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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 7461 - 7480 of 36114 results
  • Correlation Analysis of Freeway Traffic Status and Crashes with Nevada Data
    Correlation Analysis of Freeway Traffic Status and Crashes with Nevada Data.
    Xu, Hao ;
    Wu, Jianqing
    2017-11-11 | PDF
    This project is to study the correlation between freeway traffic status and crash risks with the historical freeway ITS data and related crash data in Nevada. With the comprehensive review of previous research results, the Center for Advanced Transportation Education and Research (CATER) at the University of Nevada, Reno (UNR) analyzed the interact ...
  • Removal Effectiveness of Comingling Offsite Flows with FDOT RightofWay Stormwater Summary
    Removal Effectiveness of Co-mingling Off-site Flows with FDOT Right-of-Way Stormwater : [Summary].
    Chang, Ni-Bin
    2017-11-10 | PDF
    Because designers have many options in designing runoff systems, the researchers studied and simulated many scenarios. They considered five Florida regions, each with a characteristic rainfall pattern. For each location, assuming rainfall of one inch per hour, 75 simulations were run in order to consider the full range of runoff volumes, delay time ...
  • Low Vertical Clearance Truss Bridges Risk Assessment and Retrofit Mitigation Study
    Low Vertical Clearance Truss Bridges : Risk Assessment and Retrofit Mitigation Study
    Swett, Geoffrey D. ;
    Bedi, Gary
    2017-11-10 | PDF
    The Washington State Department of Transportation (WSDOT) has over 60 steel truss bridges in its inventory with vertical clearances less than the minimum 16’-6” required for new bridges. This study evaluates the risks of oversized vehicle impacts to existing truss bridges with low vertical clearances. The Skagit River Bridge SR5/712 was hit by an o ...
  • Worldwide Life Cycle Analysis LCA of Greenhouse Gas GHG Emissions from Petroleum Jet Fuel
    Worldwide Life Cycle Analysis (LCA) of Greenhouse Gas (GHG) Emissions from Petroleum Jet Fuel
    Barrett, Steven R.H. ;
    Malina, Robert
    2017-11-09 | PDF
    The main objective of this project was to calculate greenhouse gas emissions estimates for petroleum jet fuels for the recent past and for future scenarios in the coming decades. Results were reported globally and broken out by world regions, and the impact of changes in future demand for certain petroleum products and of changes in crude propertie ...
  • A Driving Simulator Evaluation of Driver Distraction and Traffic Control Device Comprehension for AtGrade Railroad Crossings
    A Driving Simulator Evaluation of Driver Distraction and Traffic Control Device Comprehension for At-Grade Railroad Crossings
    Knodler, Michael A. ;
    Fisher, Donald L.
    2017-11-08 | PDF
    U.S. Federal statistics show a downward trend in the number of incidents at railway-highway at-grade crossings (herein referred to as grade crossings), yet the number of fatalities at these crossings remains appalling. A total of 2,075 railroad-highway grade crossing vehicle-train collisions occurred in 2015, resulting in 244 deaths and more than 1 ...
  • Truck Choice Modeling Understanding Californias Transition to ZeroEmission Vehicle Trucks Taking into Account Truck Technologies Costs and Fleet Decision Behavior
    Truck Choice Modeling: Understanding California's Transition to Zero-Emission Vehicle Trucks Taking into Account Truck Technologies, Costs, and Fleet Decision Behavior
    Miller, Marshall ;
    Wang, Qian
    2017-11-01 | PDF
    This report presents the results of a project to develop a truck vehicle/fuel decision choice model for California and to use that model to make initial projections of truck sales by technology out to 2050. The report also describes the linkage of this model to a broader scenarios model of road transportation energy use in California to 2050. A sep ...
