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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 6481 - 6500 of 36958 results
  • Evaluation and Analysis of Postdisaster Reentry in Megaregions A Pilot Study
    Evaluation and Analysis of Post-disaster Re-entry in Megaregions: A Pilot Study
    Wolshon, Brian ;
    Mitchell, Brant
    2019-02-01 | PDF
    This study attempts to address the deficit of the limited research that has been conducted on re-entry. Through a comprehensive literature review there were a total of six publications that addressed re-entry with nearly all of the research focused on the individual evacuee and not the decision-making process on initiating re-entry. This study also ...
  • Texas MechanisticEmpirical Flexible Pavement Design and Analysis System TxME Student Handbook
    Texas Mechanistic-Empirical Flexible Pavement Design and Analysis System (TxME) Student Handbook
    Hu, Sheng ;
    Zhou, Fujie
    2019-02-01 | PDF
    This student handbook is to provide basic and advanced training about the use of the Texas Mechanistic-Empirical Flexible Pavement Design and Analysis System (TxME). It can be used as a TxME user manual and a standalone resource of Mechanistic-Empirical (M-E) flexible pavement design training material. The purposes of the TxME training are to: (1) ...
  • Development of Alternative Bridge Superstructures for South Dakota Local Roads
    Development of Alternative Bridge Superstructures for South Dakota Local Roads
    Carnahan, Zachary ;
    Mingo, Michael
    2019-02-01 | PDF
    The South Dakota Department of Transportation (SDDOT) allows the use of precast double-tee bridges in counties because they are economical and fast in construction. Alternative durable prefabricated bridge systems are needed to provide more options to local governments. The present study was carried out to investigate the feasibility of alternative ...
  • Implementation of Texas MechanisticEmpirical Flexible Pavement Design System TxME
    Implementation of Texas Mechanistic-Empirical Flexible Pavement Design System (TxME)
    Hu, Sheng ;
    Rahman, Asif
    2019-02-01 | PDF
    The Texas Mechanistic-Empirical flexible pavement design system (TxME) allows Texas pavement designers to take full advantage of new or premium materials, with a full consideration of the influential factors including pavement structure, traffic volume, and environmental condition. To further enhance and implement the software, extensive lab testin ...
  • Investigating the Need for Drainage Layers in Flexible Pavements
    Investigating the Need for Drainage Layers in Flexible Pavements
    Ghavami, Masoud Seyed Mohammad ;
    Hosseini, Maryam Sadat
    2019-02-01 | PDF
    Moisture can significantly affect flexible pavement performance. As such, it is crucial to remove moisture as quickly as possible from the pavements, mainly to avoid allowing moisture into the pavement subgrade. In the 1990s the Indiana Department of Transportation (INDOT) adopted an asphalt pavement drainage system consisting of an open-graded asp ...
  • Development of Alternative Bridge Superstructures for South Dakota Local Roads Research Brief
    Development of Alternative Bridge Superstructures for South Dakota Local Roads {Research Brief]
    Wehbe, Nadim I. ;
    Tazarv, Mostafa
    2019-02-01 | PDF
    Double-tee bridges may need replacement after only 40 years of service due to rapid deterioration. With only one supplier of double-tee girders in South Dakota, new prefabricated bridge systems are needed to provide local governments more options when designing new bridges or replacing deteriorated ones.
  • AlkaliSilica Reactivity in the State of Montana
    Alkali-Silica Reactivity in the State of Montana
    Berry, Michael
    2019-02-01 | PDF
    Concrete can be susceptible to expansive reactions between alkalis in the Portland cement and the silicas in the aggregates, which can ultimately reduce the lifespan of the concrete resulting in costly repairs or even replacement. The primary objective of this project is to evaluate the history of and potential for deleterious alkali-silica reactiv ...
    Supporting Files
  • Bismarck Mandan MPO 2015 Travel Demand Model Update
    Bismarck Mandan MPO 2015 Travel Demand Model Update
    Motuba, Diomo ;
    Khan, Asif
    2019-02-01 | PDF
    The Bismarck Mandan (The B-M MPO) Travel Demand Model (TDM) is updated every five years to reflect new ground truths/data and the advancements in the state-of-the-art in transportation modeling techniques and methods. The current update reflects base year 2015 data. The model is a four-step TDM including trip generations, trip distributions, modal ...
  • Exploring the Modified Procurement Framework for Expediting Florida Connected Vehicle CV Deployments
    Exploring the Modified Procurement Framework for Expediting Florida Connected Vehicle (CV) Deployments
    Sando, Thobias ;
    Alluri, Priyanka
    2019-02-01 | PDF
    This study examined the current procurement framework of connected vehicle (CV) deployments in Florida to provide guidance for expediting CV projects. A brief review of the current state-of-the-practice of CV deployment at the regional, national, and international level was conducted. Ongoing and operational CV projects included in the Florida Depa ...
  • Mechanical integrity and sustainability of prestressed concrete bridge girders repaired by epoxy injection Phase III
    Mechanical integrity and sustainability of prestressed concrete bridge girders repaired by epoxy injection - Phase III
    Arson, Chloe ;
    Stewart, L.K.
    2019-02-01 | PDF
    During pre-stress transfer, the bottom portion of steel-reinforced concrete girders is subjected to an important compression induced by the relaxation of tension in the bars, which opens longitudinal cracks along the horizontal axis. Reactions at the supports induce shear stress, which sometimes translates into additional diagonal cracks at the end ...
