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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 6341 - 6360 of 36958 results
  • Improved Asset Management of Reinforced Concrete Bridge Decks With HighResolution Imaging Methods Research Spotlight
    Improved Asset Management of Reinforced Concrete Bridge Decks With High-Resolution Imaging Methods [Research Spotlight]
    Dobson, Richard J.
    2019-04-01 | PDF
    Concrete bridge decks are routinely inspected as a requirement of the National Bridge Inspection Standards. This is typically a visual inspection, with deficiencies recorded from the shoulder of the roadway, outside of traffic flow. A new 3-D optical bridge evaluation system (3DOBS) allows inspectors to capture more detailed information about the c ...
  • Guidelines on Design and Construction of High Performance Thin HMA Overlays
    Guidelines on Design and Construction of High Performance Thin HMA Overlays
    Estakhri, Cindy K. ;
    Blackmore, Tommy
    2019-04-01 | PDF
    This Implementation Product is composed of slides from a PowerPoint Presentation on thin surface mixes.
  • The Impact of Snowfall on Airport Operations and Delays
    The Impact of Snowfall on Airport Operations and Delays
    Lee, Jukwan ;
    Yan, Jia
    2019-04-01 | PDF
    Flight delays or cancelations due to snowfall are a costly inconvenience, not only to airports but also to airlines, passengers and society as a whole. However, no quantitative research has ever been done to provide an analytical explanation about the issue. Though being a reliable alternative to melt snow on the runway and mitigate flight delays, ...
  • An Analysis of Decision Boundaries for LeftTurn Treatments
    An Analysis of Decision Boundaries for Left-Turn Treatments
    Schultz, Grant G. ;
    Adamson, Michael L
    2019-04-01 | PDF
    The purpose of this project is to evaluate the safety and operational differences between three left-turn treatments: permitted, protected, and protected-permitted left-turn phasing. Permitted phasing allows vehicles to turn left after yielding to any opposing vehicles; protected phasing provides an exclusive phase for vehicles to turn left that do ...
  • Degradation Mechanisms and Service Life Estimation for Fiber Reinforced Polymer FRP Concrete Reinforcements
    Degradation Mechanisms and Service Life Estimation for Fiber Reinforced Polymer (FRP) Concrete Reinforcements
    Elsafty, Adel ;
    Benmokrane, Brahim
    2019-04-01 | PDF
    Fiber-reinforced-polymer (FRP) reinforcement, such as glass and carbon, have emerged as an acceptable construction material for both new constructions as well as for the rehabilitation and strengthening of existing structures. The proven track records of superior performance of FRP materials in terms of strength, durability, resistance to corrosion ...
  • LongTerm Degradation and Strength Characteristics of Wisconsin Virgin Base Aggregates under HMA Pavements Research Brief
    Long-Term Degradation and Strength Characteristics of Wisconsin Virgin Base Aggregates under HMA Pavements [Research Brief]
    Titi, Hani H.
    2019-04-01 | PDF
    Aggregate base course layers serve an important role in hot mix asphalt (HMA) pavement stability and performance by providing structural support to the surface layer and by dissipating traffic loads and transferring them to the underlying pavement layers or subgrade. Poor base layer performance due to long-term degradation can cause serious pavemen ...
  • Implementation of a V2I Highway Safety System and Connected Vehicle Testbed
    Implementation of a V2I Highway Safety System and Connected Vehicle Testbed
    Hourdos, John ;
    Parikh, Gordon
    2019-04-01 | PDF
    To better prepare for the Connected Vehicle (CV) roadway, RSI has established a CV testbed along a highly crashed section of I-94, building on the Minnesota Traffic Observatory’s existing field lab infrastructure. This real-world testbed was designed to implement and evaluate the next generation of vehicle-based freeway safety applications. The pri ...
  • Development and Demonstration of Merge Assist System using Connected Vehicle Technology
    Development and Demonstration of Merge Assist System using Connected Vehicle Technology
    Hussain, Shah ;
    Hayee, M. Imran
    2019-04-01 | PDF
    One potential area to improve driver safety and traffic mobility is around merge points of two roadways, e.g., at a typical freeway entrance ramp. Due to poor visibility because of weather or complex road infrastructure, on many such entrance ramps, it may become difficult for the driver on the merging/entrance ramp to clearly see the vehicles trav ...
  • Every Day Counts An Innovation Partnership With States EDC4 Final Report April 2019
    Every Day Counts: An Innovation Partnership With States - EDC-4 Final Report, April 2019
    United States. Federal Highway Administration
    2019-04-01 | PDF
    Every Day Counts (EDC) is a Federal Highway Administration program to advance a culture of innovation in the transportation community in partnership with public and private stakeholders. FHWA coordinates rapid deployment of proven strategies and technologies to shorten the project delivery process, enhance roadway safety, reduce congestion, and imp ...
  • Preferential Vaporization Impacts on Lean BlowOut of Liquid Fueled Combustors
    Preferential Vaporization Impacts on Lean Blow-Out of Liquid Fueled Combustors
    Won, Sang Hee ;
    Rock, Nicholas
    2019-04-01 | PDF
    Recent experimental works have shown that the global equivalence ratio defining lean blowout (LBO) in model gas turbine combustors correlates with the derived cetane number (DCN) of the tested fuel, which represents the chemical reactivity potential of the fuel, but additional physical and kinetic parameters of the fuel also have influence. The cur ...
  • Wisconsin Department of Transportation 2018 Research Development Technology Peer Exchange
    Wisconsin Department of Transportation 2018 Research, Development & Technology Peer Exchange
    Wisconsin. Dept. of Transportation. Library and Research Unit
    2019-04-01 | PDF
    The Wisconsin Department of Transportation (WisDOT) Research Program hosted a peer exchange on September 19-21, 2018, in Madison, Wisconsin. The peer exchange examined best practices for managing research as an asset; aligning research and innovation; and documenting and communicating the successes of research and innovation. The first two topics o ...
