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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 6161 - 6180 of 36049 results
  • QUEWZ Work Zone Software Literature Search and Methodology Review
    QUEWZ Work Zone Software: Literature Search and Methodology Review
    Ishimaru, John ;
    Hallenbeck, Mark
    2019-01-01 | PDF
    This report documents the results of a literature review and methodological analysis into the design and technical basis of the QUEWZ work zone road user cost estimation software tool. The report documents how key formulas/algorithms within the QUEWZ software were derived, describes ways that QUEWZ could be updated, and summarizes the literature re ...
  • Structures Research On Call Services Task 1 Final Report Assessment of the Load Rating of Bridges with a Load Rating Factor Greater Than 135 to Meet Specialized Hauling Vehicle Requirements
    Structures Research On Call Services: Task 1 Final Report - Assessment of the Load Rating of Bridges with a Load Rating Factor Greater Than 1.35 to Meet Specialized Hauling Vehicle Requirements
    Nims, Douglas K. ;
    Steinberg, Eric P
    2019-01-01 | PDF
    The statistical study considered real bridges in Ohio with a rating factor (RF) ≥ 1.35 whose section properties may vary along the length of the bridge. A sample of these bridge was examined. The sample included a minimum of thirty bridges of the each of the six common types studied. No actual bridge was found to have an SHV RF < 1.00. To extend th ...
  • Best Practices for Placing Concrete Overlays on Prestressed Slab Bridges
    Best Practices for Placing Concrete Overlays on Prestressed Slab Bridges
    Amde, A M ;
    Sharma, S.
    2019-01-01 | PDF
    The objective of this research was to identify alternatives to the Maryland Department of Transportation State Highway Administration’s (MDOT SHA's) procedure of placing cast-in-place concrete overlays on prestressed bridge decks. The current practice involves the application of a cement-sand slurry mix over the bridge deck prior to placement of ov ...
  • A Multivariate Spatial Approach to Model Crash Counts by Injury Severity
    A Multivariate Spatial Approach to Model Crash Counts by Injury Severity
    Xie, Kun ;
    Yang, Hong
    2019-01-01 | PDF
    Conventional safety models rely on the assumption of independence of crash data, which is frequently violated. This study develops a novel multivariate conditional autoregressive (MVCAR) model to account for the spatial autocorrelation of neighboring sites and the inherent correlation across different crash types. Manhattan, which is the most dense ...
  • Deterioration Modelling of Bridges on BrM 523
    Deterioration Modelling of Bridges on BrM 5.2.3
    Palle, Sudhir ;
    Hopwood II, Theodore
    2019-01-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) initiated the study KYSPR 17-532, “Deterioration Modelling of Bridges on BrM 5.2.3,” so it could receive assistance identifying and employing bridge deterioration and cost forecast modeling for its bridge maintenance program. The Kentucky Transportation Center (KTC) was to help coordinate KYTC in adapting ...
  • Application of Superpave Gyratory Compactors for Flexible Base and Subgrade
    Application of Superpave Gyratory Compactors for Flexible Base and Subgrade
    Lee, Sang Ick ;
    Sebesta, Stephen
    2019-01-01 | PDF
    The impact hammer compaction has historically been used to develop moisture-density curves and fabricate specimens for strength testing for flexible base and subgrade materials. However, the precision of compressive strength results by the impact hammer compaction remains a concern that can result in conflicting test results on whether a material m ...
  • Safety Analysis and Crash Modification Factors of an Adaptive Signal Control Technology along a Corridor
    Safety Analysis and Crash Modification Factors of an Adaptive Signal Control Technology along a Corridor
    Osorio, Jesus J. ;
    Benekohal, Rahim F.
    2019-01-01 | PDF
    The main objective of this study is to determine the safety effectiveness of the adaptive signal control technology (ASCT) SynchroGreen using an observational before and after study applying the Empirical Bayes (EB) method. Both national (HSM) and state specific (Illinois) safety performance functions (SPF) were selected and calibrated for the loca ...
  • Investigation of Cracking Resistance of Asphalt Mixtures and Binders
    Investigation of Cracking Resistance of Asphalt Mixtures and Binders
    Marasteanu, Mihai ;
    Turos, Mugurel
    2019-01-01 | PDF
    In this study, the viability of using three test methods for asphalt mixtures and one test method for asphalt binders are investigated. These test methods are: Bending Beam Rheometer (BBR) for creep and strength of asphalt mixtures; low temperature Semi Circular Bend (SCB) test for fracture energy of asphalt mixtures; Dynamic Modulus (E*) test of a ...
  • Connected EcoDriving Technologies for Adaptive Traffic Signal Control
    Connected Eco-Driving Technologies for Adaptive Traffic Signal Control
    Xin, Wuping ;
    Moonam, Hasan
    2019-01-01 | PDF
    Signal phase and timing (SPaT) data enable eco-driving for vehicles both approaching and departing signalized intersections. The data are often presumed to be accurate as well as obtained from the conventional fixed-time signals that operate deterministically. In practice, however, it is common to have actuated or adaptive signals in which the sign ...
  • Quick Response Quantification of Research Benefits
    Quick Response: Quantification of Research Benefits
    Gross, Frank ;
    Le, Thanh
    2019-01-01 | PDF
    Quantifying research benefits and evaluating economic effectiveness of research projects are becoming increasingly important to agencies. The six States comprising the New England Transportation Consortium (NETC) were interested in developing a consistent way to evaluate and quantify the monetary benefits from research projects. This report documen ...
