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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 3721 - 3740 of 36908 results
  • Studies to Develop Guidelines on Work Zone Barrier Use on Freeways
    Studies to Develop Guidelines on Work Zone Barrier Use on Freeways
    Ullman, Gerald L. ;
    Rista, Emira
    2021-09-01 | PDF
    This report describes research efforts to: • Investigate the issues affecting temporary barrier deployment in work zones with constrained cross sections. • Identify and evaluate available options to potentially address those issues. • Develop improved guidelines regarding barrier deployment on Texas freeways. Efforts included: • A review of literat ...
  • Catch Basins and Manholes Products Installation and Settlement and Heave Mitigation
    Catch Basins and Manholes: Products, Installation, and Settlement and Heave Mitigation
    Waller, Brynley Nadziejka ;
    Tompkins, Derek
    2021-09-01 | PDF
    Practices for constructing and repairing catch basins and manholes vary across Minnesota municipalities and counties. There are a variety of products available for building a catch basin or manhole, sealing structure joints, and helping reduce infiltration and intrusion. Currently, there is very little documentation on the local experience with cat ...
  • 2021 Alaska Department of Transportation and Public Facilities Research Peer Exchange Summary Report FHWAs Experimental Features Program and Diversity Equity and Inclusion in Research Practices and Project Selection
    2021 Alaska Department of Transportation and Public Facilities Research Peer Exchange Summary Report: FHWA’s Experimental Features Program and Diversity, Equity, and Inclusion in Research Practices and Project Selection
    Texas A&M Transportation Institute
    2021-09-01 | PDF
    The Research, Development & Technology Transfer office at the Alaska Department of Transportation & Public Facilities (DOT&PF) hosted a virtual research peer exchange to discuss the fundamentals of FHWA’s Experimental Features Program, implementing diversity, equity, and inclusion in research practices and project selection, and the best practices ...
  • School Traffic Trip Generation Calculator Evaluation and Data Collection
    School Traffic Trip Generation Calculator Evaluation and Data Collection
    Kearns, Brendan ;
    Davis, Joy
    2021-09-01 | PDF
    This project focused on the collection of new data to add to the NCDOT School Traffic Calculator (STC), with a specific focus on estimates generated for vehicular rates and queue length. School travel data was collected at schools across North Carolina. This sample included schools of various types in varied geographic areas. Schools continue to be ...
  • Draft Specification for Compaction Monitoring System
    Draft Specification for Compaction Monitoring System
    Crockford, Bill ;
    Liu, Wenting
    2021-09-01 | PDF
    The scope of this research is to use the compaction monitoring system to obtain a real-time and post-construction assessment of breakdown roller compaction effectiveness. This method includes procedures for determining compaction index (CI) using a compaction monitoring system (CMS). This method is not to be used for pay factor or acceptance decisi ...
  • Test Procedure for GPR for Asphalt Mixture Construction
    Test Procedure for GPR for Asphalt Mixture Construction
    Wilson, Bryan ;
    Sebesta, Stephen
    2021-09-01 | PDF
    The scope of this study was to obtain a density profile of an asphalt paving project using ground penetrating radar (GPR). This document includes procedures for general system calibration, calibration of the GPR to the specific asphalt mixture, data collection, analysis procedures, and report summary.
  • Autonomous Traffic Mobile Attenuator ATMA Tabletop Exercise 2021 Summary Report
    Autonomous Traffic Mobile Attenuator (ATMA) Tabletop Exercise 2021 Summary Report
    Morehead, William ;
    Peterson, Jake
    2021-09-01 | PDF
    The Autonomous Maintenance Technology Pooled Fund, TPF 5(380) contracted with All Clear Emergency Management Group to develop, facilitate, and evaluate a Pooled Fund wide tabletop exercise involving the Autonomous Traffic Mobile Attenuator (ATMA)/Autonomous Impact Protection Vehicle (AIPV) crash. The scope of this summary report includes the design ...
  • Impact of Connected and Autonomous Vehicles on Nontraditional Intersection Design Superstreets
    Impact of Connected and Autonomous Vehicles on Nontraditional Intersection Design: Superstreets
    Fan, Wei (David) ;
    Liu, Shaojie
    2021-09-01 | PDF
    Congestion has been becoming a critical issue for transportation professionals as it increases travel time, energy use and pollutant emissions. Thanks to recent technology development of wireless communication and artificial intelligence, connected and autonomous vehicles (CAVs) become a promising and practical approach to increasing road capacity. ...
  • Machine Learningbased Trajectory Optimization of Connected and Autonomous Vehicles
    Machine Learning-based Trajectory Optimization of Connected and Autonomous Vehicles
    Fan, Wei (David) ;
    Liu, Pengfei
    2021-09-01 | PDF
    Connected and autonomous vehicle (CAV) technologies provide solutions to the existing problems of the transportation systems. As widely known, CAVs can communicate with each other so that they can have coordinated accelerating or decelerating movements. In this manner, CAVs only need a smaller headway which will lead to a higher roadway capacity. F ...
  • Travel Time Forecasting on a Freeway Corridor a Dynamic Information Fusion Model based on the Random Forests Approach
    Travel Time Forecasting on a Freeway Corridor: a Dynamic Information Fusion Model based on the Random Forests Approach
    Fan, Wei (David) ;
    Qiu, Bo
    2021-09-01 | PDF
    No Description
  • Best Practice Operation of Reversible Express Lanes for the Kennedy Expressway
    Best Practice Operation of Reversible Express Lanes for the Kennedy Expressway
    Mohammadian, Abolfazl ;
    Parsa, Amir Bahador
    2021-09-01 | PDF
    Reversible lanes in Chicago's Kennedy Expressway are an available infrastructure that can significantly improve traffic performance; however, a special focus on congestion management is required to improve their operation. This research project aims to evaluate and improve the operation of reversible lanes in the Kennedy Expressway. The Kennedy Exp ...
