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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 6541 - 6560 of 36101 results
  • MASH TL3 Evaluation of the TxDOT TL3 LowProfile Barrier for High Speed Applications
    MASH TL-3 Evaluation of the TxDOT TL-3 Low-Profile Barrier for High Speed Applications
    Dobrovolny, Chiara Silvestri ;
    Shi, Shengyi
    2018-09-01 | PDF
    In response to the implementation requirements set forth by the Federal Highway Administration, the Texas Department of Transportation Bridge, Design, Maintenance, and Traffic Operations Divisions reviewed their standards for roadside safety devices and identified those devices that require testing and evaluation to assess AASHTO Manual for Assessi ...
  • Developing and Validating a Model of LeftTurn Crashes to Support Safer Design and Operations
    Developing and Validating a Model of Left-Turn Crashes to Support Safer Design and Operations
    Davis, Gary A. ;
    Gao, Jingru
    2018-09-01 | PDF
    This report documents work done to advance the state of art in crash simulation. This includes: (1) A field study to collect data on drivers’ left-turn gap acceptance and turning times, and development of statistical models that can be incorporated into a crash simulation model; (2) The use of Markov Chain Monte Carlo computational tools to quantif ...
  • Maximum Allowable Deflection by Light Weight Deflectometer and Its Calibration and Verification
    Maximum Allowable Deflection by Light Weight Deflectometer and Its Calibration and Verification
    Zhao, Guangyuan ;
    Yao, Yao
    2018-09-01 | PDF
    Implementing a quality assurance (QA) process for compaction of aggregates using light weight deflectometer (LWD) requires construction of a100 ft. long, 24 ft. wide test section prior to other uses by Indiana Department of Transportation (INDOT). However, there are numerous cases where aggregates are used in construction of subgrade, subbase cours ...
  • Realty Newsletter Fall 2018
    Realty Newsletter - Fall 2018
    United States. Department of Transportation. Federal Highway Administration. Office of Real Estate Services
    2018-09-01 | PDF
    The Federal Highway Administration's (FHWA) Office of Real Estate Services Newsletter is a resource which is intended to provide right-of-way professionals with the latest best practices, research results, training information, and information on policy and regulatory updates to ensure that Federal, State and local right-of-way program delivery is ...
  • Risk Mitigation Strategies to Enhance the Delivery of Highway Projects
    Risk Mitigation Strategies to Enhance the Delivery of Highway Projects
    Ashuri, Baabak ;
    Moradi, Arash
    2018-09-01 | PDF
    State departments of transportation (DOTs) face the challenges of identifying project issues, understanding the nature of project risks, and mitigating the risks early in the concept- and scope-development phases of a project. Subject-matter experts of functional groups in the state transportation agency have critical knowledge in identifying poten ...
  • Simplified Standard Penetration Test PerformanceBased Assessment of Liquefaction and Effects Updated Liquefaction Parameter Mapping Addendum Report
    Simplified Standard Penetration Test Performance-Based Assessment of Liquefaction and Effects: Updated Liquefaction Parameter Mapping [Addendum Report]
    Franke, Kevin W
    2018-09-01 | PDF
    The purpose of this addendum report is to document the process used to develop updated standard penetration test (SPT)-compatible liquefaction parameter maps for the states of Alaska, Connecticut, Idaho, Montana, Oregon, South Carolina, and Utah. The seismic source model developed by the US Geological Survey (USGS) and developed in 2014 was used to ...
  • Enhancement of the Comprehensive Risk Assessment for Transportation Projects
    Enhancement of the Comprehensive Risk Assessment for Transportation Projects
    Ashuri, Baabak ;
    Moradi, Arash
    2018-09-01 | PDF
    Early involvement of subject-matter experts is critical for better understanding the existing conditions of a project that are useful in developing appropriate risk response planning for the project. Thus, Georgia Department of Transportation (GDOT) has decided to engage subject-matter experts early on during GDOT’s plan development process (PDP) t ...
  • Waterproofing Options for Bridge Decks
    Waterproofing Options for Bridge Decks
    Wells, Danny ;
    Palle, Sudhir
    2018-09-01 | PDF
    Due to the increasing use of deicing chemicals and the subsequent intrusion of chlorides into bridge decks, it is necessary to expand the use of available protective measures, including waterproofing materials. Waterproofing options that fall into three categories; 1) membranes (liquid and sheet systems), 2) friction polymers (laminates), and 3) po ...
  • Improving Resilience of Freight Networks in West Tennessee
    Improving Resilience of Freight Networks in West Tennessee
    Golias, Mihalis M. ;
    Mishra, Sabya
    2018-09-01 | PDF
    This project developed models and tools of freight network vulnerability and resilience that capture both long/medium range pre- and post-disruption network conditions. This research used the demand/supply of the passenger and freight road network of the greater Memphis metropolitan area, an important freight hub in the nation’s transportation syst ...
  • MultiModal Distributed Simulation Combining Cars Bicyclists and Pedestrians
    Multi-Modal Distributed Simulation Combining Cars, Bicyclists, and Pedestrians
    Kearney, Joseph K. ;
    Noyce, David A.
    2018-09-01 | PDF
    A collaborative project between the University of Wisconsin-Madison and the University of Iowa was conducted to understand the feasibility of conducting driving and pedestrian simulator experiments that involve multiple agents (humans) in the simulation. As part of the collaborative project, a distributed driving simulation environment was created ...
