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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 3961 - 3980 of 36011 results
  • Improved Live Load Distribution Factors for Use in Load Rating of Older Slab and TBeam Reinforced Concrete Bridges
    Improved Live Load Distribution Factors for Use in Load Rating of Older Slab and T-Beam Reinforced Concrete Bridges
    Ravazdezh, Faezeh ;
    Ramirez, Julio A.
    2021-01-01 | PDF
    This report describes a methodology for demand estimate through the improvement of load distribution factors in reinforced concrete flat-slab and T-beam bridges. The proposed distribution factors are supported on three-dimensional (3D) Finite Element(FE) analysis tools. The Conventional Load Rating (CLR) method currently in use by INDOT relies on a ...
  • Calibration of Gas Flow Meters Using Choked Flow and an Evacuated Vessel
    Calibration of Gas Flow Meters Using Choked Flow and an Evacuated Vessel
    Trueblood, Max ;
    Schmid, Otmar
    2021-01-01 | PDF
    The measurement of gas flow rates is of great importance in a wide range of modern technologies. This paper introduces a simple, yet accurate technique for in-house calibration of gas FMs (mass and volumetric) even under harsh environmental conditions such as encountered during field measurement campaigns. The method requires only readily available ...
  • Inventory and Use of Material Spreader Systems Synthesis Report
    Inventory and Use of Material Spreader Systems: Synthesis Report
    CTC & Associates LLC
    2021-01-01 | PDF
    Material spreader systems are among the largest equipment expenses for winter road maintenance departments. These systems typically include a hopper or similar container to hold a supply of solid granular material; many also include a tank for dispensing a liquid. A chain conveyor or single/double auger system moves the granular material to the spi ...
  • Spatialtemporal Modeling of Electric Vehicles Charging Infrastructure and Management for a Sustainable Energy System
    Spatial-temporal Modeling of Electric Vehicles Charging Infrastructure and Management for a Sustainable Energy System
    Li, Xinwei
    2021-01-01 | PDF
    Transportation electrification is playing an increasingly essential role in mitigating climate change, especially coupled with a sustainable energy system. However, proper placement of charging infrastructures and management of charging activities is the key to ensuring the environmental benefits from the widespread adoption of electric vehicles. E ...
  • Evaluation of Premature Cracking in Urban Concrete Pavement
    Evaluation of Premature Cracking in Urban Concrete Pavement
    Roesler, Jeffery ;
    Montemayor, Roberto
    2021-01-01 | PDF
    This study investigated the causes for premature, transverse cracking on urban jointed plain concrete pavements in Illinois. A field survey of 67 sections throughout Illinois coupled with ultrasonic evaluation was completed to synthesize the extent of premature cracking on urban jointed plain concrete pavements (JPCP). The visual survey showed some ...
  • Determining Louisianas Roundabout Capacity
    Determining Louisiana’s Roundabout Capacity
    Codjoe, Julius ;
    Thapa, Raju
    2021-01-01 | PDF
    This study calibrated the HCM roundabout capacity models to incorporate local Louisiana driver behavior at single-lane roundabouts, using gap acceptance parameters measured from field data at forty-one approaches from seventeen roundabouts throughout the state. The correlation between these gap acceptance parameters and certain geometric features w ...
  • NJDOT UASDrone Procedures Manual and Best Practices for Use in New Jersey
    NJDOT UAS/Drone Procedures Manual and Best Practices for Use in New Jersey
    Agrawal, Anil K. ;
    Hoomaan, Ehssan
    2021-01-01 | PDF
    Recent advances in Unmanned Aircraft Systems (UAS) technologies have tremendous potential of improving the reliability and efficiency of inspections of transportation infrastructures, such as bridges, highways, railroads, construction projects, high mast light poles, etc. Two major challenges in the adoption of UAS operations for NJDOT transportati ...
  • HighMast Tower Foundation
    High-Mast Tower Foundation
    Sim, Chungwook  ;
    Song, Chung Rak
    2020-12-31 | PDF
    High-Mast Tower (HMT) foundations have been traditionally designed and constructed using cast-in-place foundation with anchor bolts that are used to secure the tower to the foundation. This type of design requires a base plate that is welded to the tower shaft. The Nebraska Department of Transportation (NDOT) has recently experienced issues with st ...
  • Preparing for Traffic Signal Operations in a MultiModal Connected and Autonomous Vehicle Environment
    Preparing for Traffic Signal Operations in a Multi-Modal Connected and Autonomous Vehicle Environment
    Hajbabaie, Ali ;
    Bin Al Islam, S M A
    2020-12-31 | PDF
    The objective of this research project is to help the Washington State Department of Transportation (WSDOT) identify the right time and location for selecting a corridor for connected vehicle (CV) implementation so that the technological needs and compatibilities are met and expected outcomes are significant. This research team surveyed twenty-one ...
  • Framework of Asphalt Balanced Mix Design BMD for New England Transportation Agencies
    Framework of Asphalt Balanced Mix Design (BMD) for New England Transportation Agencies
    University of Massachusetts Dartmouth. Department of Civil and Environmental Engineering
    2020-12-31 | PDF
    The objective of this study was to synthesize existing information and to develop recommendations for a rational Balanced Mix Design (BMD) approach for use by New England transportation agencies. A survey was developed and administered to ascertain information related to pavement distress for the NETC state agencies. The predominate distresses note ...
