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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 2021 - 2040 of 36151 results
  • Assessing Axial Capacities of Auger Cast Piles from Measuring While Drilling Summary
    Assessing Axial Capacities of Auger Cast Piles from Measuring While Drilling [Summary]
    Herrera, Rodrigo ;
    Rodgers, Michael
    2023-05-01 | PDF
    Developing a comprehensive subsurface profile can be difficult, especially in certain areas in Florida where sandy soils with varying amounts of fines, clay, muck/peat and vuggy limestone formations add to the uncertainty of the overall response that can be expected from drilled-in-place deep foundations. Measuring while drilling (MWD) was develope ...
  • Pedestrian Traffic Signal Violations Safety Design and Operational Implications
    Pedestrian Traffic Signal Violations: Safety, Design, and Operational Implications
    Singleton, Patrick A. ;
    Mekker, Michelle
    2023-05-01 | PDF
    The objective of this research project is to improve pedestrian safety at signalized intersections by focusing on pedestrian signal violations: measuring behaviors, associating characteristics and locations, and identifying potential mitigation strategies. In this project, we recorded videos and collected and analyzed observational data on pedestri ...
  • Connected VehicleCentric Dashboards for TMC of the Future
    Connected Vehicle-Centric Dashboards for TMC of the Future
    Sakhare, Rahul Suryakant ;
    Desai, Jairaj
    2023-05-01 | PDF
    The adoption of dashboards and tools into Traffic Management Centers (TMC) has been growing with advancements in connected vehicle (CV) data. These tools are now being utilized—not only for analyzing work zones, severe crashes, winter operations, and traffic signals—but also to provide measures for characterizing overall system mobility, resiliency ...
  • Optimized HotMix Asphalt Lift Configuration for Performance
    Optimized Hot-Mix Asphalt Lift Configuration for Performance
    Al-Qadi, Imad L ;
    Ramakrishnan, Aravind
    2023-05-01 | PDF
    Researchers conducted eight large-scale laboratory tests to assess the combined impact of hot-mix asphalt (HMA) overlay mix and thickness on its performance to control reflective cracking. Bonding efficiency, flexibility, and stiffness of the HMA mix as well as overlay thickness significantly affect an overlay’s performance against reflective crack ...
  • Traffic Safety Toolbox Addressing Speeds
    Traffic Safety Toolbox – Addressing Speeds
    Sullivan, James L. ;
    Rowangould, Dana
    2023-05-01 | PDF
    Reducing speeding and aggressive driving is one of seven critical emphasis areas identified in the Vermont Highway Safety Plan, which targets reductions in major crashes on Vermont highways. Vermont towns recognize the need to discourage speeding and implement countermeasures that will bring speeds down to posted speed limits, especially in transit ...
  • Evaluating Metrics and Performance to Advance Transportation Equity
    Evaluating Metrics and Performance to Advance Transportation Equity
    Elgart, Zachary
    ORCID ICON IMG
    2023-05-01 | PDF
    MnDOT operates under an Equity Lens Framework, which, in addition to supporting the core agency values of accountability as well as diversity and inclusion, emphasizes underrepresented groups to achieve equitable outcomes. Measures and methods to evaluate transportation program equity impacts, however, have generally been lacking. To assess both sy ...
  • Performance of High EarlyStrength Materials Used in Concrete Bridge Repair
    Performance of High Early-Strength Materials Used in Concrete Bridge Repair
    Ebrahim, Zina ;
    Pozo-Lora, Fray F
    2023-05-01 | PDF
    High early-strength materials are widely used for rapid concrete patching projects to limit road closure time and traffic obstruction. This research investigated the field performance of multiple high early-strength materials used in maintenance projects across Nebraska. Data from high early-strength products included in the state’s approved produc ...
  • 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 ...
  • Evaluation of RightofWay Fence Tags to Reduce AnimalVehicle Collisions
    Evaluation of Right-of-Way Fence Tags to Reduce Animal-Vehicle Collisions
    Gagnon, Jeffrey W. ;
    Beach, Colin A.
    2023-05-01 | PDF
    Animal-vehicle collisions (AVC) pose a serious and growing threat to motorists traveling on ADOT roads. Solutions exist to effectively mitigate AVC, such as wildlife crossing structures (overpasses and underpasses), however these solutions can be costly and untimely. Fence tags, a small reflective tag that is attached to the right-of-way fence and ...
  • Incorporation Resilience Considerations in Transportation Planning TSMO and Asset Management
    Incorporation Resilience Considerations in Transportation Planning, TSMO and Asset Management
    Amekudzi-Kennedy, Adjo ;
    Ashuri, Baabak
    2023-05-01 | PDF
    This project integrates risk-based asset management procedures from the FHWA, AASHTO and the TRB with decision making under deep uncertainty (DMDU) concepts to develop climate vulnerability assessment, and planning and project evaluation capabilities for resilience building in transportation. The research framework includes: (1) understanding the c ...
  • Applied Ergonomics
    Applied Ergonomics
    Guo, Xingzhou ;
    Chen, Yunfeng
    2023-05-01 | PDF
    Ergonomic injuries and solutions have been extensively studied in the construction industry; however, the prevalence of work-related injuries, risky activities, and effective solutions in the transportation industry are not understood. This study aims to explore the prevalence of work-related injuries, risky activities, and potentially ergonomic so ...
    Supporting Files
  • 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 ( ...
  • The Development of Knowledge in the Application of StrutandTie Methods
    The Development of Knowledge in the Application of Strut-and-Tie Methods
    Wang, Hwa-Ching ;
    Daou, Anas
    2023-05-01 | PDF
    The strut-and-tie method (STM) is a reliable and widely used approach for designing reinforced concrete members, but there are still gaps in knowledge that need to be addressed to optimize its use in common design scenarios. Addressing these gaps would lead to more efficient and cost-effective design solutions. This requires additional experimental ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Consultant Support for Intelligent Compaction and PaverMounted Thermal Profiling Projects in 20222023
    Consultant Support for Intelligent Compaction and Paver-Mounted Thermal Profiling Projects in 2022-2023
    Chang, George K ;
    Gilliland, Amanda
    2023-05-01 | PDF
    Due to the success of the MoDOT 2017-2021 Intelligent Compaction and Paver-Mounted Thermal Profiling (IC-PMTP) projects that demonstrate the paving quality improvements on numerous field projects, MoDOT has established a plan that includes additional IC-PMTP projects in 2022 and 2023. To ensure the continued success of the MoDOT IC-PMTP projects in ...
  • NYC DOT Curbside Level 2 EV Charging Pilot Evaluation Report
    NYC DOT Curbside Level 2 EV Charging Pilot: Evaluation Report
    New York (N.Y.). Department of Transportation  ...
    2023-05-01 | PDF
    In June 2021, the New York City Department of Transportation (NYC DOT), in partnership with Con Edison, launched the city’s first curbside electric vehicle (EV) charging pilot program. The pilot includes 100 on-street Level 2 chargers distributed across 35 locations in the five boroughs. Up to 20 additional chargers have been or are in the process ...
  • 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 ...
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