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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 3381 - 3400 of 36151 results
  • 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 ...
  • Illinois Highway Materials Sustainability Efforts 2020
    Illinois Highway Materials Sustainability Efforts 2020
    Morse, Kelly L.
    2021-08-23 | PDF
    The Illinois Department of Transportation (IDOT) continues to use a variety of reclaimed and recycled materials in highway construction. Recycled materials are used in highway construction to supplement aggregates, concrete, hot-mix asphalt (HMA), steel, and sealants, as well as for soil modification and pavement markings. This report summarizes th ...
  • Evaluating SystemLevel Impacts of Innovative Truck Routing Strategies
    Evaluating System-Level Impacts of Innovative Truck Routing Strategies
    Boriboonsomsin, Kanok ;
    Hao, Peng
    2021-08-15 | PDF
    Heavy-duty diesel trucks (HDDTs) are significant contributors of fine particulate matter (PM2.5) and nitrogen oxides (NOx) emissions. As a result, communities with a large amount of truck traffic often experience elevated levels of diesel-related air pollution. One strategy for mitigating the air pollution impacts of truck traffic, called low expos ...
  • Effectiveness of Crash FactSafety Message Signs on Dynamic Message Signs
    Effectiveness of Crash Fact/Safety Message Signs on Dynamic Message Signs
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2021-08-11 | PDF
    From 2010 to 2020, transportation agencies have increasingly used roadside dynamic message signs (DMS) to display safety messages. Despite their widespread use, evaluations as to potential impacts on driver behavior, and the resultant impacts on traffic crashes has been very limited. This study evaluated the use of DMS to display safety messages le ...
  • Slope Restoration on Urban Freeways
    Slope Restoration on Urban Freeways
    Cregg, Bert ;
    Schutzki, Robert
    2021-08-11 | PDF
    Diverse plantings along freeway roadsides can be beneficial to surrounding areas in many ways, such as improved driver safety, increased biodiversity, and improved aesthetics. Unfortunately, establishing these plantings can be difficult for a variety of reasons. To improve the success of future plantings, the authors investigated the impacts of sit ...
  • Connected Vehicle Pilot Deployment Program Phase 1 Concept of Operations ConOps New York City
    Connected Vehicle Pilot Deployment Program Phase 1, Concept of Operations (ConOps) - New York City
    Galgano, Steve ;
    Talas, Mohamad
    2021-08-04 | PDF
    This document describes the Concept of Operations (ConOps) for the New York City Department of Transportation (NYC) Connected Vehicle Pilot Deployment (CVPD) Project. This ConOps describes the current state of operations, establishes the reasons for change, and defines the future system in terms of functions/features and supporting operations. It i ...
  • Phase 1 Concept of Operations ConOps Heart of Iowa Regional Transit Agency ITS4US Deployment Project
    Phase 1 Concept of Operations (ConOps): Heart of Iowa Regional Transit Agency ITS4US Deployment Project
    Mishra, Santosh ;
    Wilks, Steve
    2021-08-04 | ITS4US Phase 1 | PDF
    The Concept of Operations (ConOps) document will serve as the guiding document for the Health Connector Phase 1 planning activities, and subsequent deployment and operations and maintenance (O&M) activities in Phases 2 and 3. This document will be used to communicate overall quantitative and qualitative system characteristics to the end user, devel ...
  • Connected Vehicle Pilot Deployment Program Phase 1 System Requirements Specification SyRS New York City
    Connected Vehicle Pilot Deployment Program Phase 1, System Requirements Specification (SyRS) – New York City.
    Galgano, Steve ;
    Talas, Mohamad
    2021-08-04 | PDF
    This document describes the System Requirements Specification (SyRS) for the New York City Department of Transportation (NYC) Connected Vehicle Pilot Deployment (CVPD) Project. This SyRS describes the results of the definition of need, the operational concept, and system analysis tasks. It also conveys the requirements that are geared towards satis ...
