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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 3741 - 3760 of 36908 results
  • 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 ...
  • Perform Feasibility Study on Use of Innovative Tools and Techniques to Accelerate Pavement Construction Project Summary
    Perform Feasibility Study on Use of Innovative Tools and Techniques to Accelerate Pavement Construction [Project Summary]
    Goehl, Darlene ;
    Scullion, Tom
    2021-08-31 | PDF
    The Texas Department of Transportation is facing an increase in pavement reconstruction projects over the next several years. However, many roadways needing reconstruction and widening are in metro areas where traffic handling and user delay costs are a major expense. This project investigated innovative tools and techniques to accelerate pavement ...
  • Examine TradeOffs Between Center Separation and Shoulder Width Allotment for a Given Roadway Width Project Summary
    Examine Trade-Offs Between Center Separation and Shoulder Width Allotment for a Given Roadway Width [Project Summary]
    Geedipally, Srinivas R. ;
    Brewer, Marcus A.
    2021-08-31 | PDF
    In this research project, researchers evaluated the safety and operational benefits of converting a four-lane undivided highway into other cross-section alternatives without changing the total roadway width. First, researchers selected a sample of rural highway segments with various cross sections, including four-lane undivided, four-lane with a 4- ...
  • Evaluation Selection Criteria for TxDOT Form 2088 Surface Aggregate Selection Form Project Summary
    Evaluation Selection Criteria for TxDOT Form 2088, Surface Aggregate Selection Form [Project Summary]
    Goehl, Darlene ;
    Park, Eun Sug
    2021-08-31 | PDF
    The researchers performed a synthesis study to evaluate the factors and criteria included in Form 2088. The current state of the practice and emerging research for the criteria used to determine pavement friction demand and availability were evaluated for flexible pavement surfaces. The researchers prepared and distributed a survey to TxDOT and oth ...
  • 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 ...
  • 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 ...
  • Development of Guidelines for the Use of Intermediate Diaphragms on Precast Concrete Beam Superstructures
    Development of Guidelines for the Use of Intermediate Diaphragms on Precast Concrete Beam Superstructures
    Eamon, Christopher D. ;
    Menkulasi, Fatmir
    2021-08-27 | PDF
    This study examines the need for intermediate diaphragms (IDs) and lateral support on low skew, low curvature prestressed concrete (PC) bridges while in-service and under construction. AASHTO beam, bulb tee, and spread box beam sections across a variety of span lengths and girder spacings were considered. To examine the in-service effect of IDs on ...
  • NCDOT Customer Service Survey 201920
    NCDOT Customer Service Survey 2019-20
    McCaleb, Emeline ;
    Davis, Joy
    2021-08-25 | PDF
    Across North Carolina, the North Carolina Department of Transportation (NCDOT) provides transportation services for a variety of functions and uses. Customer satisfaction is identified as an NCDOT priority as part of the department’s Strategic Plan. Since 2015, NCDOT has measured customer service through a statewide survey focused on asking custome ...
  • Pooling or Not Pooling The Role of Matching Cost on Mixed Mode Equilibria and VMT
    Pooling or Not Pooling: The Role of Matching Cost on Mixed Mode Equilibria and VMT
    Han, Xiao ;
    Zhang, H Michael
    2021-08-25 | PDF
    Carpooling is often promoted as a mode to reduce traffic congestion and vehicle miles traveled in road networks. This project develops a game-based mode-choice model for the morning commute involving carpooling supported by a ridesharing platform. In the model, commuters travel from homes in the suburb (Origin) to offices in downtown (Destination) ...
  • Gaps and Opportunities in Accessibility Policy for Autonomous Vehicles
    Gaps and Opportunities in Accessibility Policy for Autonomous Vehicles
    Riggs, William ;
    Pande, Anurag
    2021-08-24 | PDF
    Nearly 1 in 5 people in the US have a disability (more than 57 million) (U.S. Census Bureau), and people with disabilities use the automobile as a travel mode at significantly lower rates than people without disabilities (Bureau of Transportation Statistics). For example, people aged 18 to 64 with disabilities make 28% fewer trips per day (2.6 v. 3 ...
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