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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 3421 - 3440 of 36151 results
  • Evaluation and Enhancement of the Florida Statewide Model Deliverable 6 Final Report
    Evaluation and Enhancement of the Florida Statewide Model: Deliverable 6 –Final Report
    Lee, Ming ;
    Li, Chen
    2021-08-01 | PDF
    This project developed a roadmap for future model enhancements of the Florida Statewide Model (FLSWM) in light of emerging planning issues and proposed enhancement strategies incorporating advanced demand modeling techniques. The roadmap was developed with accomplishment of three tasks: literature review, model evaluation with scenario analysis, an ...
  • Data Fusion for Nonmotorized Safety Analysis
    Data Fusion for Nonmotorized Safety Analysis
    Sener, Ipek N. ;
    Munira, Silvy
    2021-08-01 | PDF
    This project explored an emerging research territory, the fusion of nonmotorized traffic data for estimating reliable and robust exposure measures. Fusion mechanisms were developed to combine five bike demand data sources in Austin, Texas, and the fused estimate was applied in two crash analyses. The research was divided into three sequential stage ...
  • Capacity and Cost Benefits of Super 2 Corridors
    Capacity and Cost Benefits of Super 2 Corridors
    Brewer, Marcus A. ;
    Barrette, Timothy D
    2021-08-01 | PDF
    Super 2 corridors with passing lanes provide operational benefits to traditional two-lane highways by creating passing opportunities and reducing delay and crashes, leading to increased use of Super 2 corridors across Texas. However, as more passing lane length is added to a Super 2 corridor, the more it may resemble a traditional four-lane alignme ...
  • Using Topic Modeling To Identify Public Opinion on Public Transportation During the COVID19 Pandemic
    Using Topic Modeling To Identify Public Opinion on Public Transportation During the COVID-19 Pandemic
    Taleqani, Ali Rahim ;
    Ezekwem, Kenechukwu
    2021-08-01 | PDF
    This study examines public opinion toward transit during the COVID-19 pandemic. This was accomplished through topic modeling using social media posts on Twitter. Results showed how discussion regarding public transit changed during the first several months of 2020. This study also shared lessons learned while developing the problem statement and me ...
  • Impact of COVID19 on Disadvantaged Business Enterprises in Minnesota
    Impact of COVID-19 on Disadvantaged Business Enterprises in Minnesota
    Gaidzanwa, Moira ;
    Stewart, Rebecca
    2021-08-01 | PDF
    Minnesota’s Office of Civil Rights at the Minnesota Department of Transportation administers the Disadvantaged Business Enterprise (DBE) program. The DBE program is intended to remedy past and current discrimination against disadvantaged business enterprises, ensure a level playing field and foster equal opportunity in DOT-assisted contracts, impro ...
  • Seasonal Use of Ohio Department of Transportation Bridges by Bats
    Seasonal Use of Ohio Department of Transportation Bridges by Bats
    Environmental Solutions & Innovations, Inc.  ...
    2021-08-01 | PDF
    The Ohio Department of Transportation (ODOT) is required to inspect bridge structures for presence of bats prior to repair, maintenance, or removal. Many bridges inspected do not contain bats, but evidence of bat presence can result in project delays, added costs, and increased impacts to listed species. This study aimed to facilitate understanding ...
  • Exploration of CorridorBased Tolling Strategies for Virginias Express Toll Lanes
    Exploration of Corridor-Based Tolling Strategies for Virginia’s Express Toll Lanes
    Zhu, Shanjiang ;
    Cetin, Mecit
    2021-08-01 | PDF
    Virginia has invested significant resources in the development of express toll lanes (ETLs), which adjust toll rates dynamically based on the level of toll lane usage. A tool is needed to investigate the potential impact of the I-66 Outside-the-Beltway (OTB) ETLs on regional traffic patterns. This study developed a microscopic traffic simulation mo ...
  • How do Environmental Factors Affect Drivers Gaze and Head Movements
    How do Environmental Factors Affect Drivers’ Gaze and Head Movements?
    Tavakoli, Arash ;
    Balali, Vahid
    2021-08-01 | PDF
    Studies have shown that environmental factors affect driving behaviors. For instance, weather conditions and the presence of a passenger have been shown to significantly affect the speed of the driver. As one of the important measures of driving behavior is the gaze and head movements of the driver, such metrics can be potentially used towards unde ...
  • Evaluation of LongTerm Impacts of Early Opening of Concrete Pavements
    Evaluation of Long-Term Impacts of Early Opening of Concrete Pavements
    Khazanovich, Lev ;
    Kosar, Katelyn
    2021-08-01 | PDF
    Due to an increase in demand to shorten construction time as much as possible, the purpose of this project was to determine the optimum strength for concrete pavement before opening it to traffic and without jeopardizing long-term performance. Six test cells in MnDOT’s MnROAD project were constructed in 2017 with varying degrees of early loading. V ...
  • Technical and Financial Feasibility Study for Installation of Solar Panels at IDOTOwned Facilities
    Technical and Financial Feasibility Study for Installation of Solar Panels at IDOT-Owned Facilities
    Rusk, Todd ;
    Siegel, Ryan
    2021-08-01 | PDF
    The Smart Energy Design Assistance Center assessed the administrative, technical, and economic aspects of feasibility related to the procurement and installation of photovoltaic solar systems on IDOT-owned buildings and lands. To address administrative feasibility, we explored three main ways in which IDOT could procure solar projects: power purcha ...
