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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 1881 - 1900 of 35865 results
  • RailroadHighway Crossing Safety Improvement Evaluation and Prioritization Tool
    Railroad-Highway Crossing Safety Improvement Evaluation and Prioritization Tool
    Sriraj, P.S. ;
    Kawamura, Kazuya
    2023-06-01 | PDF
    The expected crash frequency model of Illinois Department of Transportation’s Bureau of Design and Environment needed improvement to incorporate track circuitry as well as pedestrian exposure at railroad-highway grade crossings to make the model more comprehensive. The researchers developed, calibrated, and validated three models to predict collisi ...
  • IRIPRAP 3D Image Analysis Software User Manual
    I-RIPRAP 3D Image Analysis Software: User Manual
    Huang, Haohang ;
    Luo, Jiayi
    2023-06-01 | PDF
    This research study introduces a new approach based on deep learning techniques that combines three developed research components: field 3D reconstruction procedures, 3D stockpiles instance segmentation, and 3D shape completion. The approach is designed to reconstruct aggregate stockpiles from multiple images, segment the stockpile into individual ...
  • Safest Placement for Crosswalks at Intersections
    Safest Placement for Crosswalks at Intersections
    Hurwitz, David ;
    Chai, Eileen
    2023-06-01 | PDF
    This research studied the relationship between crosswalk setback and intersection safety. The study included field-based and driving simulator experiments. Video data was collected at 10 crosswalks in Oregon to examine the frequency pedestrian-vehicle conflicts (measured using PET), including how these conflicts vary between corner and setback cros ...
  • Improving Ridership Projections of Proposed Bus and Rail Transit Projects to Evaluate Congestion Reduction Effects
    Improving Ridership Projections of Proposed Bus and Rail Transit Projects to Evaluate Congestion Reduction Effects
    Raida, Afrida ;
    Ohlms, Peter B.
    2023-06-01 | PDF
    Transit ridership data comprise one of the performance metrics examined when allocating funding to transportation projects, especially for those designed to reduce traffic congestion. The better the quality of the data, the more efficient the project prioritization process. The purpose of this study was to obtain better ridership data by answering ...
  • Balanced Mix Design for Surface Mixtures 2021 and 2022 Plant Mix Schedule Pilots
    Balanced Mix Design for Surface Mixtures: 2021 and 2022 Plant Mix Schedule Pilots
    Diefenderfer, Stacey D ;
    Boz, Ilker
    2023-06-01 | PDF
    Many state highway agencies are currently exploring a new approach for designing and accepting asphalt mixtures, known as the balanced mix design (BMD) method (hereinafter “BMD”). The Virginia Department of Transportation (VDOT) has made a commitment to adopt BMD to enhance the performance of asphalt mixtures. Since 2018, VDOT has taken incremental ...
  • Inventory Operations and Safety at Free RightTurn Ramps
    Inventory, Operations, and Safety at Free Right-Turn Ramps
    Khattak, Aemal J. ;
    Camenzind, Jonathon
    2023-05-31 | PDF
    This research focused on traffic safety and operational performance of rural, minor approach stop-controlled intersections with free right-turn (FRT) ramps. The objectives of the research were to: • Create a statewide inventory of rural FRT ramp intersections and provide to the Nebraska Department of Transportation (NDOT), • Using NDOT 10-year cras ...
  • Nebraska Balanced Mix Design Phase I
    Nebraska Balanced Mix Design – Phase I
    Yazdipanah, Farzad ;
    Khedmati, Mahdieh
    2023-05-31 | PDF
    Balanced mix design (BMD) is an alternative concept for designing asphalt mixtures that mainly focuses on performance of mixtures rather than only volumetric analysis. Using this concept, it would be possible to account for the incorporation of recycled asphalt mixtures, warm technology, polymers, rejuvenators, and other foreign additives, as well ...
  • Development of NonFracture Critical Steel Box Straddle Caps Project Summary Report
    Development of Non-Fracture Critical Steel Box Straddle Caps [Project Summary Report]
    Helwig, Todd ;
    Zecchin, Esteban
    2023-05-31 | PDF
    The research study included full-scale experimental testing and parametric finite element (FE) analyses, which resulted in a proposed methodology to estimate the flexural resistance of steel box caps following a potential fracture event. The work was conducted at the Ferguson Structural Engineering Laboratory at The University of Texas at Austin. T ...
  • 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 ...
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