  • Improving Railroad Grade Crossing Safety Accurate Prediction of Train Arrival Times for Emergency Response Management and Driver Decision Support
    Improving Railroad Grade Crossing Safety: Accurate Prediction of Train Arrival Times for Emergency Response Management and Driver Decision Support
    Work, Daniel B. ;
    Wang, Ren
    2019-02-01 | PDF
    Incidents at highway-rail grade crossings, locations where railroad tracks intersect surface streets at grade, are a primary driver of safety in rail transportation in the United States. Addressing safety at these locations through technology is a focus of the Federal Railroad Administration and United States Department of Transportation. Effective ...
  • Chloride Diffusivity and Resistivity of Cured and Mature BinaryTernary Concrete Final Report
    Chloride Diffusivity and Resistivity of Cured and Mature Binary/Ternary Concrete [Final Report]
    Presuel-Moreno, Francisco J ;
    Kazemi, Amirkhosro
    2019-02-01 | PDF
    This investigation was performed to gain additional insight into the long-term durability of reinforced concrete structures. The chloride diffusion of concrete with supplementary cementitious materials is known to decrease with time, eventually reaching a stable value. This study aims to better understand when the chloride diffusion rate transition ...
  • Assessing Gazex Avalanche Control Effectiveness with Terrestrial Laser Scanning
    Assessing Gazex Avalanche Control Effectiveness with Terrestrial Laser Scanning
    Deems, Jeffrey S ;
    Gadomski, Peter J
    2019-02-01 | PDF
    This 2-year project used a ground-based laser scanner to map avalanche path snow depths to support an effectiveness assessment of recently-installed Gazex avalanche control systems in the Loveland Pass (Seven Sisters) and Berthoud Pass (Stanley) highway corridors. Scans were collected during snow-free conditions for a baseline, and then prior to an ...
  • Use of Nevadas Natural Pozzolans to Mitigate AlkaliSilica Reactivity
    Use of Nevada’s Natural Pozzolans to Mitigate Alkali-Silica Reactivity
    Ghafoori, Nader ;
    Kian, Arash
    2019-02-01 | PDF
    Alkali-silica reactivity is one of the most recognized deleterious phenomena in Portland cement concrete resulting in cracks, spalling, and other deleterious mechanisms. The aim of this study was (i) to assess the extent of reactivity of the aggregates, quarried from seven different sources, suspected of being conducive to ASR, and (ii) to compare ...
  • Successes in Stewardship CEDAR Helps States Increase Process Efficiencies in Project Development to Improve Environmental Compliance
    Successes in Stewardship - CEDAR Helps States Increase Process Efficiencies in Project Development to Improve Environmental Compliance
    United States. Federal Highway Administration
    2019-02-01 | PDF
    Successes in Stewardship is a Federal Highway Administration (FHWA) bimonthly newsletter highlighting current best practices in stewardship and environmental review from around the country.
  • Domestic Airline Fares Consumer Report Third Quarter 2018 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: Third Quarter 2018 Passenger and Fare Information
    United States. Department of Transportation
    2019-02-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
  • A Guide to Transportation Funding Options Available to Virginia Jurisdictions
    A Guide to Transportation Funding Options Available to Virginia Jurisdictions
    Moruza, Audrey K
    2019-02-01 | PDF
    This report provides a comprehensive summary of practices in Virginia jurisdictions for the purpose of raising local revenue for transportation purposes. To the extent possible, every current practice was located in the Code of Virginia to enable tracking of developments in the statutes and permissions referenced in the report. Transportation distr ...
  • PostInstallation Evaluation of the Effects of Ramp Metering in North Carolina
    Post‐Installation Evaluation of the Effects of Ramp Metering in North Carolina
    Davis, Joy ;
    Chase, Thomas
    2019-02-01 | PDF
    Since September 2017, the first four on‐ramp signals in North Carolina, positioned on the westbound lanes of I‐540 in Wake County, have been regularly activated Monday to Friday from 6:30 ‐ 9am. This report focused on the impact of these on‐ramp signals. The results identified are the product of data collected in the I‐540 WB area over multiple yea ...
  • Mechanical Bar Splices for Accelerated Construction of Bridge Columns
    Mechanical Bar Splices for Accelerated Construction of Bridge Columns
    Dahal, Puskar ;
    Tazarv, Mostafa
    2019-02-01 | PDF
    Compared with conventional lap splicing, mechanical splicing is an alternative method of connecting bars in reinforced concrete (RC) structures, and is used mainly to reduce bar congestion in joints. Recently, mechanical bar splices, which are also referred to as bar couplers, have been used in laboratories as a new type of precast column connectio ...
  • Comparison of Fresh Concrete Air Content Test Methods Analysis of Hardened Air Content in Wisconsin Pavements
    Comparison of Fresh Concrete Air Content Test Methods & Analysis of Hardened Air Content in Wisconsin Pavements
    Pham, Le T. ;
    Cramer, Steven M.
    2019-02-01 | PDF
    This research consisted of two phases: the first was a field study on the air void systems in Wisconsin pavements, and the second was a laboratory study to find the root causes of the problem identified in the field study. The first phase gathered sufficient measurements to verify the occurrence of disparities in air content measurements that had b ...
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