  • Developing a Surface Drainage Rating for Inclusion in TxDOTs Asset Management System Technical Report
    Developing a Surface Drainage Rating for Inclusion in TxDOT’s Asset Management System: Technical Report
    Gurganus, Charles ;
    Scullion, Tom
    2019-01-01 | PDF
    This project develops a surface drainage rating for inclusion in the Texas Department of Transportation’s asset management system. The surface drainage rating includes paved surface attributes and roadside attributes. During development of the rating, special care was taken to account for safety aspects inherent to drainage features. A key element ...
  • Experimental Study of the Load Response of Large Diameter ClosedEnded and OpenEnded Pipe Piles Installed in Alluvial Soil
    Experimental Study of the Load Response of Large Diameter Closed-Ended and Open-Ended Pipe Piles Installed in Alluvial Soil
    Han, Fei ;
    Ganju, Eshan
    2019-01-01 | PDF
    A seven-span concrete bridge was constructed over the Wabash River in Lafayette, Indiana. The bridge, which has a total length of 305 m (1,000 ft) and typical spans of 46 m (152 ft), consists of six hammerhead bridge piers in the center and two end bents supported on open-ended and closed-ended pipe piles, respectively. According to the structural ...
  • Corridor Capacity Manual DelDOT
    Corridor Capacity Manual [DelDOT]
    Delaware. Dept. of Transportation
    2019-01-01 | PDF
    This guide to Delaware's Corridor Capacity Preservation Program (CCPP) contains strategies and information that advance policies adopted by the Cabinet Committee on State Planning Issues. The guide outlines how the state seeks to preserve the roads we already have, improve safety, and focus development toward areas where infrastructure already exis ...
  • Quantifying the Value of Multimodal Freight Investments
    Quantifying the Value of Multimodal Freight Investments
    Srivastava, Anupam ;
    Perry, Ernest
    2019-01-01 | PDF
    This research attempts to identify best practices available to practitioners for evaluating and comparing benefits derived from freight investments across modal projects. The study looks at various available frameworks for evaluating the economic impact and viability of projects, various tools and products that automate the analysis, and data sourc ...
  • Corrosion Propagation of Carbon Steel Rebars in High Performance Concrete Summary
    Corrosion Propagation of Carbon Steel Rebars in High Performance Concrete [Summary]
    Presuel-Moreno, Francisco
    2019-01-01 | PDF
    Florida Atlantic University researchers examined steel-reinforced concrete samples exposed to a variety of conditions in the field and in the laboratory to develop a better understanding of corrosion propagation in carbon steel rebar embedded in high performance concrete.
  • Performance Characteristics of Modern Recycled Asphalt Mixes in Missouri Including Ground Tire Rubber Recycled Roofing Shingles and Rejuvenators
    Performance Characteristics of Modern Recycled Asphalt Mixes in Missouri, Including Ground Tire Rubber, Recycled Roofing Shingles, and Rejuvenators
    Buttlar, William G. ;
    Meister, James F.
    2019-01-01 | PDF
    A comprehensive lab and field investigation was carried out to evaluate the performance of recycled asphalt mixtures in Missouri by researchers at the University of Missouri-Columbia, in collaboration with the Missouri Department of Transportation and the Midwest Transportation Center. Sixteen field sections were evaluated, including a number of se ...
    Supporting Files
  • Best Practices for Implementing FDR for Pavements in the Energy Sector
    Best Practices for Implementing FDR for Pavements in the Energy Sector
    Sebesta, Stephen ;
    Taylor, Ross
    2019-01-01 | PDF
    Full-depth reclamation (FDR) can offer an economical and rapid strategy for pavement renewal. With pavement damage coinciding with energy sector development, departments of transportation need rapid and economical methods to strengthen and renew these impacted pavements. This project focused on implementing FDR for pavements in the energy sector. A ...
  • Assessment of Bridges Subjected to Vehicular Collision
    Assessment of Bridges Subjected to Vehicular Collision
    Wang, Yao ;
    Thrall, Ashley P
    2019-01-01 | PDF
    Vehicles often collide with bridges. However, there are no available guidelines for bridge inspectors to assess damage and to make repair decisions. This project addresses this gap by investigating the behavior of steel girder bridges subjected to vehicular collision through (1) performing non-destructive field testing, (2) developing validated num ...
  • Cooperative Adaptive Cruise Control for Connected Autonomous Vehicles by Factoring CommunicationRelated Constraints
    Cooperative Adaptive Cruise Control for Connected Autonomous Vehicles by Factoring Communication-Related Constraints
    Wang, Chaojie ;
    Gong, Siyuan
    2019-01-01 | PDF
    This study proposes a novel CACC strategy, CACC-OIFT, to explicitly factor IFT dynamics and to leverage it to enhance the platoon performance in an unreliable V2V communication context for a pure CAV platoon.
  • National RTAPs Resource Share Curation Project Development of a Collection Tailored Toward Rural and Tribal Transit Technical Assistance
    National RTAP's Resource Share Curation Project: Development of a Collection Tailored Toward Rural and Tribal Transit Technical Assistance
    Marcus, Cara ;
    Phillips, Robin
    2019-01-01 | PDF
    Research shows that the organizational mission, priorities and user are the most important factors of collection development for transportation libraries. The curation project was undertaken as an initiative to align the collection with our Library Mission: To provide access to free, high quality technical assistance and training materials dedicate ...
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