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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 761 - 780 of 35448 results
  • Countermeasures for Maintaining Safe and Effective Public Transit Service in the PostCOVID19 Era
    Countermeasures for Maintaining Safe and Effective Public Transit Service in the Post-COVID-19 Era
    Qi, Yi ;
    Zhao, Qun
    2024-08-01 | PDF
    During the COVID pandemic, to prevent the spread of the virus, countries adopted various safety measures, including masking, social distancing, and vaccination. However, there is a lack of methods that can quantitively evaluate the effectiveness of these countermeasures. To fill the gap, this research first develops a model to quantitively evaluate ...
  • Using Vehicle Probe Data to Evaluate Speed Limits Project Summary
    Using Vehicle Probe Data to Evaluate Speed Limits [Project Summary]
    Fitzpatrick, Kay ;
    Kutela, Boniphace
    2024-08-01 | PDF
    When speed limits are set via an engineering speed zone study, the operating speed for a site is needed. This research project investigated whether probe speed data (rather than speeds measured in the field) could reasonably be used in a speed zone study. The idea for using probe speed data is to develop conversion equations that would convert an a ...
  • Development of Improved Inspection Techniques Using LiDAR for Deteriorated Steel Beam Ends
    Development of Improved Inspection Techniques Using LiDAR for Deteriorated Steel Beam Ends
    Provost, Aidan ;
    Gerasimidis, Simos
    2024-08-01 | PDF
    This report summarizes the research on enhancing the current inspection protocols for MassDOT using 3D scanning technologies. The first part of the report presents a thorough review of the current methods using 3D scanning techniques for bridge inspection. The report also includes laboratory and field scans on corroded beam ends. The research team ...
  • Proactive Traffic Incident Management in Alabama
    Proactive Traffic Incident Management in Alabama
    Liu, Jun ;
    Zhang, Zihe
    2024-08-01 | PDF
    The recent availability of the state-wide large-scale real-time traffic database, traffic incident database, and road crash database has enabled more efficient traffic incident management. This project aims to assist traffic incident management (TIM) in Alabama by leveraging three large-scale real-time databases maintained by ALDOT including the AL ...
  • Develop a Retrofit Design for Guard Fence System To Enhance Motorcycle Safety
    Develop a Retrofit Design for Guard Fence System To Enhance Motorcycle Safety
    Schulz, Nathan D. ;
    Bligh, Roger P.
    2024-08-01 | PDF
    Motorcyclists are among the most vulnerable users of the roadway system. The appropriate design of roadside safety systems plays an important role in the severity of injuries caused by motorcycle crashes. Data show that from 2004 to 2017, the number of fatalities related to motorcycle impacts against safety barriers was greater than the number of f ...
  • FX2Division Shared Bicycle and Pedestrian Platform Evaluation
    FX2-Division: Shared Bicycle and Pedestrian Platform Evaluation
    McNeil, Nathan ;
    Kothuri, Sirisha
    2024-08-01 | PDF
    To accommodate passing bicyclists and transit riders accessing the new FX2 TriMet bus rapid transit line in Portland, TriMet worked with the City of Portland and broad group of stakeholders and partners to design and implement a new shared use bus platform that incorporates a sidewalk / platform level bike lane. The SE Division corridor was designa ...
  • Develop Safety Scoring Tool for the Wet Surface Crash Reduction Program Project Summary
    Develop Safety Scoring Tool for the Wet Surface Crash Reduction Program [Project Summary]
    Wu, Lingtao ;
    Nyamuhokya, Tito
    2024-08-01 | PDF
    Minimizing pavement impact on wet weather crashes is essential to the Wet Surface Crash Reduction Program (WSCRP). Currently, the Texas Department of Transportation has two methods to evaluate pavement friction: the Safer by Design (SBD) method and the pavement surface aggregate classification selection, Form 2088. The research team developed a fra ...
  • Safety Evaluation of Jturn Intersections in Missouri
    Safety Evaluation of J-turn Intersections in Missouri
    Edara, Praveen ;
    Qing, Zhu
    2024-08-01 | PDF
    The design of J-turn intersections has gained its prevalence in Missouri due to their demonstrated safety benefits. However, with the growing number of J-turns and the availability of more crash data, there is a renewed need to deepen the understanding of the safety performance of J-turns. This study presents a comprehensive safety evaluation of J- ...
  • Safety Evaluation of Jturn Intersections in Missouri Research Brief
    Safety Evaluation of J-turn Intersections in Missouri [Research Brief]
    Edara, Praveen
    ORCID ICON IMG
    2024-08-01 | PDF
    The design of J-turn intersections has gained its prevalence in Missouri due to their demonstrated safety benefits. However, with the growing number of J-turns and the availability of more crash data, there is a renewed need to deepen the understanding of the safety performance of J-turns. This study presents a comprehensive safety evaluation of J- ...
  • GoGallatin Annual Report July 1 2023 June 30 2024
    GoGallatin Annual Report: July 1, 2023 – June 30, 2024
    Harriet, Nathan ;
    Madsen, Matthew
    2024-08-01 | PDF
    This third annual report seeks to share our programmatic growth, successes, and areas for improvement with our partners and the community. We are proud of our work, the work of our partners, and are excited for our future, and we think you will be as well.
  • Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity
    Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity
    Kumar, V Vinay ;
    Roodi, Gholam H.