  • Forensic Study of Early Failures with Unbonded Concrete Overlays
    Forensic Study of Early Failures with Unbonded Concrete Overlays
    Sargand, Shad M. ;
    Green, Roger
    2017-11-01 | PDF
    A forensic investigation was conducted to identify failure mechanisms responsible for early failures of unbonded concrete overlays on selected projects in Ohio, including I-70 in Madison County, I-77 in Washington and Noble Counties, and I-90 in Lake County, plus a project in US Route 30 in Ashland County that was one of the better performing joint ...
  • How Does Texas Law Change the Legal Landscape for Automated Vehicles
    How Does Texas Law Change the Legal Landscape for Automated Vehicles?
    Stoeltje, Gretchen ;
    Antonio, Alexander J.
    2017-11-01 | PDF
    With the advent of automated vehicle technologies, we are entering a period of transition and uncertainty that involves harmonizing the laws that we have on the books with new issues raised by the technology. Until the 85th Texas Legislature (2017), Texas law did not recognize automated vehicles (AVs), neither for testing nor for operation on Texas ...
  • Quantification of the Impact of Roadway Conditions on Emissions
    Quantification of the Impact of Roadway Conditions on Emissions
    Chang, Carlos M. ;
    Qiao, Fengxiang
    2017-11-01 | PDF
    The scope of this project involved developing a methodology to quantify the impact of road’s condition on emissions and providing guidance to assist TxDOT in improving maintenance strategies to reduce gas emissions. The research quantified vehicle gas emissions for Carbon Dioxide (CO2), Carbon Monoxide (CO), Hydrocarbons (HC), and Nitrogen (NOx) ba ...
  • Development and Testing of Optimized Autonomous and Connected Vehicle Trajectories at Signalized Intersections
    Development and Testing of Optimized Autonomous and Connected Vehicle Trajectories at Signalized Intersections
    Elefteriadou, Lily ;
    Pourmehrab, Mahmoud
    2017-11-01 | PDF
    Significant improvements in automated and connected vehicle technologies are expected to create a revolution in how we move and move things. Automated vehicles can operate using a variety of sensors such as GPS, lidar, radar, and smart cameras, as well as terrain information, and they have the ability to communicate with infrastructure as well as s ...
  • Evaluation of Metakaolin and Slag for GDOT Concrete Specifications and Mass Concrete Provision Phase I
    Evaluation of Metakaolin and Slag for GDOT Concrete Specifications and Mass Concrete Provision - Phase I
    Geum Chorzepa, Mi ;
    Durham, Stephan A.
    2017-11-01 | PDF
    This report documents the evaluation of cement replacement with mekaolin and slag materials supplied by multiple vendors by measuring compressive strength, tensile strength, modulus of rupture, modulus of elasticity, sulfate expansion, alkali-silica reaction, rapid chloride permeability, coefficient of thermal expansion, drying shrinkage, and heat ...
  • Visually Impaired Pedestrian Safety at Roundabout Crossings
    Visually Impaired Pedestrian Safety at Roundabout Crossings
    Christofa, Eleni ;
    Ganz, Aura
    2017-11-01 | PDF
    Pedestrians are some of the most vulnerable road users. This becomes more apparentat intersections, where pedestrians are unprotected and interacting with vehicles. Whilepedestrian phases that are commonplace at most signalized intersections facilitate theirsafe movement through intersections, roundabouts by nature provide little protection topedes ...
  • Evaluation of Opportunities and Challenges of Using INRIX Data for RealTime Performance Monitoring and Historical Trend Assessment
    Evaluation of Opportunities and Challenges of Using INRIX Data for Real-Time Performance Monitoring and Historical Trend Assessment
    Sharma, Anuj ;
    Ahsani, Vesal
    2017-11-01 | PDF
    In recent years there has been a growing desire for the use of probe vehicle technology for congestion detection and general infrastructure performance assessment. Unlike costly traditional data collection by loop detectors, wide-area detection using probe-sourced traffic data is significantly different in terms of measurement technique, pricing, c ...