  • Evaluation of Advanced Communication Technologies Through Traffic Microsimulation
    Evaluation of Advanced & Communication Technologies Through Traffic Microsimulation
    Manjunatha, Pruthvi ;
    Elefteriadou, Lily
    2021-08-02 | PDF
    Evaluation of VISSIM revealed that internal modeling of CAV has several limitations. For external modeling, two VISSIM interfaces are useful. The Component Object Model (COM)Application Programming Interface (API) is the superior approach for fetching data and modeling connectivity, whereas the External Driver Model (EDM) is a better tool for later ...
  • Impact of Smartphone Applications on Trip Routing
    Impact of Smartphone Applications on Trip Routing
    Guin, Angshuman ;
    Hadi, Mohammed
    2021-08-02 | PDF
    The Georgia Institute of Technology-led research evaluated trip re-routing potential of route guidance apps, how drivers utilized the information provided, and the impact of traffic re-routing on roadway facility usage, congestion, and prevailing speeds. Major findings of this study included a variety of characteristics associated with navigation a ...
  • US 160 Dry Creek Wildlife Study
    US 160 Dry Creek Wildlife Study
    Cramer, Patricia ;
    Hamlin, Robert
    2021-08-01 | PDF
    The study monitored the effectiveness of the CDOT US 160 Dry Creek Wildlife Mitigation Project, located between Durango and Bayfield in Southwest of Colorado. Mitigation included a wildlife crossing structure at mile post (MP) 97.42, wildlife exclusion fence on both sides of US 160 from MP 97.05 to MP 97.82, and two EnviroGrid® Geocell treatments p ...
  • Green Waves Machine Learning and Predictive Analytics Making Streets Better for People on Bikes
    Green Waves, Machine Learning, and Predictive Analytics: Making Streets Better for People on Bikes
    Fickas, Stephen
    ORCID ICON IMG
    2021-08-01 | PDF
    This project focuses on giving bicyclists a safer and more efficient path through a city’s signalized intersections. It builds on a prior NITC project that tested an app for a fixed-time corridor. The goal of this project is to lay the groundwork for extending this earlier app to include actuated signals. Two machine-learning algorithms are introdu ...
  • Analysis of the Georgia AddOn to the 20162017 National Household Travel Survey
    Analysis of the Georgia Add-On to the 2016–2017 National Household Travel Survey
    Kash, Gwen ;
    Mokhtarian, Patricia L.
    2021-08-01 | PDF
    Through an extensive analysis of the Georgia subsample of the 2016–2017 National Household Travel Survey, this report provides an in-depth snapshot of the travel behavior of Georgians of all ages. It documents differences in travel needs and behavior by region and between demographic groups, focuses on measurement challenges and improved techniques ...
  • Development of a Laboratory Testing Protocol To Evaluate Alternative Materials for Use in Modifying Asphalt Binders and Alternative Materials for Use in Modifying Asphalt Mixtures
    Development of a Laboratory Testing Protocol To Evaluate Alternative Materials for Use in Modifying Asphalt Binders and Alternative Materials for Use in Modifying Asphalt Mixtures
    Karki, Pravat ;
    Zhou, Fujie
    2021-08-01 | PDF
    The objectives of this project were to develop separate approval protocols for alternative asphalt binder additives and alternative asphalt mixture additives. To develop these protocols, PG 76-22 (PMA) binder and its Superpave 12.5-mm mix with granite (i.e., control binder and mixture) and two alternatively modified asphalt PG 76-22 binders and the ...
  • Alternate Reinforcements for Enhanced Corrosion Resistance in TxDOT Bridges
    Alternate Reinforcements for Enhanced Corrosion Resistance in TxDOT Bridges
    Lute, Racheal D ;
    Folliard, Kevin J.
    2021-08-01 | PDF
    The corrosion of reinforcing steel in concrete is the leading cause of deterioration for reinforced concrete structures, especially bridges exposed to external chlorides. Practitioners and researchers have evaluated and implemented various technologies to combat this problem, including the use of high-performance concrete, chemical corrosion inhibi ...
  • Multimodal Connected Vehicle Pilot for Winter Travel
    Multimodal Connected Vehicle Pilot for Winter Travel
    Dey, Kakan ;
    Shi, Xianming
    2021-08-01 | PDF
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