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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 3021 - 3040 of 35959 results
  • Generalized Skew Update and Regional Study of Distribution Shape for Texas Flood Frequency Analyses
    Generalized Skew Update and Regional Study of Distribution Shape for Texas Flood Frequency Analyses
    Cleveland, Theodore G. ;
    Fang, Nick Z
    2021-12-01 | PDF
    The research herein, performed under joint collaboration between researchers at Texas Tech University, the University of Texas at Arlington, and the U.S. Geological Survey (USGS) Oklahoma-Texas Water Science Center, aimed to update the Texas generalized skew map and its mean-square error for the Texas Department of Transportation (TxDOT) Hydraulic ...
  • Recruit and MaintainUpgrade a HighTech Workforce for Emerging Technologies
    Recruit and Maintain/Upgrade a High-Tech Workforce for Emerging Technologies
    Fard, Zahra Bahrani ;
    Dennis, Eric Paul
    2021-12-01 | PDF
    Over the past decade, the advancement of transportation technologies has been rapid. The introduction of technologies, including mobile robotics, Advanced Traffic Management Systems, ITS, and big data analytics, has the potential to transform the way transportation agencies conduct their operations. Many state departments of transportation (DOTs) a ...
  • DockBased and Dockless Bikesharing Systems Analysis of Equitable Access for Disadvantaged Communities
    Dock-Based and Dockless Bikesharing Systems: Analysis of Equitable Access for Disadvantaged Communities
    Jaller, Miguel ;
    Niemeier, Debbie
    2021-12-01 | PDF
    Dockless bikeshare systems show potential for replacing traditional dock-based systems, primarily by offering greater flexibility for bike returns. However, many cities in the US currently regulate the maximum number of bikes a dockless system can deploy due to bicycle management issues. Despite inventory management challenges, dockless systems off ...
  • Evaluating the Effects of Complete Streets on Mode Choice A Case Study in the BaltimoreWashington Area
    Evaluating the Effects of Complete Streets on Mode Choice, A Case Study in the Baltimore-Washington Area
    Erdogan, Sevgi ;
    Cirillo, Cinzia
    2021-12-01 | PDF
    The goal of this project is to enhance regional travel demand modeling capability of MDOT SHA by developing data-driven mode choice models that incorporates bicycling and walking among the modes so that impacts of Complete Street projects and plans can be forecasted in the future. To accomplish the project goals and objectives, a Stated Choice Expe ...
  • Evaluation of Coal Combustion Products in HotMix Asphalt Mixture
    Evaluation of Coal Combustion Products in Hot-Mix Asphalt Mixture
    Gao, Ya ;
    Hossain, Mustaque
    2021-12-01 | PDF
    Very fine coal combustion products (CCPs) are a by-product of burning coal when generating electricity. Fly ash has generally been used in portland cement concrete. However, some CCPs have been used in hot-mix asphalt (HMA) as mineral fillers. Due to current changes of Environmental Protection Agency (EPA) emission requirements, large volumes of fl ...
  • Effect of Superloads on Pavement Life WO19
    Effect of Superloads on Pavement Life (WO19)
    Vandenbossche, Julie M ;
    Donnelly, C.A.
    2021-12-01 | PDF
    Superloads (SLs) are a class of vehicles that typically exceed both gross vehicle weight limits and axle load limits, in addition to occupying two or more lanes of traffic. In PA, SLs require special permits but their effect on pavement distresses have not been evaluated. In this study, lab and computational analyses were combined to quantify the e ...
  • What Is an Effective Way to Measure Arterial Demand When It Exceeds Capacity
    What Is an Effective Way to Measure Arterial Demand When It Exceeds Capacity?
    Cetin, Mecit ;
    Yang, Hong
    2021-12-01 | PDF
    This project focused on developing and evaluating methods for estimating demand volume for oversaturated corridors. Measuring demand directly with vehicle sensors is not possible when demand is larger than capacity for an extended period, as the queue grows beyond the sensor, and the flow measurements at a given point cannot exceed the capacity of ...
  • Real Life Experiences with Major Pavement Types
    Real Life Experiences with Major Pavement Types
    Shah, Ayesha ;
    Olek, Jan
    2021-12-01 | PDF
    Pavement performance is a complex issue which depends on many contributing factors. Examining the performance of real-life pavements across the state determines what the actual service lives are for the pavements. For the purposes of this study, only selected LTPP projects were examined, along with a database containing all the historic repair proj ...
  • Analysis of Ohios Fine and Coarse Aggregate Reserve Balances
    Analysis of Ohio’s Fine and Coarse Aggregate Reserve Balances
    Abbas, Ala R. ;
    Mahmoud, Khaled M.
    2021-12-01 | PDF
    The primary goal of this research project was to assist the Ohio Department of Transportation (ODOT) in identifying fine or coarse aggregates that might be subject to supply shortfalls in the future, estimate the financial impact to ODOT of these shortfalls, and recommend appropriate policy options to pursue in the event of shortfalls in aggregate ...
  • Material Specifications for Longitudinal Joint Construction Remediation and Maintenance
    Material Specifications for Longitudinal Joint Construction, Remediation and Maintenance
    Bahia, Hussain ;
    Swiertz, Dan
    2021-12-01 | PDF
    Asphalt pavement density at and near longitudinal construction joints is often significantly lower than the density in the mainline areas of the pavement, which can manifest in premature deterioration of the joint area relative to the mainline. The objective of this project is to synthesize the most probable solutions to deliver better longitudinal ...
