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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 3361 - 3380 of 36151 results
  • School Traffic Trip Generation Calculator Evaluation and Data Collection
    School Traffic Trip Generation Calculator Evaluation and Data Collection
    Kearns, Brendan ;
    Davis, Joy
    2021-09-01 | PDF
    This project focused on the collection of new data to add to the NCDOT School Traffic Calculator (STC), with a specific focus on estimates generated for vehicular rates and queue length. School travel data was collected at schools across North Carolina. This sample included schools of various types in varied geographic areas. Schools continue to be ...
  • Draft Specification for Compaction Monitoring System
    Draft Specification for Compaction Monitoring System
    Crockford, Bill ;
    Liu, Wenting
    2021-09-01 | PDF
    The scope of this research is to use the compaction monitoring system to obtain a real-time and post-construction assessment of breakdown roller compaction effectiveness. This method includes procedures for determining compaction index (CI) using a compaction monitoring system (CMS). This method is not to be used for pay factor or acceptance decisi ...
  • Test Procedure for GPR for Asphalt Mixture Construction
    Test Procedure for GPR for Asphalt Mixture Construction
    Wilson, Bryan ;
    Sebesta, Stephen
    2021-09-01 | PDF
    The scope of this study was to obtain a density profile of an asphalt paving project using ground penetrating radar (GPR). This document includes procedures for general system calibration, calibration of the GPR to the specific asphalt mixture, data collection, analysis procedures, and report summary.
  • Autonomous Traffic Mobile Attenuator ATMA Tabletop Exercise 2021 Summary Report
    Autonomous Traffic Mobile Attenuator (ATMA) Tabletop Exercise 2021 Summary Report
    Morehead, William ;
    Peterson, Jake
    2021-09-01 | PDF
    The Autonomous Maintenance Technology Pooled Fund, TPF 5(380) contracted with All Clear Emergency Management Group to develop, facilitate, and evaluate a Pooled Fund wide tabletop exercise involving the Autonomous Traffic Mobile Attenuator (ATMA)/Autonomous Impact Protection Vehicle (AIPV) crash. The scope of this summary report includes the design ...
  • Improving and Communicating Speed Management Practices Project Summary Report
    Improving and Communicating Speed Management Practices: Project Summary Report
    Fitzpatrick, Kay ;
    Venglar, Steven P.
    2021-08-31 | PDF
    Posted speed limits (PSLs) are a highly complex issue involving engineering, human factors, and political and societal concerns. On a national level, recent research and calls to change how speed limit are set, especially for city streets, have generated extensive discussion of future speed-limit-setting procedures. Within this Texas Department of ...
  • Automated and Connected Vehicle AVCV Test Bed To Improve Transit Bicycle and Pedestrian SafetyPhase III Project Summary
    Automated and Connected Vehicle (AV/CV) Test Bed To Improve Transit, Bicycle, and Pedestrian Safety—Phase III [Project Summary]
    Turnbull, Katherine F. ;
    Sunkari, Srinivasa
    2021-08-31 | PDF
    Public transit vehicles, pedestrians, and bicyclists share roads in urban, suburban, and rural environments in Texas. Signalized intersections in urban areas are complex shared spaces where crashes involving transit vehicles, bicyclists, and pedestrians can occur. This research explored the potential of automated and connected vehicle (AV/CV) techn ...
  • Research on Dimensionless Unit Hydrograph and Time of Concentration for Maryland Watersheds
    Research on Dimensionless Unit Hydrograph and Time of Concentration for Maryland Watersheds
    Brubaker, Kaye L ;
    Karam Zadeh, Mani Shehni
    2021-08-31 | PDF
    Observed data from 100 rainfall-runoff events on 54 watersheds in Maryland and Delaware were used to investigate two watershed characteristics: the dimensionless unit hydrograph (DUH) and time of concentration (Tc). Streamflow hydrograph data were obtained from US Geological Survey gaging stations. Event hyetographs were generated from US Weather S ...
  • Work Zone Traffic Engineering Strategies for Flagger Stations and Lane Closures Project Summary
    Work Zone Traffic Engineering Strategies for Flagger Stations and Lane Closures [Project Summary]
    Theiss, LuAnn ;
    Finley, Melisa D.
    2021-08-31 | PDF
    Work zones in Texas experience significant numbers of end-of-queue crashes. Research was needed to identify and evaluate countermeasures for these crashes. The objective of this research project was to identify and evaluate strategies to mitigate end-of-queue crashes at flagging stations on two-lane roads.
  • Bus on the Edge Continuous Monitoring of Traffic and Infrastructure Year 2
    Bus on the Edge: Continuous Monitoring of Traffic and Infrastructure – Year 2
    Ye, Canbo ;
    Mertz, Christoph
    2021-08-31 | PDF
    For the purpose of safety and liability, transit buses nowadays usually have cameras installed to observe the environment around the buses, together with some other sensors like GPS and IMU. Such data sources are undoubtedly valuable to the ambitions of a resilient and intelligent transportation system. For example, these live data streams can be a ...
  • Transportation Communication Tower Inspection Using Novel UAV Technologies Policy Brief
    Transportation Communication Tower Inspection Using Novel UAV Technologies [Policy Brief]
    Congress, Surya S C ;
    Puppala, Anand J.
    2021-08-31 | PDF
    Transportation communication towers facilitate telecommunications that are essential for Intelligent Transportation Systems (ITS) applications in advancing transportation safety and mobility operations. State DOTs and other agencies spend considerable amount of dollars annually to maintain towers as they are an integral part of their assets.