    2024-08-01 | PDF
    A comprehensive full-scale field monitoring program involving different types of geosynthetic reinforcement products was successfully implemented. The monitoring system included asphalt strain gauges, thermocouples, geophones, and moisture sensors. The monitoring results indicate that all asphalt overlay sections reinforced with geosynthetic reinfo ...
  • 07002 Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity Summary
    0-7002: Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity [Summary]
    Kumar, V Vinay ;
    Roodi, Gholam H.
    2024-08-01 | PDF
    Geosynthetic products, including geogrids, geotextiles, geocells, geonets, and geomembranes, can be used to improve roadway systems significantly through a wide range of functions, such as separation, filtration, stiffening, reinforcement, drainage, hydraulic/gas barriers, and protection. One of the several applications involving geosynthetics is t ...
  • Analysis of Asphalt Mixtures Using Alternative Aggregate in SMA and Superpave
    Analysis of Asphalt Mixtures Using Alternative Aggregate in SMA and Superpave
    Liu, Jenny ;
    Kassem, Emad
    2024-08-01 | PDF
    To identify locally available, cost-effective, and durable crushed coarse aggregates for Stone Matrix Asphalt (SMA) and high-level Hot Mix Asphalt (HMA) mixes, multiple well-distributed aggregates have been evaluated in this study as candidate aggregates, including traprock (control), chat, gravels, steel slag, limestone, and dolomite. Aggregate sc ...
  • Friction Enhancements to Asphalt Pavement Surfaces
    Friction Enhancements to Asphalt Pavement Surfaces
    Roshan, Alireza ;
    Abdelrahman, Magdy
    2024-08-01 | PDF
    Maintaining the appropriate amount of pavement friction is critical for safe driving. Missouri Department of Transportation (MoDOT) has used high friction surface treatment (HFST) since 2013 to restore pavement surface friction where traffic has worn down pavement surface aggregates and to improve wet crash locations. Conventional HFST application ...
  • iTrain Immersive Training of Department of Transportation Work Zone Inspectors using Virtual Reality
    iTrain – Immersive Training of Department of Transportation Work Zone Inspectors using Virtual Reality
    Edara, Praveen K. ;
    Qing, Zhu
    2024-08-01 | PDF
    This report presents the development, implementation, and evaluation of Virtual Reality (VR) training modules designed to enhance work zone safety training for the Missouri Department of Transportation (MoDOT) staff. The project aimed to provide immersive, realistic, and interactive training environments that improve knowledge retention, engagement ...
  • Friction Enhancements to Asphalt Pavement Surfaces Research Summary
    Friction Enhancements to Asphalt Pavement Surfaces [Research Summary]
    Abdelrahman, Magdy
    ORCID ICON IMG
    2024-08-01 | PDF
    Title 14 of the Code of Federal Regulations defines regulations that are intended to protect aircraft occupants in the event of a survivable civil aircraft crash. The standards for emergency landing conditions (25.562) were developed with a focus primarily on forward-facing seats, although the rules apply to all seats regardless of installation ori ...
  • iTrain Immersive Training of Department of Transportation Work Zone Inspectors using Virtual Reality Research Summary
    iTrain – Immersive Training of Department of Transportation Work Zone Inspectors using Virtual Reality [Research Summary]
    Edara, Praveen K.
    ORCID ICON IMG
    2024-08-01 | PDF
    The iTrain project, in collaboration with the Missouri Department of Transportation (MoDOT), aimed to enhance work zone safety training of MoDOT staff through the development and implementation of virtual reality (VR) training modules. These modules were designed to provide immersive, realistic, and interactive scenarios to enhance knowledge retent ...
  • Determine Adequacy of Existing Roadside Barriers on HighSpeed Roadways
    Determine Adequacy of Existing Roadside Barriers on High-Speed Roadways
    Chamargore, Sonal ;
    Bligh, Roger
    2024-08-01 | PDF
    Longitudinal barriers (e.g., guardrails, median barriers, and bridge rails) are currently tested and evaluated at a design impact speed of 62 mph. Posted speed limits have increased in recent years. New or modified barrier designs may be needed to withstand high-speed impacts to maintain the desired level of safety for motorists traveling on high-s ...
  • Initiating Seed Production for Effective Establishment of Native Plants on Roadsides in New England Fact Sheet
    Initiating Seed Production for Effective Establishment of Native Plants on Roadsides in New England [Fact Sheet]
    Kuzovkina, Julia ;
    Campanelli, John
    2024-08-01 | PDF
    This report provides guidance for the establishment of native habitats in New England. It describes the seed mixes of native plants for various soil conditions, establishment of native habitats using various techniques, guidelines for conservation mowing and ecotypic seed production in the region.
  • Define a Statewide Plan for a Sustainable RealTime Travel Time Network for Texas Hurricane Evacuations and Safe Citizen Return Final Report
    Define a Statewide Plan for a Sustainable Real-Time Travel Time Network for Texas Hurricane Evacuations and Safe Citizen Return – Final Report
    Bathgate, Kyle ;
    Xu, Lu
    2024-08-01 | PDF
    Texas coastal areas are prone to hurricanes, which pose a threat to life, public safety, and critical infrastructure. Mass evacuation can be ordered to relocate residents to safety areas in advance of a hurricane. Access to accurate real-time traffic information can aid public agencies with evacuation operations and evacuees with decision-making. T ...
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