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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 1561 - 1580 of 36873 results
  • Impact of Truck Platooning on Loading of Bridges in Oregon
    Impact of Truck Platooning on Loading of Bridges in Oregon
    Scott, Michael ;
    Schumacher, Thomas
    2024-05-01 | PDF
    Truck platooning is an autonomous vehicle technology where multiple heavy trucks operate at close spacing. In 2018, Oregon House Bill HB 4059 Section 40 allowed limited implementation of such technology without requiring permitting or notification to ODOT. However, the close spacing of platooned trucks may impose loading on some bridges in excess o ...
  • Assessment of the Impact of Unacceptable HotMix Asphalt Test Parameters
    Assessment of the Impact of Unacceptable Hot-Mix Asphalt Test Parameters
    Hajj, Ramez ;
    Lu, Yujia
    2024-05-01 | PDF
    According to the current standard specifications and special provisions within the Illinois Department of Transportation, four quality assurance (QA) parameters are used to assess acceptability to remain in place for hot-mix asphalt (HMA) construction projects. However, when these parameters fall outside acceptable limits, it is not clear what impa ...
  • Enhancing and Generating GDOTs MUTCD Curve Sign Placement Design with Curve Finder and Curve Sign Determination
    Enhancing and Generating GDOT’s MUTCD Curve Sign Placement Design with Curve Finder and Curve Sign Determination
    Tsai, Yichang (James) ;
    Yang, Zhongyu
    2024-05-01 | PDF
    To meet MUTCD requirements for curve sign design, the Georgia Department of Transportation (GDOT) developed a MUTCD-compliant curve sign design practice that uses the Curve Advisory Reporting System (CARS) system developed by the Rieker company. However, processing the CARS data collected by GDOT using Rieker devices is labor-intensive, time-consum ...
  • Robust Wireless Skin Sensor Networks for LongTerm Fatigue Crack Monitoring of Bridges Phase I
    Robust Wireless Skin Sensor Networks for Long-Term Fatigue Crack Monitoring of Bridges (Phase I)
    Laflamme, Simon ;
    Liu, Han
    2024-05-01 | PDF
    In this project, we extended research and development of a novel sensing technology previously investigated in the pooled fund initiative TPF-5(328). The technology is a soft elastomeric capacitor (SEC) developed at Iowa State University. It is a geometrically large strain gauge, and its measurement principle is based on transducing changes in stra ...
  • Identification of a Response and Rescue Network for the St Louis Region
    Identification of a Response and Rescue Network for the St. Louis Region
    Edara, Praveen ;
    Chang, Dae Yeol
    2024-05-01 | PDF
    Emergency preparedness and response are crucial for mitigating the impact of natural disasters such as earthquakes. The St. Louis metropolitan region is vulnerable to earthquakes in the New Madrid and Wabash Valley Seismic Zones. This study focuses on understanding and addressing transportation impacts of an earthquake in the St. Louis region. An o ...
  • Leveraging Abandoned Railroad Tunnels for Bat Conservation
    Leveraging Abandoned Railroad Tunnels for Bat Conservation
    Johnson, Joseph S ;
    Kuchta, Shawn R
    2024-05-01 | PDF
    This report summarizes a study on abandoned tunnels' importance to bat populations in Ohio. We located 50 tunnels and surveyed 40 of these for one or more winter season. Little brown myotis, big brown bats, and tricolored bats were the most commonly observed species, with varying preferences for tunnel features. Key predictors of bat use such as tu ...
  • Benefit Analysis of Barrier Inlet Screens Fact Sheet
    Benefit Analysis of Barrier Inlet Screens [Fact Sheet]
    Kerns, Justin ;
    Winston, Ryan J
    2024-05-01 | PDF
    A wide range of debris from fine sediments to hubcaps and tires can enter ODOT roadside drainage inlets, disrupting the hydraulic capacity of sewer systems. This often leads to increased stormwater spread and ponding on roadways – a danger to motorists. Barrier inlets are particularly vulnerable to these issues given their minimal separation from t ...
  • Experiences With Autonomous Vehicle in US Cities
    Experiences With Autonomous Vehicle in U.S. Cities
    D’Agostino, Mollie Cohen ;
    Cooper, Elliott Michael
    2024-05-01 | PDF
    This project convened a series of meetings and workshops to prioritize listening to multi-sector stakeholders from local government, advocacy, and industry in US cities where autonomous vehicles are operating. The objective was to listen and learn from all stakeholders, raise issues surrounding accessibility and equity, and to solicit responses. Ke ...
  • Evaluation of Ramp Metering Effectiveness Along the I35 Corridor in the Kansas City Metropolitan Area Technical Summary
    Evaluation of Ramp Metering Effectiveness Along the I-35 Corridor in the Kansas City Metropolitan Area [Technical Summary]
    Kondyli, Alexandra ;
    Schrock, Steven D.
    2024-05-01 | PDF
    This research investigated the safety and operational benefits of ramp metering along the I-35 corridor in the Kansas City metropolitan area. A before-and-after study was conducted to compare selected performance measures, with a “before” period from August 2015 to December 2015 and an “after” period from October 2021 to February 2022. The research ...
  • Implementation and Monitoring of a NonProprietary UltraHigh Performance Concrete Bridge Deck Overlay
    Implementation and Monitoring of a Non-Proprietary Ultra-High Performance Concrete Bridge Deck Overlay
    Alvarez, Andres ;
    Weldon, Brad D.
    2024-05-01 | PDF
    Concrete bridge decks frequently experience deterioration caused by heavy traffic loads and harsh environmental conditions. New and more effective methods of repair are required to ensure that concrete bridge decks continue to perform adequately. Bridge deck overlays are a popular deck repair strategy as they increase cover for the deck reinforcing ...
