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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 4381 - 4400 of 36908 results
  • Using Emerging and Extraordinary Data Sources To Improve Traffic Safety
    Using Emerging and Extraordinary Data Sources To Improve Traffic Safety
    Tarko, Andrew P. ;
    Guo, Qiming
    2021-01-01 | PDF
    The current safety management program in Indiana uses a method based on aggregate crash data for conditions averaged over several-year periods with consideration of only major roadway features. This approach does not analyze the risk of crashes potentially affected by time-dependent conditions such as traffic control, operations, weather and their ...
  • Influence of Internal Curing on Measured Resistivity
    Influence of Internal Curing on Measured Resistivity
    Milla, Jose ;
    Rupnow, Tyson
    2021-01-01 | PDF
    The objective of this study was to evaluate the influence of internal curing and coarse aggregate type on concrete’s 28-day strength, as well as surface resistivity over time (at days 7, 14, 28, 56, 90, and 180). A total of 96 concrete mixtures were prepared to identify the effects of three coarse aggregate types, two water-to-cementitious (w/cm) r ...
  • Transportation Sales Taxes in Los Angeles Lessons from Forty Years of Experience
    Transportation Sales Taxes in Los Angeles: Lessons from Forty Years of Experience
    Wachs, Martin ;
    Amberg, Natalie
    2021-01-01 | PDF
    This is the second study of voter-approved transportation sales taxes in Los Angeles County performed by the UCLA Institute of Transportation Studies with support from the Haynes Foundation. The earlier study examined the history of the four half cent sales taxes enacted by voters in Los Angeles County between 1980 and 2016. The current study looke ...
  • Load Ratings for Standard Bridges Tech Transfer Summary
    Load Ratings for Standard Bridges [Tech Transfer Summary]
    Moffitt, Stephen W. ;
    Peterson, Jon E.
    2021-01-01 | PDF
    The primary objective of this project was to investigate the load carrying capacity of bridges designed using the current Iowa Department of Transportation (DOT) secondary road standard bridge plans which are based on Load and Resistance Factor Design (LRFD) methods. Proper evaluation of the load carrying capacity requires the use of Load and Resis ...
  • A Framework for Shaping the Deployment of Autonomous Vehicles and Advancing Equity Outcomes
    A Framework for Shaping the Deployment of Autonomous Vehicles and Advancing Equity Outcomes
    Steckler, Becky ;
    Howell, Amanda
    2021-01-01 | PDF
    Using experience from working on the Knight Autonomous Vehicle (AV) Initiative, Urbanism Next created this white paper to provide a foundation for public sector agencies to approach autonomous vehicle deployment and policy with a focus on equity. This report outlines ways that public agencies can identify community needs and shape deployment to ens ...
  • Using the Light Weight Deflectometer for PerformanceBased Quality Assurance Testing of Chemically Modified Subgrades
    Using the Light Weight Deflectometer for Performance-Based Quality Assurance Testing of Chemically Modified Subgrades
    Becker, Peter J.
    ORCID ICON IMG
    2021-01-01 | PDF
    This report documents the findings from SPR-4230 (Alternative Quality Assurance Methods for Compacted Subgrade). The main objective of SPR-4230 involved establishing performance-related quality assurance (QA) test methods for pavement subgrade construction. Because INDOT generally prefers specifying subgrade treatment type IBC (i.e., 14-in. cement ...
  • Load Rating for Standard Bridges Final Report for TR785
    Load Rating for Standard Bridges – Final Report for TR-785
    Moffitt, Stephen W. ;
    Peterson, Jon E.
    2021-01-01 | PDF
    In this report, seventeen Iowa secondary and primary bridge standards for three types of bridges are rated utilizing the Load and Resistance Factor methodology and AASHTO BrR Bridge Rating software, Version 6.8.4.3001. Load ratings in this report are in compliance with the AASHTO Manual for Bridge Evaluation, 3rd Edition, with Interim Specification ...
  • Repair and Strengthening of Bridges in Indiana Using Fiber Reinforced Polymer Systems Volume 1 Review of Current FRP Repair Systems and Application Methodologies
    Repair and Strengthening of Bridges in Indiana Using Fiber Reinforced Polymer Systems: Volume 1 - Review of Current FRP Repair Systems and Application Methodologies
    Pevey, Jon M. ;
    Rich, William B.
    2021-01-01 | PDF
    For bridges that are experiencing deterioration, action is needed to ensure the structural performance is adequate for the demands imposed. Innovate repair and strengthening techniques can provide a cost-effective means to extend the service lives of bridges efficiently and safely. The use of fiber reinforced polymer (FRP) systems for the repair an ...
  • Evaluation of DOTDs Existing Queue Estimation Procedures
    Evaluation of DOTD’s Existing Queue Estimation Procedures
    Codjoe, Julius ;
    Thapa, Raju
    2021-01-01 | PDF
    Louisiana Department of Transportation and Development (DOTD) requests that freeway lanes should not be closed for construction work during hours when capacity exceeds 1,309 pcphpl. It is not known how accurate this 1,309 pcphpl value is when compared to actual queuing related to real world work zones in Louisiana. This study provided literature on ...
  • Louisiana Transportation Research Center 20192020 Annual Report
    Louisiana Transportation Research Center: 2019–2020 Annual Report
    Louisiana Transportation Research Center
    2021-01-01 | PDF
    This publication is a report of the transportation research, technology transfer, education, and training activities of the Louisiana Transportation Research Center for July 1, 2019–June 30, 2020. The center is sponsored jointly by the Louisiana Department of Transportation and Development and Louisiana State University.
  • Michigan Department of Transportation Research Advisory Committee Region 3 Peer Exchange October 1315 2020
    Michigan Department of Transportation Research Advisory Committee Region 3 Peer Exchange: October 13-15, 2020
    CTC & Associates LLC
    2021-01-01 | PDF
    The Michigan Department of Transportation (MDOT) hosted a virtual peer exchange meeting on October 13-15, 2020, to discuss topics related to transportation research goals, strategies and processes with other state DOTs. The meeting and the subsequent publication of this report fulfill the agency’s obligation to conduct a periodic peer exchange as p ...
  • 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 ...
  • Development of CostEffective Sensing Systems and Analytics CeSSA To Monitor Roadway Conditions and Mobility Safety
    Development of Cost-Effective Sensing Systems and Analytics (CeSSA) To Monitor Roadway Conditions and Mobility Safety
    Ho, Chun-Hsing ;
    Zhang, Dada
    2021-01-01 | PDF
    The project presents a pavement sensing system along with a list of promising computing models that can be used to predict pavement conditions using a vehicle-based sensing technology. The project started with data acquisition obtained from the previous field data collection followed by a series of data computing using machine learning methods to d ...
  • Predictive Deep Learning for Flash Flood Management
    Predictive Deep Learning for Flash Flood Management
    Corns, Steven M ;
    Long, Suzanna K
    2021-01-01 | PDF
    This research was completed in tandem as a project funded through MoDOT and the Mid-America Transportation Center. It used deep learning methods, along with weather information from NOAA/National Weather Service and geospatial data from the USGS National Map and other public geospatial data sources, to develop forecasting tools capable of assessing ...
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