  • Quantifying the Impact that New Capital Projects Will Have on Roadway Snow and Ice Control Operations
    Quantifying the Impact that New Capital Projects Will Have on Roadway Snow and Ice Control Operations
    Sullivan, James ;
    Dowds, Jonathan
    2017-11-01 | PDF
    In recent years, many states have experienced heavy burdens on their snow and ice control budgets. Increases in winter/spring precipitation results in increased costs to state departments of transportation (DOTs) for winter roadway maintenance materials (salt, sand, chemicals, etc.), plow operator time, equipment maintenance and replacement budgets ...
  • Lime Kiln Dust for Treated Subgrades Final Report
    Lime Kiln Dust for Treated Subgrades : Final Report
    Kakrasul, Jamal I. ;
    Parsons, Robert L.
    2017-11-01 | PDF
    Chemical and cementitious materials are often used to modify and stabilize the subgrade soils that serve as foundations for pavements. Improvement of the subgrade provides a better working platform for construction of the layers above and improves the strength of the pavement structure. Lime, cement, and fly ash have all been successfully used for ...
    Supporting Files
  • Compliance Crash Testing of the Type 60 Median Barrier Test 140MASH3C1604
    Compliance Crash Testing of the Type 60 Median Barrier, Test 140MASH3C16-04
    Whitesel, David ;
    Jewell, John
    2017-11-01 | PDF
    The California Department of Transportation has used Type 60 Median Barrier since it passed the National Cooperative Highway Research Program (NCHRP) Report 350 safety guidelines and became a Standard Plan in 1997. It is a single-slope concrete barrier that is 36 inches high with a face sloped 9.1 degrees from vertical. The Manual for Assessing Saf ...
  • TransitOriented Development and Ports National Analysis across the United States and a Case Study of New Orleans
    Transit-Oriented Development and Ports: National Analysis across the United States and a Case Study of New Orleans
    Renne, John L.
    2017-11-01 | PDF
    The aim of this study is to examine the extent that freight and passenger transportation planning overlap within the context of transit-oriented developments (TODs) near ports. This study also includes a case study of New Orleans. Research questions included: (1) How many fixed-transit stations, including TODs, in the United States are located with ...
  • Postmortem Samples from Aviation Accident Victims Maintain TissueSpecific mRNA Expression Profiles
    Postmortem Samples from Aviation Accident Victims Maintain Tissue-Specific mRNA Expression Profiles
    Burian, Dennis ;
    Uyhelji, H. A.
    2017-11-01 | PDF
    To determine whether an aerospace medical factor such as hypoxia or sleep deprivation played a role in the cause of an aviation accident, gene expression marker panels are in development based on results from live subject studies in humans. The translation of marker panels from the discovery phase to a forensic setting requires that RNA stability a ...
  • Cost and Ecological Feasibility of Using UHPC in Highway Bridges Nevada DOT
    Cost and Ecological Feasibility of Using UHPC in Highway Bridges [Nevada DOT]
    Joe, Christopher D. ;
    Moustafa, Mohamed A.
    2017-11-01 | PDF
    There is a growing interest in expanding the use of Ultra-high performance concrete (UHPC) from bridge deck joints for accelerated bridge construction to complex architectural and advanced structural applications. The high costs currently associated with UHPC might limit its widespread use. However, the more compact cross-sections, higher strength, ...
  • Decision Support Tool for Nighttime Construction and Air Quality Users Guide
    Decision Support Tool for Nighttime Construction and Air Quality - User’s Guide
    Ramani, Tara ;
    Farzaneh, Reza
    2017-11-01 | PDF
    The Texas Department of Transportation (TxDOT) Research Project 0-6864 Investigate the Air Quality Benefits of Nighttime Construction in Non-attainment Counties investigated the potential air quality benefits of shifting construction/maintenance activities to the nighttime. A decision-support framework in the form of a spreadsheet tool was develope ...
    Supporting Files
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