  • Building Capacity for Climate Adaptation Assessing the Vulnerability of Transportation Infrastructure to Sea Level Rise for Safety Enhancement in RITI Communities
    Building Capacity for Climate Adaptation: Assessing the Vulnerability of Transportation Infrastructure to Sea Level Rise for Safety Enhancement in RITI Communities
    Shen, Suwan ;
    Shim, Dayea
    2021-08-31 | PDF
    Sea level rise (SLR) and more frequent extreme weather events are an emerging concern for transportation infrastructures in coastal areas. In particular, the livelihoods and transportation safety of vulnerable populations such as indigenous rural communities may be at higher risk to sea-level rise and exacerbated coastal flooding due to their heavy ...
  • A DataDriven Safety Dashboard Assessing Maryland Statewide Density Exposure of Pedestrians Bicycles and EScooters
    A Data-Driven Safety Dashboard Assessing Maryland Statewide Density Exposure of Pedestrians, Bicycles, and E-Scooters
    Xiong, Chenfeng ;
    Mahmoudi, Jina
    2021-08-31 | PDF
    This project’s ultimate deliverable is a functional Vulnerable User Density Dashboard (https://mti.umd.edu/sdi) for the state of Maryland. The dashboard uses mobile device location data and electric scooter volume data to reflect pedestrian, bicycle, and electric scooter travel volumes and their exposure to roadway safety risk across all roadways i ...
  • Develop a Retrofit Design for Guard Fence System To Enhance Motorcycle Safety Project Summary
    Develop a Retrofit Design for Guard Fence System To Enhance Motorcycle Safety [Project Summary]
    Schulz, Nathan D. ;
    Bligh, Roger P.
    2021-08-31 | PDF
    A retrofit design was developed and evaluated to improve safety for motorcyclists impacting guard fence systems. Finite element computer simulations were used to evaluate and optimize the crashworthy performance of the design for motorcyclist and vehicle impacts. Full-scale crash tests were conducted to verify the performance of the system for moto ...
  • Sequencing and Placement of Noise Walls and Retaining Walls on Complex TxDOT Projects Project Summary
    Sequencing and Placement of Noise Walls and Retaining Walls on Complex TxDOT Projects [Project Summary]
    Harbin, Kris
    2021-08-31 | PDF
    Difficulties can arise when constructing noise walls and retaining walls due to utility conflicts, construction phasing, and inadequate access. The goal of this research was to provide guidance on the sequencing and placement of noise walls and retaining walls. The research included examining noise and retaining wall selection, standards and specif ...
  • Riprap Filters and Stability of Riprap Covered Slopes Project Summary
    Riprap Filters and Stability of Riprap Covered Slopes [Project Summary]
    Briaud, Jean-Louis ;
    Sfeir, Jerome
    2021-08-31 | PDF
    The project focused on two main objectives: • Determining if a filter is necessary between the riprap layer and the underlying soil and then recommending design and installation guidelines for riprap filters (granular and geosynthetic). • Examining issues related to placing riprap on an abutment or riverbank slope and the associated stability of th ...
  • Guidance for the Use of UAS During Suboptimal Environmental Conditions Project Summary
    Guidance for the Use of UAS During Suboptimal Environmental Conditions [Project Summary]
    Quiroga, Cesar ;
    Starek, Michael J.
    2021-08-31 | PDF
    This research documented key challenges and developed and tested procedures for data collection and processing, with a focus on traffic incident management (TIM) activities such as crash reconstructions. The research included a review of historical crash data trends in Texas, simulation of the effect of environmental factors on the quality of photo ...
  • 06953 StrutandTie Modeling and Design of Drilled Shaft Footings Project Summary
    0-6953: Strut-and-Tie Modeling and Design of Drilled Shaft Footings [Project Summary]
    Bayrak, Oguzhan ;
    Yi, Yousun
    2021-08-31 | PDF
    The strut-and-tie method (STM) is a design method intended to provide realistic strength and detailing requirements for deep structural members subjected to non-linear distribution of strain by considering idealized flow of internal forces. Axially loaded concrete struts and ties are used to represent the compression and tension fields in structura ...
  • Expanding FDR Technologies in Maintenance Operations Project Summary
    Expanding FDR Technologies in Maintenance Operations [Project Summary]
    Scullion, Tom
    2021-08-31 | PDF
    Full-depth reclamation (FDR) is the main approach used across Texas to rehabilitate thin roadways that are structurally damaged. In the FDR process, the existing surface and base materials are pulverized, mixed together, and treated with a stabilizer. The compacted treated base then receives a final surfacing. The stabilizers historically used by t ...
  • Mileage Based User Fee Funding and Deployment Planner for State Transportation Funding Agencies
    Mileage Based User Fee Funding and Deployment Planner for State Transportation Funding Agencies
    Matthews, H Scott ;
    Yuan, Chenyu
    2021-08-30 | PDF
    The current motor fuel tax (MFT) system in the US does not generate sufficient revenue for infrastructure development. To make up for the lack of revenue and to keep up with expenditures, states have begun to explore alternatives such as mileage-based user fees (MBUF). Using federal and state level data and Pennsylvania as a case study, the authors ...
  • State and Local Government Data Analysis Tools to Support Policy and Decision Making for Roadway Safety MassDOT IMPACT Safety Analysis Module
    State and Local Government Data Analysis Tools to Support Policy and Decision Making for Roadway Safety – MassDOT IMPACT Safety Analysis Module
    Polin, Bonnie ;
    Chirokas, David
    2021-08-29 | PDF
    The Massachusetts Department of Transportation (MassDOT) identified the need to build safety analysis tools into the recently-developed Interactive Mapping Portal for Analysis and Crash Tracking (IMPACT) Crash Data Portal. MassDOT worked with highway safety stakeholders to summarize their needs then developed four tools to be added: Crash-Based Net ...
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