  • Research on Weather Conditions and Their Relationship to Crashes
    Research on Weather Conditions and Their Relationship to Crashes
    Anderson, Mark ;
    Khattak, Aemal J.
    2020-12-31 | PDF
    The objectives of the research were to conduct a seasonal investigation of when winter weather conditions are a factor in crashes reported in Nebraska, to perform statistical analyses on Nebraska crash and meteorological data and identify weather conditions causing the significant safety concerns, and to investigate whether knowing the snowfall amo ...
  • Investigation of Weather Conditions and Their Relationship to Crashes
    Investigation of Weather Conditions and Their Relationship to Crashes
    Anderson, Mark ;
    Khattak, Aemal J.
    2020-12-31 | PDF
    The objectives of the research were to conduct a seasonal investigation of when winter weather conditions are a factor in crashes reported in Nebraska, to perform statistical analyses on Nebraska crash and meteorological data and identify weather conditions causing the significant safety concerns, and to investigate whether knowing the snowfall amo ...
  • Life Cycle Cost and Performance of Lightweight Noise Barrier Materials along Bridge Structures
    Life Cycle Cost and Performance of Lightweight Noise Barrier Materials along Bridge Structures
    Odell, Wade ;
    Trevino, Manuel
    2020-12-31 | PDF
    The main objective of this study was to assess the feasibility and effectiveness of transparent lightweight noise barriers on IH-30 in Dallas, and to serve as a pilot project for TxDOT for future similar projects. An opportunity to implement similar research and extend the project arose with the noise study on SH 190. The research team undertook th ...
  • Efficiency Study of DesignBuild Program
    Efficiency Study of Design-Build Program
    Molenaar, Keith R. ;
    Torres-Machi, Cristina
    2020-12-31 | PDF
    This report summarizes a two-year study of the South Carolina Department of Transportation (SCDOT) Design-Build Program. The research examined design-build project selection, cost estimating procedures and overall project performance. The study benchmarked the SCDOT Design-Build Program against other state DOT programs through interviews, past proj ...
  • Reduction of pH Levels From Underdrain Outlets
    Reduction of pH Levels From Underdrain Outlets
    Bandara, Nishantha ;
    Jensen, Elin
    2020-12-31 | PDF
    Many government and private highway agencies have identified the benefits of using recycled aggregate in highway construction. The use of recycled aggregates in highway construction, not only decreases the demand for virgin aggregates, it offers a sustainable solution. However, previous research has identified some environmental concerns of using r ...
  • Pooled Versus Private RideHailing A Joint Revealed and Stated Preference Analysis Recognizing PsychoSocial Factors
    Pooled Versus Private Ride-Hailing: A Joint Revealed and Stated Preference Analysis Recognizing Psycho-Social Factors
    Kang, Shuqing ;
    Mondal, Aupal
    2020-12-31 | PDF
    Many government and private highway agencies have identified the benefits of using recycled aggregate in highway construction. The use of recycled aggregates in highway construction, not only decreases the demand for virgin aggregates, it offers a sustainable solution. However, previous research has identified some environmental concerns of using r ...
  • Latest Generation Data Portal for the Intelligent Mobility Meter
    Latest Generation Data Portal for the Intelligent Mobility Meter
    Pires, Bernardo R.
    ORCID ICON IMG
    2020-12-30 | PDF
    The Intelligent Mobility Meter (IMM) is a portable data acquisition and analysis platform for the collection of fine-grained statistics on pedestrian, cyclist and vehicular traffic. The IMM has grown out of three UTC-sponsored projects (“Automatic Counting of Pedestrians and Cyclists”, “Measuring Pedestrian Wait-Time at Intersections”, and “The Int ...
  • Comprehensive Cost of Rail Incidents in North Carolina
    Comprehensive Cost of Rail Incidents in North Carolina
    Bert, Steven ;
    Keller, Claire
    2020-12-28 | PDF
    This research provides a comprehensive appraisal and cost tool for the broad spectrum of events occurring on North Carolina’s rail network. It evaluates costs associated with property damage, casualty, and delay, rerouting, and supply chain events. It also analyzes upstream effects, emissions costs, railroad operating costs, and emergency responder ...
  • Driven Pile Load Test Data Analysis and Calibration of LRFD Resistance Factor for Mississippi Soils
    Driven Pile Load Test Data Analysis and Calibration of LRFD Resistance Factor for Mississippi Soils
    Steward, Eric ;
    Giron Gonzalez, Dianabel
    2020-12-22 | PDF
    The Mississippi Department of Transportation (MDOT) currently uses LRFD. However, the LRFD resistance factor used does not necessarily represent the Mississippi soils. A pair of authors have already calibrated LRFD resistance factors for other states using First Order Second Moment (FOSM). However, FOSM leads to over-conservatism. Thus, this study ...
  • CLEAR Technology Transfer and Metric Building
    CLEAR Technology Transfer and Metric Building
    Henard, David H
    2020-12-21 | PDF
    Managing knowledge is centered on deciding what is to be shared, by/with whom, and how to share it. Ultimately, organizational value is produced when the shared knowledge is used and reused. Consistent value is created when there is an atmosphere of mutual trust, when employees are motivated to share knowledge, and when there is a systematic proces ...
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