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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 2461 - 2480 of 36114 results
  • Impacts to Traffic Behaviour From Queue Warning Truck Current Pilot Project
    Impacts to Traffic Behaviour From Queue Warning Truck: Current Pilot Project
    Sakhare, Rahul Suryakant ;
    Mahlberg, Justin
    2022-10-01 | PDF
    The Indiana Department of Transportation (INDOT) started deploying queue warning trucks ahead of interstate work zonestoalert motorists of queued traffic. Along with visually alerting the motorists, digital alerts were integrated with navigational applications such as Apple Maps, Waze, and the in-vehicle infotainment system of Stellantis vehicles. ...
  • Educating the Public About Distracted Driving and Evaluating DistractionPrevention Technologies
    Educating the Public About Distracted Driving and Evaluating Distraction-Prevention Technologies
    Jeihani, Mansoureh ;
    Javid, Ramina
    2022-10-01 | PDF
    Distracted driving is one of the main causes of injuries and fatalities in the United States. 3,142 people were killed, and 324,000 were injured because of distracted driving in 2020. According to previous studies, cell phone use is one of the main sources of distraction while driving. The percentage of young drivers who never text and drive under ...
  • Developing a Roadmap for Digital Delivery in Iowa Strategic Plan for Digital Delivery
    Developing a Roadmap for Digital Delivery in Iowa [Strategic Plan for Digital Delivery]
    Iowa. Department of Transportation
    2022-10-01 | PDF
    The Iowa Department of Transportation (DOT) uses a wide range of data to support business functions across the enterprise. While data is not always available, accessible, or reliable, it is critical for developing products that meet the needs of the Department’s customers and supporting DOT business operations. The Department recognizes the urgency ...
    Supporting Files
  • ActivityBased Household Travel Survey Through Smartphone Apps in Tennessee
    Activity-Based Household Travel Survey Through Smartphone Apps in Tennessee
    Xie, Mengjun ;
    Wu, Da lei
    2022-10-01 | PDF
    Activity-based household travel surveys (HTS) are one of primary data sources for many research fields at Tennessee Department of Transportation (TDOT). Traditional HTS methods are often costly, time-consuming, less scalable, and difficult to achieve high quality and accuracy. Recent years have witnessed a fast-growing interest in conducting HTS th ...
  • Feasibility Study on Geophysical Methods to Estimate Geotechnical Properties in Louisiana
    Feasibility Study on Geophysical Methods to Estimate Geotechnical Properties in Louisiana
    Ferguson, Nicholas ;
    Gautreau, Gavin
    2022-10-01 | PDF
    Subsurface investigations currently rely on conventional soil borings with the aid of cone penetrometer test (CPT)soundings. However, these geotechnical explorations can be expensive and information is not provided between bore holes. Geophysical methods can aid in providing some information between the boreholes at a lower cost for the Louisiana D ...
  • Investigation of Rural Roadway Departures
    Investigation of Rural Roadway Departures
    Burbidge, Shaunna K. ;
    Anderson, Camille
    2022-10-01 | PDF
    Roadway fatalities are a major priority in the transportation sector. UDOT has noted that fatalities increased in 2020 with the leading cause, by a substantial margin, being rural roadway departures. Knowledge about the specific characteristics of rural roadway departure crashes can help UDOT to develop proper mitigation strategies. This research w ...
  • Development of Crash Modification Factors for Speed Management of Traffic Signal Progression Summary
    Development of Crash Modification Factors for Speed Management of Traffic Signal Progression [Summary]
    Lin, Pei-Sung ;
    El-Urfali, Alan
    2022-10-01 | PDF
    This research project investigated the impacts of traffic signal progression strategy on the safety of pedestrians and bicyclists. The CUTR team used historical (crash, traffic, and roadway) data, cross-sectional study designs, and random parameter negative binomial models to estimate the effects of signal progression design on pedestrian and bicyc ...
  • An Analysis of Virtual Public Engagement in the Transportation Planning Process
    An Analysis of Virtual Public Engagement in the Transportation Planning Process
    Dougald, Lance E ;
    Williams, Eric S
    2022-10-01 | PDF
    Public engagement is an important and required element of the transportation planning process. Since the onset of the COVID-19 pandemic, public engagement has shifted dramatically. Agencies of all sizes accelerated their transition to virtual engagement in 2020 to comply with shelter-in-place orders and social distancing guidelines. Social media an ...
  • Large Culvert Inspection Procedures Guidelines for INDOT
    Large Culvert Inspection Procedures: Guidelines for INDOT
    Grier, Scott M ;
    Williams, Christopher S
    2022-10-01 | PDF
    Within the state of Indiana, there are approximately 9,000 structures with unsupported span lengths that range from 4 ft to 20ft that the Indiana Department of Transportation (INDOT) is responsible for maintaining. These structures are referred to as large culverts by INDOT. The agency recognized the need to improve culvert inspection procedures so ...
  • Crawfordsville Technical Services Asset Management Workflow Improvement Project
    Crawfordsville Technical Services Asset Management Workflow Improvement Project
    Boehm, Ted ;
    Handy, Jim
    2022-10-01 | PDF
    The Indiana Department of Transportation (INDOT) is divided into six districts, with district offices located in LaPorte, Fort Wayne, Crawfordsville, Greenfield, Vincennes, and Seymour. Each district has a Technical Services Department responsible for (with support from INDOT Central Office staff) managing the INDOT assets within the district and p ...
