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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 3301 - 3320 of 35958 results
  • 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
    No Description
  • Optimizing Design of GDOT Post Construction Stormwater BMPs for Performance While Minimizing RightofWay Acquisition and Peak Flows
    Optimizing Design of GDOT Post Construction Stormwater BMPs for Performance While Minimizing Right-of-Way Acquisition and Peak Flows
    Burns, Susan E
    ORCID ICON IMG
    2021-08-01 | PDF
    The objectives of this study were to evaluate the performance of stormwater best management practices (BMPs) used for stormwater quantity and quality control. Three field sites were tested to quantify hydraulic conductivity, infiltration, and solids removal efficiency. Removal efficiencies ranged from 12% to 35% of infiltrated runoff for VFS rangin ...
  • Determining Bond Strength of Microsurfacing Mixes Phase 2
    Determining Bond Strength of Micro-surfacing Mixes - Phase 2
    Nazzal, Munir D. ;
    Kim, Sang Soo
    2021-08-01 | PDF
    This report summarizes results of a project that was completed to determine the benefits and drawbacks of using tack coat in micro-surfacing applications and identify the tack coat application rate that will result in the optimum interface bond strength and better performance for micro-surfacing applications using different tack coat materials. The ...
  • Environmental Impacts of Short Car Trip Replacement with Micromobility Modes
    Environmental Impacts of Short Car Trip Replacement with Micromobility Modes
    Harper, Corey ;
    Fan, Zhufeng
    2021-08-01 | PDF
    Micromobility (defined as shared bikes, e-bikes and e-scooters) represent a significant opportunity to replace short distance trips made by personally owned vehicles (POVs) and provide first-and last-mile solutions for underserved public transit riders. This research develops a methodology for estimating the upper bound number of short-distance POV ...
  • AirportMPO Collaboration Challenges and Opportunities for Cooperative Megaregional Transportation Planning
    Airport-MPO Collaboration: Challenges and Opportunities for Cooperative Megaregional Transportation Planning
    Rahman, Mashrur ;
    Sciara, Gian Claudia
    2021-08-01 | PDF
    This study explores the challenges and opportunities that aviation market changes present for existing transportation governance structures and institutions. In particular, we examine the capacity of existing planning institutions–largely siloed in separate air and surface transport planning domains—to address the megaregional dynamics associated w ...
  • Development of Gyratory Stability Index to Evaluate Variation of RAP Content and Rutting Resistance of Asphalt Mixtures
    Development of Gyratory Stability Index to Evaluate Variation of RAP Content and Rutting Resistance of Asphalt Mixtures
    Kassem, Emad ;
    Bayomy, Fouad M. S.
    2021-08-01 | PDF
    ITD Research Report RP 175 developed an algorithm for determining a Gyratory Stability (GS) for asphalt mixtures based on the Servopac gyratory compactor. The GS describes the ability of asphalt mixtures to resist rutting, and it can be determined during the mix design stage using the gyratory compaction data. This study developed a modified algori ...
  • Constructing High Performance Asphalt Pavements by Improving in Place Pavement Density
    Constructing High Performance Asphalt Pavements by Improving in Place Pavement Density
    Kumar, Vikas ;
    Coleri, Erdem
    2021-08-01 | PDF
    Increasing the density of asphalt concrete materials is expected to result in significant economic and environmental benefits by increasing asphalt mix strength and reducing cracking and rutting. In addition, reduced air-void content is expected to reduce permeability and moisture-induced pavement damage. Reduced permeability is also expected to re ...
  • Green Charging of Electric Vehicles Under a NetZero Emissions Policy Transition in California
    Green Charging of Electric Vehicles Under a Net-Zero Emissions Policy Transition in California
    Jenn, Alan ;
    Brown, Austin
    2021-08-01 | PDF
    California has many aggressive climate policies, primarily aimed at individual sectors. This study explores untapped policy opportunities for interactions between sectors, specifically between the transportation and the electricity grid. As electric vehicles become more prevalent, their impact on the electricity grid is directly related to the aggr ...
  • Understanding Pedestrian Injuries and Social Equity
    Understanding Pedestrian Injuries and Social Equity
    Roll, Josh ;
    McNeil, Nathan
    2021-08-01 | PDF
    Past research and planning has highlighted the existence of pedestrian injury disparities throughout the US and some local agencies have performed cursory analysis in Oregon. However, no statewide analysis of pedestrian injuries in Oregon has been completed to see how these injury outcomes differ by race and income. This report aims to help better ...
  • Measuring Corrosion Conditions in Mechanically Stabilized Earth Walls
    Measuring Corrosion Conditions in Mechanically Stabilized Earth Walls
    Parsons, Robert ;
    Han, Jie
    2021-08-01 | PDF
    KDOT extensively utilizes mechanically stabilized earth (MSE) walls, typically with coarse aggregate backfill. Previous projects K-TRAN: KSU-15-6 and K-TRAN: KU-15-5 tested the aggregate material from MSE walls under construction. KU identified that several of the clean aggregate samples contained some fines, likely from crushing of the aggregate, ...
  • A Precast Pier System for Accelerated Bridge Construction ABC in Idaho
    A Precast Pier System for Accelerated Bridge Construction (ABC) in Idaho
    Mashal, Mustafa ;
    Acharya, Mahesh
    2021-08-01 | PDF
    Accelerated Bridge Construction (ABC) in seismic regions is currently a research focal point. ABC is bridge construction that uses innovative planning, design, materials, and construction methods in a safe and cost-effective manner to reduce the onsite construction time that occurs when building new bridges or replacing and rehabilitating existing ...
  • COVID19 Impacts on Speed and Safety for Minnesota Roads and Work Zones
    COVID-19 Impacts on Speed and Safety for Minnesota Roads and Work Zones
    Hawkins, Neal ;
    Hallmark, Shauna
    2021-08-01 | PDF
    Reduced traffic volumes resulting from COVID-19, along with the strain on enforcement during the pandemic, are thought to have produced higher speeds and more aggressive driving. Understanding the magnitude of speeding and other driver behaviors requires measurement and contrast. This project quantifies reductions in volume and the resulting differ ...
  • Reclaimed Stabilized Base Stabilizing Agent Selection and Design
    Reclaimed Stabilized Base: Stabilizing Agent Selection and Design
    Khorasani, Ali ;
    Ghazanfari, Ehsan
    2021-08-01 | PDF
    Reclaimed stabilized base (RSB) is a common technique utilized to rehabilitate roadways. RSB involves reclaiming the base material and adding a stabilizing agent to increase the strength and durability of the base/subbase structure. This technique involves pulverizing some of the existing pavement along with a portion of the underlying base materia ...
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