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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 4081 - 4100 of 36011 results
  • To Automate Detecting Quantifying and Mapping of Delamination via Arial Thermography
    To Automate Detecting, Quantifying and Mapping of Delamination via Arial Thermography
    Shen, Zhigang ;
    Cheng, Chongsheng
    2020-12-01 | PDF
    The goal of this project is to develop a UAV-based Arial thermographic method to detect and map the delamination on concrete bridge decks. Several image processing methods such as level-set and machine-learning were developed in this project. The developed method is high-efficient and low-cost and requires no-traffic-closure during the surveying pr ...
  • Modernize Hydrologic Prediction Processes by Creating Custom Statewide SSURGO Green and Ampt Parameter Database Tasks 2 3 Green and Ampt Rainfall Loss Parameters
    Modernize Hydrologic Prediction Processes by Creating Custom Statewide SSURGO Green and Ampt Parameter Database Tasks 2 & 3: Green and Ampt Rainfall Loss Parameters
    JE Fuller Hydrology & Geomorphology, Inc.
    2020-12-01 | PDF
    This section is a continuation of work by Arizona Department of Transportation (ADOT) to develop Green and Ampt loss parameters for soils using methods developed by Saxton and Rawls (2006). Unless otherwise noted, methods for determining rainfall loss parameters are consistent with those developed by Mohave County and are included in the Drainage D ...
  • Traffic Safety Improvements at Low Water Crossings Project Summary
    Traffic Safety Improvements at Low Water Crossings [Project Summary]
    Dobrovolny, Chiara Silvestri ;
    Balke, Kevin N.
    2020-11-30 | PDF
    The researchers explored how the Texas Department of Transportation (TxDOT) might use easy, low-cost countermeasures to improve safety at LWCs. Countermeasures were focused on enhanced delineation techniques, improved flood detection sensors, active and passive warning device deployment, and connected vehicle technology integration to increase driv ...
  • Guidelines for Left Turn Signal Phasing Options by TimeofDay A Safety and Operational Study
    Guidelines for Left Turn Signal Phasing Options by Time-of-Day: A Safety and Operational Study
    Cunningham, Chris ;
    Rouphail, Nagui
    2020-11-30 | PDF
    In recent years, North Carolina has been increasingly adopting a flashing yellow arrow (FYA) traffic control for protected-permitted (PPLT) and permitted left turns. The use of three and four section heads with FYA’s is believed to minimize driver confusion between the conventional green ball and green arrow, increasing safety by reducing the poten ...
  • Quantifying the Impact of Rockfall on the Mobility of Critical Transportation Corridors
    Quantifying the Impact of Rockfall on the Mobility of Critical Transportation Corridors
    Cunningham, Keith W. ;
    Leshchinsky, Ben A.
    2020-11-30 | PDF
    This work developed a framework to assist transportation planners and managers (and others) in making informed resource allocation decisions based on the risks that rockfalls pose to the mobility of critical highway corridors. Transportation agencies, already faced with difficult asset management decisions, will benefit from a data-driven framework ...
  • Investigating the Vulnerability of Motorcyclists to Crashes and Injury
    Investigating the Vulnerability of Motorcyclists to Crashes and Injury
    Khattak, Asad ;
    Wali, Behram
    2020-11-30 | PDF
    Motorcyclists represent a segment of vulnerable road users that have high levels of risk, mostly because they lack protection. There are about 5,000 motorcyclist fatalities every year in the US. In response, the U.S. Congress has passed legislation initiating comprehensive research that identifies the causes of motorcycle crashes. This in turn resu ...
  • Studies to Develop Guidelines on Work Zone Barrier Use on Freeways Project Summary
    Studies to Develop Guidelines on Work Zone Barrier Use on Freeways: Project Summary
    Ullman, Gerald L. ;
    Rista, Emira
    2020-11-30 | PDF
    Based on the results of the tasks performed, the researchers developed recommended guidelines for use by work zone designers to help determine: • When temporary barriers should be used in work zones. • How to assess the trade-offs in alternative temporary barrier deployment options upon expected work zone crashes, especially when the alternatives r ...
  • Multiresolution Analysis of the Impacts of Complete Streets on Efficiency Safety and Environment of Urban Corridors
    Multiresolution Analysis of the Impacts of Complete Streets on Efficiency, Safety and Environment of Urban Corridors
    Stevanovic, Aleksander ;
    Kan, David
    2020-11-30 | PDF
    In recent years, many DOTs and other public agencies consider implementing Complete Street designs to make our road infrastructure friendlier for multimodal users. This project developed multiresolution analysis methodologies to quantitatively assess the effectiveness and impact of Complete Street designs. Case studies were performed using the Salt ...
  • Vehicle Connectivity and Automation A Sibling Relationship
    Vehicle Connectivity and Automation: A Sibling Relationship
    Ha, Paul ;
    Chen, Sikai
    2020-11-26 | PDF
    The evolution of scientific advances has often been characterized by the amalgamation of two or more technologies. With respect to vehicle connectivity and automation, recent literature suggests that these two emerging transportation technologies can and will jointly and profoundly shape the future of transportation. However, it is not certain how ...
  • Quantifying the Duration of the Corrosion Propagation Stage in Stainless Steel Reinforcement
    Quantifying the Duration of the Corrosion Propagation Stage in Stainless Steel Reinforcement
    Orozco Martinez, Nelly S ;
    Saire Yanez, Julio
    2020-11-25 | PDF
    Present durability projections for concrete reinforced with stainless steel (SS) are limited in that, while accounting for a substantial increase in the corrosion initiation stage (CIS) duration, credit tends not to be given for any added corrosion propagation stage (CPS) duration over that of carbon steel (CS). The objectives of this work were to: ...
