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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 6581 - 6600 of 36104 results
  • Improving Fracture Resistance Measurements in Asphalt Binder Specifications with Verification on Asphalt Mixture Cracking Performance Project Summary
    Improving Fracture Resistance Measurements in Asphalt Binder Specifications with Verification on Asphalt Mixture Cracking Performance [Project Summary]
    Karki, Pravat
    2018-08-31 | PDF
    The current performance-grade (PG) specification for asphalt binders was developed 25 years ago. Over the years, many changes have occurred, including crude oil sources, improved refinery technologies to extract more saturates from crude oil before producing asphalt binders, new additives (such as re-refined engine oil bottoms [REOB], polyphosphori ...
  • Developing Pavement SafetyBased Guidelines for Improving Horizontal Curve Safety Project Summary
    Developing Pavement Safety-Based Guidelines for Improving Horizontal Curve Safety [Project Summary]
    Pratt, Michael P. ;
    Geedipally, Srinivas
    2018-08-31 | PDF
    Horizontal curves are an essential part of the rural highway system, yet they experience a disproportionate percentage of the state’s crashes, particularly run-off-road and wet-weather crashes. It is desirable to implement safety countermeasures to reduce these crashes, but the presence of large numbers of curves on the system makes it essential to ...
  • Effectiveness of Bicycle Signals for Improving Safety and Multimodal Mobility at Urban Intersections
    Effectiveness of Bicycle Signals for Improving Safety and Multimodal Mobility at Urban Intersections
    Oh, Jun-Seok ;
    Kwigizile, Valerian
    2018-08-31 | PDF
    With the dramatic increase of non-motorized transportation users, more people are concerned about the non-motorized traffic safety. Unfortunately, bicyclists and pedestrians are prone to more severe injuries when involved in a crash. For bicycle crashes, failing to yield/disregarding traffic control device, and lack of non-motorized facilities were ...
  • Accelerating Innovation in Partnered Pavement Preservation Project Summary
    Accelerating Innovation in Partnered Pavement Preservation [Project Summary]
    Prozzi, Jorge A. ;
    Kouchaki, Sareh
    2018-08-31 | PDF
    Knowledge of the surface characteristics of highway pavements is essential for state departments of transportation (DOTs) to maintain a safe, comfortable, and durable highway system. A certain level of friction at the pavement surface is essential to provide safe driving conditions, particularly during wet weather.
  • A Model for Enabling Trustworthiness in V2V Networks
    A Model for Enabling Trustworthiness in V2V Networks
    Bezzo, Nicola ;
    Chan, Jian
    2018-08-31 | PDF
    V2V and V2I networks (Fig. 1) are temporary, short-duration wireless networks designed for improving the overall driving experience by exchanging a multitude of information between vehicles and fixed infrastructure. However, given the presence of malicious entities, greedy drivers, and pranksters, blindly accepting any such information received (ev ...
  • Planning the Next Generation of Seal Coat Equipment Project Summary
    Planning the Next Generation of Seal Coat Equipment: Project Summary
    Texas A&M Transportation Institute  ...
    2018-08-31 | PDF
    Seal coats are an important preventive maintenance method used throughout Texas. For more than 40 years, there has been little change in design and construction practices. With little to no changes, Texas continues to see the same types of problems, which include rock loss, flushing, and bleeding. New technologies are being developed that could pot ...
  • Methods of Rehabilitating Pavements with Moisture Damaged Asphalt Layers Project Summary
    Methods of Rehabilitating Pavements with Moisture Damaged Asphalt Layers [Project Summary]
    Sebesta, Stephen ;
    Im, Soohyok
    2018-08-31 | PDF
    Stripping is moisture damage to old hot-mix asphalt (HMA) layers that are often buried several inches down in the pavement structure. Texas has many miles of pavements with a moisture-damaged layer near the surface. The typical current permanent repair method is to mill out the stripped layer completely and replace it with new HMA. Recent developme ...
  • Comparative Analysis of Tack Coats Trackless Tack Coats Spray Paver Membranes and Underseals Project Summary
    Comparative Analysis of Tack Coats, Trackless Tack Coats, Spray Paver Membranes, and Underseals [Project Summary]
    Wilson, Bryan ;
    Banihashemrad, Amin
    2018-08-31 | PDF
    Tack coats, trackless tack coats, spray paver underseal membranes, and underseals provide varying levels of bonding and sealing performance, but these benefits have not been sufficiently quantified, and neither has the overall impact on the asphalt overlay service life.
  • 06940 Develop System to Render MechanisticEmpirical Traffic Data for Pavement Design Project Summary
    0-6940: Develop System to Render Mechanistic-Empirical Traffic Data for Pavement Design [Project Summary]
    Aldo, Aldo ;
    Djebou, Clement
    2018-08-31 | PDF
    Axle load spectra data, typically generated from permanent weigh-in-motion (WIM) stations, constitute the primary mechanistic-empirical (ME) traffic data input for accurate and optimal pavement designs. Due to limited permanent WIM stations (mostly located on interstate highways), most ME pavement designs rely on default axle load spectra or antiqu ...
  • Fracture Critical Steel Twin Tub Girder Bridges Project Summary
    Fracture Critical Steel Twin Tub Girder Bridges [Project Summary]
    Hurlebaus, Stefan ;
    Mander, John B.
