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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 1741 - 1760 of 35478 results
  • 07033 Defining Operational Design Domains ODDs for the Safe Blending of Levels 04 Connected and Autonomous Vehicles CAVs in the Traffic Streams
    0-7033: Defining Operational Design Domains (ODDs) for the Safe Blending of Levels 0-4 Connected and Autonomous Vehicles (CAVs) in the Traffic Streams
    Chin, Kristie ;
    Wang, Junmin
    2023-05-31 | PDF
    Automated vehicles (AVs) present significant potential; yet, their technological maturity and performance remain to be proven. With several deployments underway in the state, it is critical for the Texas Department of Transportation (TxDOT) to provide the public with assurances that the AVs are performing safely in their intended operational enviro ...
  • Developing a Safe System Approach to Setting Speed Limits
    Developing a Safe System Approach to Setting Speed Limits
    Griswold, Julia B ;
    Lutzker, Liza
    2023-05-31 | PDF
    Over the last decade in California there has been a surge in the number of traffic fatalities, with especially large increases in pedestrian fatalities. At the same time, the California Department of Transportation (Caltrans) has affirmed a vision of reaching zero fatalities and serious injuries on state highways by 2050 and has committed the depar ...
  • Expanding the NCDOTs Current Risk Management Program
    Expanding the NCDOT’s Current Risk Management Program
    Jaselskis, Edward J. ;
    Gholami, Sina
    2023-05-31 | PDF
    Enhancing the risk management program within the North Carolina Department of Transportation (NCDOT) is the focus of this collaborative research project with North Carolina State University (NCSU). The objective is to provide valuable insights and best practices to strengthen the NCDOT's Value Management Office (VMO) and implement an effective risk ...
  • ALTRIOS Advanced Locomotive Technology and Rail Infrastructure Optimization System
    ALTRIOS - Advanced Locomotive Technology and Rail Infrastructure Optimization System
    National Renewable Energy Laboratory (NREL) (U.S.)  ...
    2023-05-17 | PDF
    The Advanced Locomotive Technology and Rail Infrastructure Optimization System (ALTRIOS) is an open-source modeling framework developed to evaluate strategies for decarbonizing freight rail transportation. Introduced at the 2023 FRA Workshop on Decarbonization of Rail Transportation, ALTRIOS simulates train dynamics, powertrain performance, energy ...
  • Greenhouse Gas Emissions Inventory from Construction of Washington State Department of Transportation Roadways Final Report
    Greenhouse Gas Emissions Inventory from Construction of Washington State Department of Transportation Roadways: Final Report
    Ashtiani, Milad ;
    Lewis, Meghan
    2023-05-16 | PDF
    Recent emphasis on actions to reduce large-scale greenhouse gas (GHG) emissions has pushed most state departments of transportation (DOTs) to develop carbon accounting practices compatible with their current standard data collection and storage practices. In particular, with the recently passed Buy Clean Acts in California, Colorado, and Oregon and ...
  • Evaluate Geophysical Methods to Detect Underground Voids Project Summary
    Evaluate Geophysical Methods to Detect Underground Voids [Project Summary]
    Kallivokas, Loukas ;
    Cai, Mingwei
    2023-05-05 | PDF
    The primary objective of the project is to lend clarity on the applicability and limitations of each one of the four geophysical methods, while also arriving at recommendations for the most appropriate course of action when faced with site investigations aimed at detecting the presence of voids.
  • Develop Guidance for Structural Behavior of Tall Haunches in TxDOT Beam and Girder Bridges Project Summary
    Develop Guidance for Structural Behavior of Tall Haunches in TxDOT Beam and Girder Bridges [Project Summary]
    Helwig, Todd A ;
    Khare, Nidhi
    2023-05-01 | PDF
    This study aimed to investigate the behavior of steel and concrete girder bridges with tall haunches and develop corresponding design guidelines. The research involved conducting push-out tests to assess the capacity and limit states that arise in the composite connection between bridge girders and concrete decks with tall haunches.
  • Guidance for Structural Behavior of Design and Detailing of Tall Haunches in Steel and Concrete Composite Girders
    Guidance for Structural Behavior of Design and Detailing of Tall Haunches in Steel and Concrete Composite Girders
    Khare, Nidhi ;
    Zhang, Zhenghao
    2023-05-01 | PDF
    This study aimed to investigate the behavior of steel and concrete girder bridges with tall haunches and develop corresponding design guidelines. The research involved conducting push-out tests to assess the capacity and limit states that arise in the composite connection between bridge girders and concrete decks with tall haunches. Additionally, t ...
  • Quality Control of Field Asphalt Mixtures and Compatibility of Aggregates and Emulsions using Asphalt Compatibility Tester
    Quality Control of Field Asphalt Mixtures and Compatibility of Aggregates and Emulsions using Asphalt Compatibility Tester
    Castorena, Cassie ;
    Yadav, Shivpal
    2023-05-01 | PDF
    The objectives of this project are to: (1) Establish a procedure to identify the optimum antistrip additive content for a given asphalt mixture and antistrip additive combination; (2) Evaluate the moisture damage resistance of plant-produced asphalt mixtures to establish a preliminary protocol for quality assurance and control; and (3) Develop an o ...
  • Rehabilitation and Load Rating of Deteriorated Timber Bridges in Colorado Parametric Investigations and Implementation
    Rehabilitation and Load Rating of Deteriorated Timber Bridges in Colorado: Parametric Investigations and Implementation
    Kim, Yail Jimmy
    2023-05-01 | PDF
    This report presents three major aspects that are related to the evaluation of timber bridges with and without repair: i) laboratory testing, ii) finite element modeling, and iii) load ratings. In addition, worked examples are provided to demonstrate the implementation of research findings. The first part of the report explores the effectiveness of ...