  • Statewide Screening of Signalized Intersections for Capacity Improvements
    Statewide Screening of Signalized Intersections for Capacity Improvements
    Gayen, Saumabha ;
    Saldivar-Carranza, Enrique Daniel
    2024-05-01 | PDF
    Identification of congested traffic signals that require capital investment to increase capacity has historically been a time-consuming process. Signalized intersections with congestion were analyzed to see if they could be improved through retiming, and capital investment was only considered if retiming is deemed infeasible. Automated Traffic Sign ...
  • Identification of a Response and Rescue Network for the St Louis Region Research Summary
    Identification of a Response and Rescue Network for the St. Louis Region [Research Summary]
    University of Missouri--Columbia. Department of Civil and Environmental Engineering  ...
    2024-05-01 | PDF
    Emergency preparedness and response are crucial for mitigating the impact of natural disasters such as earthquakes. The St. Louis metropolitan region is vulnerable to earthquakes in the New Madrid and Wabash Valley Seismic Zones. This study focuses on understanding and addressing transportation impacts of an earthquake in the St. Louis region. An o ...
  • Does California HighSpeed Rail Promote Accessibility for Station Cities Case Study of Fresno and Merced Research Brief
    Does California High-Speed Rail Promote Accessibility for Station Cities?: Case Study of Fresno and Merced [Research Brief]
    Wang, Chih-Hao ;
    Chen, Na
    2024-05-01 | PDF
    High-speed rail (HSR) provides more frequent service, lower cost, easier station access, greater reliability, and increased safety, and therefore has been regarded as a more effective transportation mode as compared to aviation for distances of up to 425 miles/700 km. California is currently building a high-speed rail system (CHSR), which will run ...
  • Investigating the Use of Rapid Setting Hydraulic Cements RSHCs for Structural Applications
    Investigating the Use of Rapid Setting Hydraulic Cements (RSHCs) for Structural Applications
    Aguayo, Federico ;
    Torres, Anthony
    2024-05-01 | PDF
    Construction and replacement of infrastructure assets results in costly road closures. Rapid setting hydraulic cements (RSHCs), like calcium sulfoaluminate (CSA) cement and calcium aluminate cement (CAC), can dramatically reduce the time needed for construction. These cements are beginning to gain the attention of various stakeholders in the cement ...
  • Optimization of Cement Modified Recycled Base CMRB Mixture Design
    Optimization of Cement Modified Recycled Base (CMRB) Mixture Design
    Rangaraju, Prasad ;
    Naser, Mohannad
    2024-05-01 | PDF
    SCDOT is focused on improving the design of Cement-Modified Recycled Base (CMRB) to enhance the long-term durability and performance of pavements. The current approach emphasizes using unconfined compressive strength (UCS) and other parameters such as optimum moisture content (OMC) and maximum dry density (MDD) along with treatment depth in designi ...
  • Cone Penetration Testing for Illinois Subsurface Characterization and Geotechnical Design
    Cone Penetration Testing for Illinois Subsurface Characterization and Geotechnical Design
    Macedo, Jorge ;
    Mayne, Paul W.
    2024-05-01 | PDF
    This project sets the stage for implementing a cone penetration testing (CPT) practice in the state of Illinois, providing recommendations for using and interpreting CPT soundings in subsurface investigations. This study also contributes to modernizing Illinois Department of Transportation (IDOT) policy to current CPT-related practices adopted in o ...
  • Transit Workforce Development Challenges and Mitigation Practices
    Transit Workforce Development Challenges and Mitigation Practices
    Godfrey, Jodi
    2024-05-01 | PDF
    The objective of this research is to summarize previously conducted research related to workforce development challenges in the transit industry, detailing major findings and subsequent recommendations based on the annotated bibliography of the current atmosphere and most successful ways to mitigate those challenges to attract and retain talent in ...
  • Calibrating the Highway Safety Manual Predictive Methods for Texas Highways Technical Report
    Calibrating the Highway Safety Manual Predictive Methods for Texas Highways: Technical Report
    Geedipally, Srinivas R. ;
    Pratt, Michael P.
    2024-05-01 | PDF
    The Highway Safety Manual (HSM) contains safety performance functions (SPFs) that are used in project-level decision-making to estimate the average crash frequency by severity level for existing conditions, alternatives to existing conditions, or proposed new roadways. Because most existing HSM SPFs were developed for states other than Texas, SPF c ...
  • Assessing Safety and Mobility Benefits of Autonomous Ride Sharing Services Summary
    Assessing Safety and Mobility Benefits of Autonomous Ride Sharing Services [Summary]
    Holley, Gail M. ;
    Classen, Sherrilene
    2024-05-01 | PDF
    The objective of this project was to identify the user perspective about autonomous ride-sharing services for adults 50 years of age and older in Lake Nona, Port St. Lucie, and The Villages, and to solicit responses pertaining to the adoption and acceptance of these services.
  • Pavement Rehabilitation Analysis A LifeCycle Cost and LongTerm Performance Comparison of Full Depth Reclamation and Overlays
    Pavement Rehabilitation Analysis: A Life-Cycle Cost and Long-Term Performance Comparison of Full Depth Reclamation and Overlays
    Torres-Machi, Cristina ;
    Evers, Elijah
    2024-05-01 | PDF
    To reduce the environmental impact of transportation, Departments of Transportation (DOTs) are incorporating cold recycling technologies such as Full-Depth Reclamation (FDR) in their rehabilitation strategies. One of the limitations hindering the deployment of FDR is the limited information available on the material properties of these mixtures and ...
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