  • Instantaneous Hybridization Factor IHF Development for HEV EnergyEmissions Analyses Using RealWorld OnBoard Data
    Instantaneous Hybridization Factor (IHF) Development for HEV Energy-Emissions Analyses Using Real-World, On-Board Data
    Holmen, Britt A ;
    Robinson, Mitchell K.
    2020-11-22 | PDF
    Past research has shown on-road emissions patterns unique to HEVs, indicating the need to account for them in emissions models. The main objective of this work is to outline a framework for development of new HEV emissions models based on current knowledge of CV emissions. The premise is that accurate knowledge of the instantaneous (1 Hz) power spl ...
  • Using Municipal Vehicles as Sensor Platforms to Monitor the Health and Performance of the Traffic Control System
    Using Municipal Vehicles as Sensor Platforms to Monitor the Health and Performance of the Traffic Control System
    McCord, Mark R. ;
    Mishalani, Rabi G.
    2020-11-20 | PDF
    In this study, sets of video imagery are obtained from transit buses in regular service on The Ohio State University campus and processed into time-of-day traffic volume estimates on major campus roadways. The traffic volume estimates are obtained from vehicles identified in the video imagery using an approach previously developed by the investigat ...
  • Using Municipal Vehicles as Sensor Platforms to Monitor the Health and Performance of the Traffic Control System [supporting datasets]
    McCord, Mark R. ;
    Mishalani, Rabi G.
    2020-11-20 | XLSX
    In this study, sets of video imagery are obtained from transit buses in regular service on The Ohio State University campus and processed into time-of-day traffic volume estimates on major campus roadways. The traffic volume estimates are obtained from vehicles identified in the video imagery using an approach previously developed by the investigat ...
    Dataset Supporting Files
  • Combining Truck and Vessel Tracking Data to Estimate Performance and Impacts of Inland Ports [supporting datasets]
    Hernandez, Sarah V ;
    Asborno, Magdalena I
    2020-11-18 | ZIP
    The purpose of this project is to estimate the performance of multi-modal supply chains that use inland waterway ports. This is accomplished by developing a method to fuse publicly available datasets including truck and marine vessel tracking data and lock performance data. The study builds on a growing body of research related to multi-modal freig ...
    Dataset Supporting Files
  • Storm Water Infiltration and Pollinator Habitat Zones Along Highways
    Storm Water Infiltration and Pollinator Habitat Zones Along Highways
    McLaughlin, Richard A. ;
    Ashraah, Shaddy H
    2020-11-17 | PDF
    This project explored the possibilities of managing soils on new and existing roadside areas to reduce runoff through increased infiltration. This was pursued through several greenhouse studies, controlled field plots at three sites monitored for three years, and several installations on existing roadside areas. Tillage was very beneficial for impr ...
  • How Mobility and Accessibility Affect Crime Rates Insights from Mobile Device Location Data
    How Mobility and Accessibility Affect Crime Rates: Insights from Mobile Device Location Data
    Zhang, Lei ;
    Yang, Mofeng
    2020-11-10 | PDF
    This research study investigates the possible correlations between mobility, accessibility, and crime rate. A rich mobile device location dataset including detailed anonymized location traces of the mobile devices observed in the City of Baltimore was combined with the police arrest records to study how mobility and accessibility affect neighborhoo ...
  • Distributed Optimization of Traffic Signals in Arterial Networks
    Distributed Optimization of Traffic Signals in Arterial Networks
    Fei, Xinyu ;
    Wang, Xingmin
    2020-11-10 | PDF
    Presentation on Distributed Optimization of Traffic Signals in Arterial Networks-INFORMS Annual Meeting, Nov. 10, 2020.
  • Development of a Standardized Buttress for Approach Guardrail Transitions
    Development of a Standardized Buttress for Approach Guardrail Transitions
    Rosenbaugh, Scott K. ;
    Faller, Ronald K.
    2020-11-10 | PDF
    Approach guardrail transitions (AGTs) incorporate increased post and rail sizes, reduced post spacings, specialized buttress end geometries, and other roadway features to smoothly transition from deformable W-beam guardrail to rigid barriers. This transition in barrier lateral stiffness requires specific combinations of these components to function ...
  • Dynamic Testing and Evaluation of CulvertMounted StrongPost MGS to TL3 Guidelines of MASH 2016
    Dynamic Testing and Evaluation of Culvert-Mounted, Strong-Post MGS to TL-3 Guidelines of MASH 2016
    Pajouh, Mojdeh Asadollahi ;
    Bielenberg, Robert W.
    2020-11-02 | PDF
    A modified design of the Midwest Guardrail System (MGS) was evaluated for installation on a low-fill culvert with a strong-post attachment using to the culvert, half-post spacing, and a 12-in. (305-mm) offset from the back of the post to the culvert headwall through full-scale crash testing. A four-cell, concrete culvert with 8-in. (203-mm) thick s ...
  • Develop a GISbased Megaregion Transportation Planning Model
    Develop a GIS-based Megaregion Transportation Planning Model
    Pan, Qisheng ;
    Chun, Bumseok
    2020-11-01 | PDF
    Few studies have focused on the development and implementation of megaregional transportation models. It is a big challenge to build such kind of models because they need to ensure theoretical soundness and methodological validity in academic and professional studies while at the same time to meet the expectation of public agency on the models for ...
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