  • EarlyAge Properties of HighVolume Fly Ash Concrete Mixes for Pavement Volume 2
    Early-Age Properties of High-Volume Fly Ash Concrete Mixes for Pavement: Volume 2
    Baral, Aniruddha ;
    Roesler, Jeffrey R.
    2021-09-01 | PDF
    High-volume fly ash concrete (HVFAC) is more cost-efficient, sustainable, and durable than conventional concrete. This report presents a state-of-the-art review of HVFAC properties and different fly ash characterization methods. The main challenges identified for HVFAC for pavements are its early-age properties such as air entrainment, setting time ...
  • Feasibility Analysis of Realtime Intersection Data Collection and Processing Using Drones
    Feasibility Analysis of Real-time Intersection Data Collection and Processing Using Drones
    Ozguven, Eren Erman ;
    Karaer, Alican
    2021-09-01 | PDF
    Traditional data collection techniques at intersections are known to be time consuming and costly while handling the complexity associated with the heavy traffic volume and travel demand on today's roadways. Therefore, transportation agencies have been searching for more innovative, safer, and cheaper data collection solutions to have a faster and ...
  • Collaborative Research Project to Coordinate the Data from the CRASH Predictive Analytics Program Between TDOT and TDOSHS
    Collaborative Research Project to Coordinate the Data from the CRASH Predictive Analytics Program Between TDOT and TDOSHS
    Baroud, Hiba ;
    Dubey, Abhishek
    2021-09-01 | PDF
    Emergency Response Management (ERM) necessitates the use of models capable of predicting the spatial-temporal likelihood of incident occurrence. These models are used for proactive stationing in order to reduce overall response time. Traditional methods simply aggregate past incidents over space and time; such approaches fail to make useful short-t ...
  • Evaluating Mobility Impacts of Construction Workzones on Utah Transportation System Using Machine Learning Techniques
    Evaluating Mobility Impacts of Construction Workzones on Utah Transportation System Using Machine Learning Techniques
    Mashhadi, Ali Hassandokht ;
    Rashidi, Abbas
    2021-09-01 | PDF
    Construction work zones are inevitable parts of daily operations at roadway systems. They have a significant impact on traffic conditions and the mobility of roadway systems. The traffic impacts of work zones could significantly vary due to several interacting factors such as work zone factors (work zone location and layout, length of the closure, ...
  • Detecting Driver Drowsiness With MultiSensor Data Fusion Combined With Machine Learning
    Detecting Driver Drowsiness With Multi-Sensor Data Fusion Combined With Machine Learning
    Kulhandjian, Hovannes
    ORCID ICON IMG
    2021-09-01 | PDF
    According to the National Highway Traffic Safety Administration, in 2017 drowsy driving resulted in 50,000 injuries across 91,000 police-reported accidents, as well as almost 800 deaths. Through the application of visual and radar sensors combined with machine learning, this research developed a drowsy driver detection system aimed to prevent poten ...
  • Improving and Communicating Speed Management Practices Project Summary Report
    Improving and Communicating Speed Management Practices: Project Summary Report
    Fitzpatrick, Kay ;
    Venglar, Steven P.
    2021-08-31 | PDF
    Posted speed limits (PSLs) are a highly complex issue involving engineering, human factors, and political and societal concerns. On a national level, recent research and calls to change how speed limit are set, especially for city streets, have generated extensive discussion of future speed-limit-setting procedures. Within this Texas Department of ...
  • Automated and Connected Vehicle AVCV Test Bed To Improve Transit Bicycle and Pedestrian SafetyPhase III Project Summary
    Automated and Connected Vehicle (AV/CV) Test Bed To Improve Transit, Bicycle, and Pedestrian Safety—Phase III [Project Summary]
    Turnbull, Katherine F. ;
    Sunkari, Srinivasa
    2021-08-31 | PDF
    Public transit vehicles, pedestrians, and bicyclists share roads in urban, suburban, and rural environments in Texas. Signalized intersections in urban areas are complex shared spaces where crashes involving transit vehicles, bicyclists, and pedestrians can occur. This research explored the potential of automated and connected vehicle (AV/CV) techn ...
  • Research on Dimensionless Unit Hydrograph and Time of Concentration for Maryland Watersheds
    Research on Dimensionless Unit Hydrograph and Time of Concentration for Maryland Watersheds
    Brubaker, Kaye L ;
    Karam Zadeh, Mani Shehni
    2021-08-31 | PDF
    Observed data from 100 rainfall-runoff events on 54 watersheds in Maryland and Delaware were used to investigate two watershed characteristics: the dimensionless unit hydrograph (DUH) and time of concentration (Tc). Streamflow hydrograph data were obtained from US Geological Survey gaging stations. Event hyetographs were generated from US Weather S ...
  • Work Zone Traffic Engineering Strategies for Flagger Stations and Lane Closures Project Summary
    Work Zone Traffic Engineering Strategies for Flagger Stations and Lane Closures [Project Summary]
    Theiss, LuAnn ;
    Finley, Melisa D.
    2021-08-31 | PDF
    Work zones in Texas experience significant numbers of end-of-queue crashes. Research was needed to identify and evaluate countermeasures for these crashes. The objective of this research project was to identify and evaluate strategies to mitigate end-of-queue crashes at flagging stations on two-lane roads.
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