  • Evaluation of Structural Cracking in Concrete Final Report
    Evaluation of Structural Cracking in Concrete: Final Report
    Zaborac, Jarrod ;
    Athanasiou, Apostolos
    2019-04-01 | PDF
    Current methods used to assess structural cracking in concrete bridge infrastructure consist of various rating criteria in the form of pre-established concrete crack width and crack density limits. While cracking data obtained from routine inspections can aid in identifying bridge degradation, typical inspection techniques provide limited insight r ...
  • ASTM C157 Standard Audit for ThirdParty Shrinkage Testing Laboratories to Improve the Reliability of Results for Concrete Mixes
    ASTM C-157 Standard Audit for Third-Party Shrinkage Testing Laboratories to Improve the Reliability of Results for Concrete Mixes
    Rishi, Avinash ;
    Romero, Pedro
    2019-04-01 | PDF
    Shrinkage of concrete is one of the reasons of concrete cracking in bridge decks. To minimize such cracks, concrete mixes with minimal shrinkage potential is used. This shrinkage potential was evaluated by third party shrinkage testing laboratories as per ASTM C-157 standard. However, significantly different results were obtained from different lab ...
  • Performance Evaluation of Glass Fiber Reinforced Polymer GFRP Reinforcing Bars Embedded in Concrete Under Aggressive Environments Summary
    Performance Evaluation of Glass Fiber Reinforced Polymer (GFRP) Reinforcing Bars Embedded in Concrete Under Aggressive Environments [Summary]
    Kampmann, Raphael ;
    Roddenberry, Michelle
    2019-04-01 | PDF
    Many concrete structures in Florida are reinforced with steel bars. Combining concrete and steel produces extremely strong structures that would not be possible with concrete alone. However, in Florida’s humid environments, moisture or salt can penetrate the concrete over a number of years and cause the steel to corrode. This can cause the concrete ...
  • State Highway 9 Wildlife Crossings Monitoring Year 3 Progress Report December 2015 Through April 2018
    State Highway 9 Wildlife Crossings Monitoring - Year 3 Progress Report [December 2015 Through April 2018]
    Kintsch, Julia ;
    Cramer, Patricia
    2019-04-01 | PDF
    This research study evaluates the effectiveness of the mitigation infrastructure through the use of motion activated cameras and analyses of WVC carcass and accident data. The study maintained a total of 62 motion-triggered cameras at 40 locations in Year 3 to record animal movements and responses to the mitigation. Cameras were placed at crossing ...
  • Sustainable Design of Concrete Bus Pads to Improve Mobility in Baltimore City
    Sustainable Design of Concrete Bus Pads to Improve Mobility in Baltimore City
    Aslan, Kadir ;
    Shokouhian, Mehdi
    2019-03-31 | PDF
    Public transit, particularly buses in Baltimore City, plays a vital role in sustainable transportation in the United States as well as providing mobility to those without cars. Bus pads are usually constructed in the street, adjacent to a bus zone, to accommodate the weight of a bus. Bus pads are highly durable areas of the roadway surface at bus s ...
  • Evaluating the Particle Size Distribution and Gross Solids Contribution of Stormwater Runoff From Ohios Roads
    Evaluating the Particle Size Distribution and Gross Solids Contribution of Stormwater Runoff From Ohio’s Roads
    Winston, Ryan J ;
    Witter, Jonathan D
    2019-03-31 | PDF
    In order to properly size stormwater treatment systems, or best management practice (BMPs), the sediment particle size distribution (PSD) is needed to quantify the required hydraulic retention time for particle settling or to understand what other treatment processes, such as filtration, might be needed to meet a target sediment removal goal. Gross ...
  • Implementation of a CommunityBased Public Health Buddy Program for TransportationDisadvantaged Older Adults
    Implementation of a Community-Based Public Health Buddy Program for Transportation-Disadvantaged Older Adults
    Jang, Siwon ;
    Wright, Savana
    2019-03-31 | PDF
    Given that there is a well-established link between driving cessation among older adults and declines in physical, social and cognitive function, the mobility of an aging U.S. population is both a public health concern and transportation planning dilemma. In response, this study sought to determine whether a community-based “buddy” program that pai ...
  • Sizing Hydraulic Structures in Cold Regions to Balance Fish Passage Stream Function and Operation and Maintenance Cost
    Sizing Hydraulic Structures in Cold Regions to Balance Fish Passage, Stream Function, and Operation and Maintenance Cost
    Blank, Matthew ;
    Dockery, David
    2019-03-31 | PDF
    The purpose of this research was to evaluate how characteristics of hydraulic structures, such as slope or size, used at crossings over waterways relate to operation and maintenance (O&M) effort, fish passage, and stream function. Data on O&M concerns, fish passage concerns, and crossing characteristics were collected from 45 road-stream crossings ...
  • Performance Evaluation of Cable Barriers on a 61 Sloped Median under MASH TL3 Conditions
    Performance Evaluation of Cable Barriers on a 6:1 Sloped Median under MASH TL-3 Conditions
    Fang, Howie ;
    Palta, Emre
    2019-03-31 | PDF
    In this study, non-linear finite element simulations were conducted to evaluate the performance of the current North Carolina Department of Transportation (NCDOT) cable median barrier (CMB) and two retrofit CMB designs (named “Sixth Design Retrofit” and “Four-cable Design Retrofit”) placed on a 6H:1V sloped median. The aim of this research was to i ...
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