  • Performance Improvement of High Early Strength HES Concrete for Pavement Replacement Slabs
    Performance Improvement of High Early Strength (HES) Concrete for Pavement Replacement Slabs
    Zayed, A ;
    Riding, Kyle A
    2018-09-01 | PDF
    The objectives of this study were to identify concrete mixture combinations, slab base-restraint, and placement conditions that can reduce the risk of early-age cracking potential of concrete pavement repair slabs and to provide recommendations for specifications changes. Towards satisfying the objectives, a battery of laboratory tests as well as f ...
  • Using GIS to Improve Tribal Safety Applications Trends and Implementation Dimensions
    Using GIS to Improve Tribal Safety: Applications, Trends, and Implementation Dimensions
    Horan, Thomas A. ;
    Hilton, Brian
    2018-09-01 | PDF
    Traffic safety is a significant transportation and health concern among tribal travelers. Among Native American populations, motor vehicle-related injuries are the leading cause of death for ages up to 5- 34 years old. Over the last three decades, the number of fatal crashes on Indian reservations increased dramatically, while nationally they have ...
  • An Integrated Project to EnterpriseLevel DecisionMaking Framework for Prioritization of Accelerated Bridge Construction
    An Integrated Project to Enterprise-Level Decision-Making Framework for Prioritization of Accelerated Bridge Construction 
    Alipour, Alice ;
    Gransberg, Douglas D.
    2018-09-01 | PDF
    Accelerated bridge construction (ABC) techniques are rapidly gaining acceptance as an alternative to conventional construction to reduce construction duration and minimize the impact of closures at the network level. There are different types of ABC and each technique has its limitations and speed of completion. The choice of using a specific ABC d ...
  • Tack Coat Installation Performance Guidelines
    Tack Coat Installation Performance Guidelines
    McDaniel, Rebecca S. ;
    Shah, Ayesha
    2018-09-01 | PDF
    A tack coat is a thin application of asphalt (typically emulsified) used to bond pavement layers together so that they act monolithically. Lack of bonding can lead to fatigue cracking, delamination, slippage and other distresses. This study was undertaken to explore the impacts of various tack coat materials, application rates, and other variables ...
  • Analysis of Traffic Crash Data in Kentucky 20132017
    Analysis of Traffic Crash Data in Kentucky (2013–2017)
    Green, Eric R. ;
    Agent, Kenneth R.
    2018-09-01 | PDF
    This report documents an analysis of traffic crash data in Kentucky for the years of 2013-2017. A primary objective of this study was to determine average crash statistics for Kentucky highways. Rates were calculated for various types of highways and for counties and cities. Difference criteria were used for exposure. Average and critical numbers a ...
  • Improvement of Fatal Crash Analysis and FollowUp
    Improvement of Fatal Crash Analysis and Follow-Up
    Staats, William Nicholas ;
    Pigman, Jerry G.
    2018-09-01 | PDF
    Fatalities resulting from traffic crashes in Kentucky increased from a low of 638 in 2013 to 834 in 2016 (a 31% increase), and there is not a full understanding of the underlying causes for this trend. This study analyzes fatal crashes using data from both Kentucky’s crash reports and the National Highway Traffic Safety Administration’s (NHTSA) Fat ...
  • Corrosion Tolerant PreStressed CFRP Fatigue Retrofits for Improved Waterway Lock Reliability
    Corrosion Tolerant Pre-Stressed CFRP Fatigue Retrofits for Improved Waterway Lock Reliability
    Lozano, Christine ;
    Langston, Maggie
    2018-09-01 | PDF
    Lock gates are an important part of the transportation infrastructure within the United States (US), having many economic, safety, and environmental benefits over rail and highway transportation systems. Unfortunately, many existing lock gates throughout the US have reached or exceeded their initial design life and require frequent repairs to remai ...
  • Planning the Next Generation of Seal Coat Equipment Guidelines and Implementation
    Planning the Next Generation of Seal Coat Equipment: Guidelines and Implementation
    Goehl, Darlene ;
    Gurganus, Charles
    2018-09-01 | PDF
    Using the results from prior tasks, researchers have developed guidelines for documenting pavement condition changes, application rate adjustments, and designing the next generation of spray bar equipment. For this product, researchers developed guidelines for documenting pavement condition, which included procedures and recommended equipment for d ...
  • A Framework for Automated Driving System Testable Cases and Scenarios
    A Framework for Automated Driving System Testable Cases and Scenarios
    Thorn, Eric ;
    Kimmel, Shawn C.
    2018-09-01 | PDF
    This report describes a framework for establishing sample preliminary tests for Automated Driving Systems. The focus is on light duty vehicles exhibiting higher levels of automation, where the system is required to perform the full dynamic driving task, including lateral and longitudinal control, as well as object and event detection and response.
  • Interception Capacity of Conventional Depressed Curb Inlets and Inlets with Channel Extension
    Interception Capacity of Conventional Depressed Curb Inlets and Inlets with Channel Extension
    Hodges, Ben R ;
    Barrett, Michael E.
    2018-09-01 | PDF
    This report presents the results of a project investigating the performance of the TxDOT PCO curb inlet for effects of flush supports and internal hydraulic controls. PCO inlets use flush supports for the top slab of inlets longer than 5 ft, which are thought to reduce the interception capacity of curb inlets by as much as 50%. PCO inlets longer th ...
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