  • Evaluation of Geosynthetics Use in Pavement Foundation Layers and Their Effects on Design Methods
    Evaluation of Geosynthetics Use in Pavement Foundation Layers and Their Effects on Design Methods
    Qamhia, Issam I. A. ;
    Tutumluer, Erol
    2021-08-01 | PDF
    This report presents findings of a research effort aimed at reviewing and updating existing Illinois Department of Transportation (IDOT) specifications and manuals regarding the use of geosynthetic materials in pavements. The project consisted of three tasks: evaluate current IDOT practice related to the use of geosynthetics; review research and st ...
  • Round Robin Testing Program for the Indirect Tensile Cracking Test at Intermediate Temperature Phase I
    Round Robin Testing Program for the Indirect Tensile Cracking Test at Intermediate Temperature: Phase I
    Habbouche, Jhony ;
    Boz, Ilker
    2021-08-01 | PDF
    The indirect tensile cracking test (referred to herein as “the IDT-CT”) was recommended for use in balanced mix design (BMD) specifications to address cracking susceptibility of dense-graded surface mixtures with A and D designations in Virginia. The test method for the IDT-CT, ASTM D8225-19, does not currently contain a precision statement for the ...
  • Guidance to Promote Family Rules and Workplace Policies to Reduce Cell Phone Use While Driving and Promote Engaged Driving
    Guidance to Promote Family Rules and Workplace Policies to Reduce Cell Phone Use While Driving and Promote Engaged Driving
    Otto, Jay ;
    Finley, Kari
    2021-08-01 | PDF
    Distracted driving is a significant contributing factor to motor vehicle crashes. Cultural-based strategies seek to change the behaviors of individuals by connecting their social identity to nested layers of relationships. Relationships between family members or between supervisors and employees provide opportunities to reduce distracted driving. T ...
  • Development of A Safe Profitable and Fair Robotaxi Deployment Strategy
    Development of A Safe, Profitable, and Fair Robotaxi Deployment Strategy
    Zhao, Ding ;
    Huang, Peide
    2021-08-01 | PDF
    The deployment of autonomous vehicles (AVs) has been troubled by the soaring cost of operations and the public’s concerns about the safety and fairness issues potentially brought by the new mobility. As leading companies such as Waymo and Uber which have obtained permits to commercialize their robotaxi fleets domestically and overseas, it is urgent ...
  • Evaluation of New Asphalt Concrete Job Mix Formula Specifications
    Evaluation of New Asphalt Concrete Job Mix Formula Specifications
    Underwood, B. Shane ;
    Castorena, Cassandra
    2021-08-01 | PDF
    The North Carolina Department of Transportation (NCDOT) modified the procedures for asphalt mixture design in 2018 in part, to increase the asphalt content and address observed cracking issues with asphalt mixtures. These changes have reduced the number of asphalt mixture types, changed compaction levels and the volumetric limits for some mixtures, ...
  • Evaluating the Safety Cultures of KYTC Maintenance Crews
    Evaluating the Safety Cultures of KYTC Maintenance Crews
    Ammar, Ashtarout ;
    Al-shabbani, Zamaan
    2021-08-01 | PDF
    Highway work zones can be dangerous and unpredictable. Between 2003 and 2017, over 1,800 workers died on road construction sites. Eliminating injuries and deaths requires state transportation agencies to adopt robust safety cultures as there is a clear relationship between these cultures and worker behaviors. The Kentucky Transportation Cabinet (KY ...
  • Design of Microsurfacing and Chip Seal Mixes With RAP for Local Roadway Applications
    Design of Microsurfacing and Chip Seal Mixes With RAP for Local Roadway Applications
    Robbins, Mary ;
    Green, Roger
    2021-08-01 | PDF
    As aggregate resources are depleted, there is a need to turn to more sustainable resources and alternatives to virgin aggregate for pavement preservation treatments. A recent NAPA survey (Williams et al., 2019) shows more RAP is stockpiled in Ohio than any other state, with a total of 11.2 million tons of RAP in 2018. Given the large quantities of ...
  • Smart RightofWay Permitting System for the City of Pittsburgh Coordination Pricing and Enforcement
    Smart Right-of-Way Permitting System for the City of Pittsburgh: Coordination, Pricing and Enforcement
    Qian, Sean ;
    Ma, Wei
    2021-08-01 | PDF
    Public roads, streets, and sidewalks are managed by the City of Pittsburgh and those public space are used by all residents. The Department of Mobility and Infrastructure (DOMI) is responsible for issuing and enforcing permits for occupancy of the public right-of-way (ROW) in the City of Pittsburgh, such as for construction projects and utility lin ...
  • All Is Not LOST Tracking Californias Local Option Sales Tax Revenues for Transportation During the Pandemic
    All Is Not LOST: Tracking California’s Local Option Sales Tax Revenues for Transportation During the Pandemic
    King, Hannah ;
    Amberg, Natalie
    2021-08-01 | PDF
    The COVID-19 pandemic dramatically affected transportation systems, including the ability of localities to pay for them. The authors explore the effects of the pandemic and the associated economic turbulence on local option sales taxes (LOSTs), an increasingly common revenue source for transportation in California and across the U.S. LOSTs have man ...
  • Development of an Intelligent Snowplow Truck that Integrates Telematics Technology Roadway Sensors and Connected Vehicle
    Development of an Intelligent Snowplow Truck that Integrates Telematics Technology, Roadway Sensors, and Connected Vehicle
    Mahlberg, Justin ;
    Zhang, Yaguang
    2021-08-01 | PDF
    The Indiana Department of Transportation (INDOT) manages and maintains over 28,000 miles of roadways. Maintenance of the roadways includes pavement repair in the summer and snow removal and de-icing in the winter. The prioritization of assets during winter storm events is crucial and impacts travel and safety. The objective of this project was to i ...
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