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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 1201 - 1220 of 36114 results
  • 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 ...
  • Developing Guidelines for the Use of Lightweight Materials in Culvert Preservation
    Developing Guidelines for the Use of Lightweight Materials in Culvert Preservation
    Sun, Charlie ;
    Ashurst, Kean H.
    2024-05-01 | PDF
    This study addresses challenges that arise during highway embankment construction on road widening projects when additional fill is placed above existing culverts. Researchers conducted reduced-scale model laboratory tests to simulate culvert behavior under different loading conditions and to determine how well lightweight materials (LWMs) perform ...
  • Recruiting and Retaining Staff
    Recruiting and Retaining Staff
    Balyagati, Philip ;
    Ngereza, Abdul
    2024-05-01 | PDF
    The Ohio Department of Transportation (ODOT) has been challenged to address a shortage of staff due to staff turnover, less hiring of full-time staff, and increasing technological capabilities all of which have been exacerbated by the retirement of the baby-boomer generation from the workforce. It is imperative that ODOT explore and implement innov ...
  • The Impact of Diamond Grind Pavement Resurfacing on PM10 Emissions
    The Impact of Diamond Grind Pavement Resurfacing on PM10 Emissions
    Miech, Jason ;
    Fraser, Matthew
    2024-05-01 | PDF
    An assessment of tire-wear emissions was conducted to identify differences due to diamond ground and asphalt rubber asphalt concrete friction surfaces. The evaluation involved collecting representative aerosol samples from local freeways with both surface types under different meteorological conditions and with varying traffic conditions. The field ...
  • Develop a Methodology for Pavement Drainage System Rating Research Project Capsule 242P
    Develop a Methodology for Pavement Drainage System Rating: Research Project Capsule [24–2P]
    Chen, Qiming ;
    Rupnow, Tyson
    2024-05-01 | PDF
    In the realm of pavement engineering, the management of water and its impact on infrastructure longevity is of paramount importance. Water can lead to various degrees of damage to roadways, ranging from the formation of potholes to less visible issues such as the weakening of subsurface materials. One of the primary reasons for pavement failures is ...
  • Recruiting and Retaining Staff Fact Sheet
    Recruiting and Retaining Staff [Fact Sheet]
    Balyagati, Philip ;
    Ngereza, Abdul
    2024-05-01 | PDF
    The Ohio Department of Transportation (ODOT) has been challenged to address a shortage of staff due to staff turnover, less hiring of full-time staff and increasing technological capabilities all of which have been exacerbated by the retirement of the baby-boomer generation from the workforce. It is imperative that ODOT explore and implement innova ...
  • Dynamic Prediction of Shared Micromobility Usage with MultiTask Learning Brief
    Dynamic Prediction of Shared Micromobility Usage with Multi-Task Learning [Brief]
    Guo, Yujie ;
    Zhang, Yu
    2024-05-01 | PDF
    Taxis and Transportation Network Companies (TNCs) are important components of the urban transportation system. An accurate short-term forecast of passenger demand can help operators better allocate taxi or TNC services to achieve supply–demand balance in real time. As a result, drivers can improve the efficiency of passenger pick-ups, thereby reduc ...
  • Evaluation of Ramp Metering Effectiveness Along the I35 Corridor in the Kansas City Metropolitan Area
    Evaluation of Ramp Metering Effectiveness Along the I-35 Corridor in the Kansas City Metropolitan Area
    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 ...
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