of identifying risk factors, countermeasures, and (high-risk, rather than just high-crash) treatment location ...
  • Development of DroneAssisted Highway Mowing Operations Planning Monitoring and Verification Capabilities
    Development of Drone-Assisted Highway Mowing Operations Planning, Monitoring, and Verification Capabilities
    Irizarry, Javier ;
    Cho, Yong Kwon
    2022-05-01 | PDF
    This project focused on the development for the integration of unmanned aerial systems (UASs) and artificial intelligence (AI) to automate planning, monitoring, and performance verification of highway maintenance tasks within the Georgia Department of Transportation (GDOT). The current mowing assessment for verifying the performance of mowing contr ...
  • Surveying the Financial Conditions of Californias Public Transit Operators An Early to MidPandemic Comparison
    Surveying the Financial Conditions of California’s Public Transit Operators: An Early to Mid-Pandemic Comparison
    Siddiq, Fariba ;
    Wasserman, Jacob L.
    2022-05-01 | PDF
    Initially, the COVID-19 pandemic threatened to inflict severe and lasting damage to public transit in California. However, thanks to federal financial relief from three stimulus bills and stronger-than-expected bounce-back of tax revenues from state and local sources, transit agencies in 2022 have avoided that abyss—but still face an uncertain fina ...
  • Consultant Support for Intelligent Compaction and PaverMounted Thermal Profiling Projects in 20202021
    Consultant Support for Intelligent Compaction and Paver-Mounted Thermal Profiling Projects in 2020–2021
    Chang, George ;
    Gilliland, Amanda
    2022-05-01 | PDF
    Due to the success of the MoDOT 2017-2019 Intelligent Compaction and Paver-Mounted Thermal Profiling (IC-PMTP) projects that demonstrate the paving quality improvements on numerous field projects, MoDOT has established a plan that includes additional IC-PMTP projects in 2020 and using IC-PMTP data for acceptance in 2021. To ensure the continued suc ...
  • Traffic Analysis Tools Assessment Comparison and Validation Study
    Traffic Analysis Tools: Assessment, Comparison and Validation Study
    Rouphail, Nagui M. ;
    Samandar, Shoaib
    2022-05-01 | PDF
    This report summarizes the findings of a research project aimed at assessing the accuracy of both analytical and microsimulation tools in describing the operational performance of a variety of intersection and interchange types under North Carolina conditions. The three tools evaluated in this study were SYNCHRO10, SIDRA9 and Trans Modeler5. In add ...
  • Micromobility Trip Characteristics Transit Connections and COVID19 Effects
    Micromobility Trip Characteristics, Transit Connections, and COVID-19 Effects
    Fukushige, Tatsuya ;
    Fitch, Dillon T.
    2022-05-01 | PDF
    While micromobility services (e.g., bikeshare, e-bike share, e-scooter share) hold great potential for providing clean travel, estimating the effects of those services on vehicle miles traveled and reducing greenhouse gases is challenging. To address some of the challenges, this study examined survey, micromobility, and transit data collected from ...
  • Evaluation of Traffic Speed Deflectometer for Collecting Network Level Pavement Structural Data in Tennessee
    Evaluation of Traffic Speed Deflectometer for Collecting Network Level Pavement Structural Data in Tennessee
    Huang, Baoshan ;
    Zhang, Miaomiao
    2022-05-01 | PDF
    The Traffic Speed Deflectometer (TSD) overcomes the Falling Weight Deflectometer (FWD) limitations in terms of traffic interruption and testing inefficiency, which has been used for network-level pavement structural evaluation. However, some challenges exist as applying the TSD for routine survey works. A comparison of pavement response under the T ...
  • Raised Pavement Markers RPMs Assessment Using Highway Speed Mobile Retroreflectivity Technology Summary
    Raised Pavement Markers (RPMs) Assessment Using Highway Speed Mobile Retroreflectivity Technology [Summary]
    Fletcher, James H.
    2022-05-01 | PDF
    Raised pavement markers (RPMs) are common on Florida roadways. They improve the visibility of driving lanes under wet or nighttime conditions, especially on rural roads where illumination may be lacking. The effectiveness of RPMs is due to their retroreflectivity, which is the ability to reflect light back toward its source (for example, a driver’s ...