    2018-08-30 | PDF
    Steel twin tub girder (STTG) bridges (Figure 1) are a popular choice for dealing with long-spanned bridges in Texas, especially when tight-radii curves are necessary. Such solutions are aesthetically pleasing. However, these bridges are deemed fracture critical; with this comes a high price of biennial inspection. Since the structural members are p ...
  • Clustering Algorithms for Transit Network Design
    Clustering Algorithms for Transit Network Design
    Lownes, Nicholas E.
    2018-08-27 | PDF
    The transit network design problem (TNDP) dates back over five decades, receiving increasing attention over the past two. Simply put, the TNDP seeks to do two things: 1) Select groups of transit stops that should form routes and 2) Establish a sequence in which those stops should be visited. Because the underlying optimization problems are combinat ...
  • CyberPhysical Applications for Freight Transportation Systems
    Cyber-Physical Applications for Freight Transportation Systems
    Baroud, Hiba ;
    Abkowitz, Mark
    2018-08-27 | PDF
    Freight transportation systems constitute key factors in the productivity, environment, and energy consumption in Tennessee, as well as beyond the state’s borders. To achieve more efficient, safe, secure and sustainable transportation, the freight transportation industry is relying heavily on the use of cyber-physical (CP) applications. This involv ...
  • Enhancing the Fundamental Knowledge and Use of Asphalt Emulsions Using Systematic Scientific and Engineering Approaches Final Report August 2018
    Enhancing the Fundamental Knowledge and Use of Asphalt Emulsions Using Systematic Scientific and Engineering Approaches: Final Report August 2018
    Buss, Ashley ;
    Pinto, Ingryd
    2018-08-27 | PDF
    Due to their lower application temperature, lower energy consumption, and lower viscosity, asphalt emulsions are gaining popularity in the United States and worldwide. About 3 million tons of asphalt emulsion are produced in the US, which accounts for 5% to 10% of the total asphalt consumption. However, there is still a lack of understanding of the ...
  • Illinois Highway Materials Sustainability Efforts of 2017
    Illinois Highway Materials Sustainability Efforts of 2017
    Morse, Kelly L.
    2018-08-24 | PDF
    This report provides a summary of the sustainability efforts of the Illinois Department of Transportation (IDOT) in recycling reclaimed materials in highway construction during calendar year 2016. This report meets the requirements of Illinois Public Act097-0314 by documenting IDOT’s efforts to reduce the carbon footprint and achieve cost savings t ...
  • Implementation of the HMA Shear Test for Routine MixDesign and Screening Workshop Training Materials PowerPoint Presentation
    Implementation of the HMA Shear Test for Routine Mix-Design and Screening Workshop Training Materials [PowerPoint Presentation]
    Walubita, Lubinda F. ;
    Faruk, Abu N.M.
    2018-08-22 | PDF
    Implementation of the HMA shear test for routine mix-design and screening PowerPoint presentation.
  • Initial Characterization of GeopolymerBased UHPC Material Properties Final Report August 2018
    Initial Characterization of Geopolymer-Based UHPC Material Properties: Final Report August 2018
    Shen, Jay ;
    Lu, Ping
    2018-08-20 | PDF
    Ultra-high-performance concrete (UHPC) has great potential as a structural material for bridge engineering due to its excellent strength, ductility, and durability. However, the high Portland cement content required by conventional UHPC poses a major obstacle to widespread practical application because of its high cost and CO2 emissions. Introducin ...
  • Exploring the Spatial Dependence and Selection Bias of Double Parking Citations Data Transportation Research Record
    Exploring the Spatial Dependence and Selection Bias of Double Parking Citations Data. Transportation Research Record
    Gao, Jingqin ;
    Xie, Kun
    2018-08-18 | PDF
    Parking violation citations, often used to identify factors contributing to parking violation behavior, offer one of the most valuable datasets for traffic operation research. However, little has been done to examine their spatial dependence caused by location-specific differences in features such as traffic, land use, etc., and potential selection ...
  • Advanced Camera Lowering Device for ITS Maintenance
    Advanced Camera Lowering Device for ITS Maintenance
    Bennett, Duane ;
    Lasky, Ty A.
    2018-08-17 | PDF
    The California Department of Transportation (Caltrans), in an effort to satisfy mandated Intelligent Transportation System (ITS) performance goals and consistency with MAP-21 performance management targets, is deploying an increasing number of Closed-Circuit TV (CCTV) cameras to monitor traffic and conditions on California’s roadways. These CCTV ca ...
  • The Politics of Transport Policy in the Greater Copenhagen Region Part 2
    The Politics of Transport Policy in the Greater Copenhagen Region, Part 2
    Mayne, Quinton
    2018-08-16 | PDF
    This project has aimed to shed new light on the factors that have influenced the development of mass transit infrastructure in the Greater Copenhagen Region (GCR) over the past 70 years. In particular, the project has focused on examining the role that political forces and conditions have played in shaping the timing and types of transportation inv ...
  • Initial Characterization of GeopolymerBased UHPC Material Properties Tech Transfer Summary
    Initial Characterization of Geopolymer-Based UHPC Material Properties: Tech Transfer Summary
    Shen, Jay
    ORCID ICON IMG
    2018-08-15 | PDF
    Ultra-high-performance concrete (UHPC) has attracted much interest in the bridge engineering community due to its strength, ductility, and durability, but its high cement content has made it expensive and less environmentally friendly (due to the CO2 emission resulting from cement manufacture. The objective of this innovative pilot research project ...
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