  • Research Project 931050 Research the Application of GeoGIS in Support of ALDOT Georeferenced Documents
    Research Project 931-050, Research the Application of GeoGIS in Support of ALDOT Geo-referenced Documents
    University of Alabama. Center for Transportation Operations, Planning and Safety
    2022-10-01 | PDF
    Research Project 931-050, Research the Application of GeoGIS in Support of ALDOT Geo-Referenced Documents was a continuation of the GeoGIS project initiated and led by ALDOT Materials and Test. After transitioning GeoGIS to ALDOT in a previous project, Project 931-050 continued to populate documents in GeoGIS, improve user satisfaction with GeoGIS, ...
  • Pile Stability Analysis in Soft or Loose Soils Guidance on Foundation Design Assumptions With Respect to Loose or Soft Soil Effects on Pile Lateral Capacity and Stability and Rating Criteria
    Pile Stability Analysis in Soft or Loose Soils: Guidance on Foundation Design Assumptions With Respect to Loose or Soft Soil Effects on Pile Lateral Capacity and Stability and Rating Criteria
    Wang, Yao ;
    Lim, Jeehee
    2022-10-01 | PDF
    The design of laterally loaded piles is often done in practice using the p-y method with API p-y curves representing the behavior of soil at discretized points along the pile length. To account for pile-soil-pile interaction in pile groups, AASHTO (2020) proposes the use of p-multipliers to modify the p-y curves. In this research, we explored, in d ...
  • Developing a Consistent Data Driven Methodology to Multimodal Performance Based and Context Sensitive Design
    Developing a Consistent Data Driven Methodology to Multimodal, Performance Based and Context Sensitive Design
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2022-09-30 | PDF
    Transportation agencies have begun to adopt design practices that introduce greater flexibility and promote a more holistic approach to design as opposed to a strict adherence in designing to standards. This allows for explicit consideration of economic, social, and environmental resources as opposed to more traditional design strategies that are l ...
  • Determining Sample Measures of Distracted Driving Distracted Pedestrian Activities and Impacts of Such Behavior on Traffic Operations at Signalized Intersections
    Determining Sample Measures of Distracted Driving, Distracted Pedestrian Activities and Impacts of Such Behavior on Traffic Operations at Signalized Intersections
    Abou-Senna, Hatem ;
    Radwan, Essam
    2022-09-30 | PDF
    Distracted drivers and pedestrians pose one of the most difficult challenges to ensuring a safe and efficient transportation system. Modern communications have delivered greater convenience. However, this has come at the cost of attention spans. Safety has been thoroughly explored in terms of distracted driving and pedestrians. However, impacts on ...
  • Anomaly Detection and String Stability Analysis in Connected Automated Vehicular Platoons
    Anomaly Detection and String Stability Analysis in Connected Automated Vehicular Platoons
    Wang, Yiyang ;
    Zhang, Ruixuan
    2022-09-29 | PDF
    In this study, the authors develop a comprehensive framework to model the impact of cyberattacks on safety, security, and head-to-tail stability of connected and automated vehicular platoons. First, the authors propose a general platoon dynamics model with heterogeneous time delays that may originate from the communication channel and/or vehicle on ...
  • Statistical analysis of DCP data to evaluate resilient modulus of reclaimed stabilized base Multiple locations Vermont
    Statistical analysis of DCP data to evaluate resilient modulus of reclaimed stabilized base. Multiple locations, Vermont
    Wimett, Jacob ;
    Du, Mangtao
    2022-09-28 | PDF
    The purpose of this study is to determine through statistical analysis if the dynamic cone penetrometer (DCP) can be used as a reliable method of quality assurance to evaluate in-situ resilient modulus (MR) of a reclaimed stabilized base (RSB) in full depth reclamation (FDR) projects. DCP data collected by contractors from the RSB layer at the time ...
  • Statistical Analysis of DCP Data to Evaluate Resilient Modulus of Reclaimed Stabilized Base. Multiple Locations, Vermont [Supporting Dataset]
    Wimett, Jacob ;
    Du, Mangtao
    2022-09-28 | ZIP
    The purpose of this study is to determine through statistical analysis if the dynamic cone penetrometer (DCP) can be used as a reliable method of quality assurance to evaluate in-situ resilient modulus (MR) of a reclaimed stabilized base (RSB) in full depth reclamation (FDR) projects. DCP data collected by contractors from the RSB layer at the time ...
    Dataset Supporting Files
  • Development of a Test to Quantify Organic Content in Silica Sand
    Development of a Test to Quantify Organic Content in Silica Sand
    Bastardo, Johann ;
    Morrison, Elise
    2022-09-08 | PDF
    Fine aggregates used for concrete can sometimes contain organic matter that can inhibit the cement hydration reactions and reduce strength. AASHTO T 21 and AASHTO T 71 have been developed as screening tests for fine aggregate organic matter and quality. The objective of this research project is to determine whether a modified Walkley Black test or ...
  • Automated Identification of Traffic Detector Malfunctions
    Automated Identification of Traffic Detector Malfunctions
    Smaglik, Edward J. ;
    Riffle, Katherine
    2022-09-01 | PDF
    There is a need to improve signalized intersection operations through identifying malfunctioning detectors, as recent work has shown that errors in data quality and accuracy may be widespread due to issues with aging equipment and unmet maintenance needs. Accordingly, there is a desire for policies, procedures, and techniques to identify malfunctio ...
  • Assessment of Maintenance Strategies for Biostabilization of Mudslides on Wildfireaffected Slopes
    Assessment of Maintenance Strategies for Bio-stabilization of Mudslides on Wildfire-affected Slopes
    Tomac, Ingrid ;
    Chaves de Rosas, Jonathon
    2022-09-01 | PDF
    Wildfires in California have increased due to climate change, poor forests maintenance, and human factors. Post-wildfire mudflows frequently occur during rain events on burn scars due to loss of vegetation, change of surface morphology, and soil surface hydrophobicity. Spreading Xanthan gum biopolymer on slopes after wildfires may mitigate the risk ...
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