  • Roadside Truck Placard Readers for Advanced Notice and Response at SafetyCritical Facilities Phase 2
    Roadside Truck Placard Readers for Advanced Notice and Response at Safety-Critical Facilities: Phase 2
    Alden, Andrew S. ;
    Bell, Stephen
    2023-05-01 | PDF
    The transport of hazardous and dangerous materials (HAZMAT) through safety-critical facilities poses significant risk to overall system reliability should those assets be incapacitated by the occurrence of a related incident. This problem is particularly acute for facilities in remote locations such as Virginia’s mountain tunnels on Interstate 77 ( ...
  • Calibration of Highway Safety Manual Safety Performance Functions for Freeway Ramp Terminals in Virginia
    Calibration of Highway Safety Manual Safety Performance Functions for Freeway Ramp Terminals in Virginia
    Appiah, Justice
    2023-05-01 | PDF
    Chapter 19 of the Highway Safety Manual (HSM) provides safety performance functions (SPFs) for freeway ramps and crossroad terminals. The chapter includes 56 predictive models for ramp terminals characterized by terminal type, intersection control, crash severity, area type, and number of crossroad lanes. These SPFs were developed with data from ot ...
  • Comparing Public Transportation Services for Rural States in the Upper Midwest and Great Plains Region Executive Summary Surcom Research Summary
    Comparing Public Transportation Services for Rural States in the Upper Midwest and Great Plains Region — Executive Summary [Surcom Research Summary]
    Mattson, Jeremy ;
    Quayson, Bright
    2023-05-01 | PDF
    This study compares the level of public transportation services provided in North Dakota to those of the surrounding states of South Dakota, Montana, Wyoming, Nebraska, and Greater Minnesota. Separate analyses are performed for rural and urban transit. Overall, North Dakota performs well by some measures and not as well by others, but the level of ...
  • Optimal Approach for Addressing Reinforcement Corrosion for Concrete Bridge Decks in Illinois Phase II
    Optimal Approach for Addressing Reinforcement Corrosion for Concrete Bridge Decks in Illinois — Phase II
    Gombeda, Matthew J ;
    Lallas, Zoe N
    2023-05-01 | PDF
    This report presents the expansion of a previously introduced life-cycle cost calculation framework for concrete bridge decks in Illinois. In addition to the alternative reinforcement options examined in the Illinois Center for Transportation and Illinois Department of Transportation project R27-SP49, two additional reinforcing bar types—stainless ...
  • Understanding Transit and Shared Mobility Preferences PostCOVID
    Understanding Transit and Shared Mobility Preferences Post-COVID
    Fan, Yingling
    2023-05-01 | PDF
    Since the COVID-19 pandemic, the use of public transit and shared transportation services has plummeted, including in Greater Minnesota. Social distancing measures, general discomfort or safety concerns have resulted in a 40% reduction in trips throughout the state. Urban transit agencies have experienced a 55% reduction in revenue while smaller tr ...
  • Advancing Equity in Accessibility and Travel Experiences The Role of Gender and Identity
    Advancing Equity in Accessibility and Travel Experiences: The Role of Gender and Identity
    Fan, Yingling ;
    Song, Ying
    2023-05-01 | PDF
    Gender can have a significant influence on people’s behaviors and experiences. Hence, excluding gender diversity in transportation research and practices can result in biased or incomplete understandings of issues and perceptions about transportation and quality of life. This study examined whether and how gender, in a broader sense, can result in ...
  • Annual North Dakota Elevator Marketing Report 20212022
    Annual North Dakota Elevator Marketing Report, 2021–2022
    Vachal, Kimberly ;
    Andersen, Jaclyn
    2023-05-01 | PDF
    The objective of this report is to provide a benchmark for elevator managers in assessing performance and supply a source for recognizing trends in the characteristics of North Dakota elevators. This report and the statistics mailed to individual elevators are presented as a source of information for elevator managers and those interested in the No ...
  • Cost Estimate of B vs C Grade Asphalt Binders
    Cost Estimate of B vs. C Grade Asphalt Binders
    Yan, Tianhao ;
    Marasteanu, Mihai
    2023-05-01 | PDF
    Polymer-modified binders (PMB) have been shown over the decades to improve the mechanical properties of asphalt mixtures compared to unmodified binders. Considering the higher initial cost of PMB, selecting the best alternative is very important, especially for local agencies given their limited budgets. A challenge in the materials selection proce ...
  • Feasibility Study Application of Steel Sheet Piles for the Abutment of WaterCrossing Bridges in Nebraska
    Feasibility Study: Application of Steel Sheet Piles for the Abutment of Water-Crossing Bridges in Nebraska
    Kim, Seunghee ;
    Eun, Jongwan
    2023-05-01 | PDF
    The overall goal of this study is to investigate the anticipated performance of steel sheet-pile bridge abutments to encourage its wider application to not only new construction but also repair and replacement of existing water-crossing bridges in Nebraska. For this purpose, this study first reviewed several bridge cases with axially loaded sheet p ...
  • Massachusetts Depth to Bedrock Project
    Massachusetts Depth to Bedrock Project
    Mabee, Stephen B ;
    Duncan, Christopher C
    2023-05-01 | PDF
    The depth to bedrock is perhaps one of the most important surfaces that is fundamental to many practical engineering and geological problems. Yet it is not well understood everywhere. Knowing the depth to bedrock for transportation projects not only influences cost but may also affect selection of the appropriate foundation system for a particular ...
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