  • Development of Pavement Performance Models Using New Breakpoints and Pretreatment Conditions
    Development of Pavement Performance Models Using New Breakpoints and Pretreatment Conditions
    Chen, Don ;
    Nicholas II, Thomas
    2021-12-01 | PDF
    Previous studies indicated that two factors, traffic loading parameter and pre-treatment pavement condition, can have significantly impact on pavement performance and should be considered when developing pavement performance models. This study was conducted to use these two factors to develop new pavement performance models for the NCDOT Pavement M ...
  • Benchmarking GHG Emissions From California Concrete and Readily Implementable Mitigation Methods
    Benchmarking GHG Emissions From California Concrete and Readily Implementable Mitigation Methods
    Cunningham, Patrick R ;
    Miller, Sabbie A
    2021-12-01 | PDF
    The demand for concrete, which is conventionally composed of granular rocks (aggregates), water, and Portland cement (as well as other additives depending on desired performance) continues to grow. The manufacturing of Portland cement leads to notable greenhouse gas (GHG) emissions, which has driven interest in alternative concrete mixture designs, ...
  • Measuring the Efficiencies of Tow Plows and Wing Plows
    Measuring the Efficiencies of Tow Plows and Wing Plows
    Bennett, Duane ;
    Lasky, Ty
    2021-12-01 | PDF
    As agencies consider purchasing new types of snowplow equipment, it is important that they understand the trade-offs between equipment costs and potential gains in efficiency. Both tow plows and plows with wings represent a greater up-front investment but are designed to allow a plow operator to clear more snow in a single pass than a standard fron ...
  • BismarckMandan Regional ITS Architecture Update Version 40
    Bismarck-Mandan Regional ITS Architecture Update (Version 4.0)
    Upper Great Plains Transportation Institute  ...
    2021-12-01 | PDF
    The Bismarck-Mandan Regional Intelligent Transportation Systems (ITS) Architecture was prepared under the Bismarck-Mandan Metropolitan Planning Organization (Bis-Man MPO) leadership. The architecture was first developed in 2005, and since then, it has been updated three times in 2008, 2013, and 2021. The Bis-Man regional architecture (RA) aims to g ...
  • Superabsorbent Polymers for Internally Cured Concrete
    Superabsorbent Polymers for Internally Cured Concrete
    Adams, Caitlin J ;
    Bose, Baishakhi
    2021-12-01 | PDF
    Two commercial superabsorbent polymer (SAP) formulations were used to internally cure cement pastes, mortars, and concretes with a range of water-to-cement ratios (w/c 0.35–0.52). The following properties were determined as a function of cement chemistry and type, use of chemical admixtures, use of slag, and batching parameters: SAP absorption capa ...
  • Enhanced Camber Calculations for Prestressed Concrete Bridge Girders
    Enhanced Camber Calculations for Prestressed Concrete Bridge Girders
    Orton, Sarah ;
    Gopalaratnam, Vellore S.
    2021-12-01 | PDF
    The objective of this study was to develop accurate prestressed girder camber calculations and validate them with available data. The project team conducted a thorough literature review and analyzed recent girder camber research efforts in other states. The project collected existing data on 189 Missouri bridge girders. The project also collected f ...
  • North Dakota Grain and Oilseed Transportation Statistics 202021
    North Dakota Grain and Oilseed Transportation Statistics 2020–21
    Vachal, Kimberly ;
    Andersen, Jaclyn
    2021-12-01 | PDF
    This report represents a continuation of analysis concerned with the patterns and methods of distributing grain from North Dakota. The collection and compilation of this type of data began in 1956-57. The objectives of this report, like prior reports, are to provide the necessary database for identifying trends in the distribution of grain and oils ...
  • Measuring Foundation Course Modulus Using Falling Weight Deflectometer Light Weight Deflectometer and Dynamic Cone Penetration
    Measuring Foundation Course Modulus Using Falling Weight Deflectometer, Light Weight Deflectometer, and Dynamic Cone Penetration
    Barrett, Bruce ;
    Troxel, Kellie
    2021-12-01 | PDF
    There have been attempts in the past to forensically evaluate subgrade and foundation course strength that underly concrete pavement by Falling Weight Deflectometer (FWD) testing on top of doweled concrete. The accuracy of these data is unknown. The Falling Weight Deflectometer is a trailer mounted, non-destructive testing device that drops a weigh ...
  • Refining Inductive Loop Signature Technology for Statewide Vehicle Classification Counts
    Refining Inductive Loop Signature Technology for Statewide Vehicle Classification Counts
    Liao, Chen-Fu
    2021-12-01 | PDF
    Transportation agencies in the U.S. use devices such as loop detectors, automatic traffic recorders (ATR), or weigh-in- motion (WIM) sensors to monitor the performance of traffic network for planning, forecasting, and traffic operations. With a limited number of ATR and WIM sensors deployed throughout the state roadways, temporary double tubes are ...
  • Field Evaluation of Hardening Methods for Subsurface Utilities and Drainage Pipes
    Field Evaluation of Hardening Methods for Subsurface Utilities and Drainage Pipes
    Hosseini, Payam ;
    Faeli, Zahra
    2021-12-01 | PDF
    A new field monitoring approach in the form of metallic capsules is developed to evaluate Benzene and PCE diffusion through concrete pipe gaskets. The capsules are developed and tested with three gasket materials: Neoprene, Buna-N, and Viton. To validate the monitoring approach and develop field retrieval protocol, capsules were deployed in three c ...
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