  • RealTime Signal Performance Measurement Phase Data and Functionality Enhancement Large Scale Deployment Connected and Autonomous Vehicles Integration Technical Brief
    Real-Time Signal Performance Measurement Phase Ⅱ: Data and Functionality Enhancement, Large Scale Deployment, Connected and Autonomous Vehicles Integration [Technical Brief]
    Jin, Peter J. ;
    Brennan, Thomas M. Jr.
    2022-05-01 | PDF
    The primary objective of the second phase of this project is to develop and deploy a significantly enhanced version of the original toolbox, NJDOT ATSPM 2.0, along with a pilot study on the integration of adaptive signal controllers with CAV technologies. NJDOT arterial management operators can then use the ATSPM platform to generate key performanc ...
  • Effect of Realtime Traffic Data on Truck Diversion Routing on I75 Summary
    Effect of Real-time Traffic Data on Truck Diversion Routing on I-75 [Summary]
    Oloufa, Amr
    2022-05-01 | PDF
    University of Central Florida researchers developed a system for collecting real-time information about cars and trucks on Interstate highways. A second system uses this data to recommend appropriate diversion routes.
  • Alternative Funding Approaches for Iowa Roads Tech Brief
    Alternative Funding Approaches for Iowa Roads [Tech Brief]
    Iowa Highway Research Board
    2022-05-01 | PDF
    TR-790: Alternative Funding Approaches for Iowa Roads provides the Iowa Highway Research Board (IHRB) with near-term and long-range funding recommendations to address ongoing road and bridge needs across the State of Iowa (the State) based on transportation industry research, academic research, technical analyses, and feedback from the project’s Te ...
  • Evaluating the Usage of Culverts and Bridges by Wildlife in Arkansas
    Evaluating the Usage of Culverts and Bridges by Wildlife in Arkansas
    Srebalus, Madison
    2022-05-01 | PDF
    Vehicle collisions with animals threaten the lives and safety of wildlife and motorists. In an attempt to reduce vehicle collisions with animals, additional infrastructure was installed under bridges and within culverts to allow wildlife to pass beneath sections of highway. Photo evidence suggests that wildlife will usually use these structures, an ...
  • Development of InSitu Sensing Method for the Monitoring of WaterCement WC Values and the Effectiveness of Curing Concrete
    Development of In-Situ Sensing Method for the Monitoring of Water-Cement (W/C) Values and the Effectiveness of Curing Concrete
    He, Rui ;
    Lu, Na (Luna)
    2022-05-01 | PDF
    As the most widely used construction material, concrete is very durable and can provide long service life without extensive maintenance. The strength and durability of concrete are primarily influenced by the initial water-cement ratio value (w/c), and the curing condition during the hardening process also influences its performance. The w/c value ...
  • Guidelines for Activating Ramp Meters During OffPeak Hours and Weekends
    Guidelines for Activating Ramp Meters During Off-Peak Hours and Weekends
    Alluri, Priyanka ;
    Sando, Thobias
    2022-05-01 | PDF
    Ramp metering is a Transportation Systems Management and Operations (TSM&O) strategy that utilizes signals installed at freeway on-ramps to dynamically manage traffic entering the freeway. Ramp metering signals (RMSs) are usually activated during peak hours to alleviate recurring congestion. However, recurrent congestion during peak hours constitut ...
  • Division of Operations Research OnCall ROC Task3 Measuring ODOTs Towing Recovery Incentive Payments TRIP Program
    Division of Operations Research On-Call (ROC) Task#3 - Measuring ODOT’s Towing Recovery Incentive Payments (TRIP) Program
    Lee, Kevin ;
    Laffey, Sean
    2022-05-01 | PDF
    ODOT funded this study to quantify the benefits of the Towing Recovery Incentive Payments (TRIP) program (user delay, safety, and environmental impact) and to obtain a comparison of ODOT’s TRIP Program performance relative to other states, especially in regards to commercial vehicle clearance times.
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