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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 1281 - 1300 of 35448 results
  • Rapid Safety Assessment Tool for NonConventional Roadway Designs and Emerging Technologies Innovative Artificial Intelligence Application
    Rapid Safety Assessment Tool for Non-Conventional Roadway Designs and Emerging Technologies: Innovative Artificial Intelligence Application
    Ahmed, Mohamed ;
    Mohamed, Ahmed
    2023-12-01 | PDF
    Traditional safety assessment methodologies are profoundly dependent on reactive crash data. The Highway Safety Manual (HSM) approach recommends 3-5 worth of crash data before and after the implementation of safety countermeasures. Waiting for such a long period of time might not be feasible to address safety issues at various roadway facilities. F ...
  • Automated RealTime Weather Detection System Using Artificial Intelligence
    Automated Real-Time Weather Detection System Using Artificial Intelligence
    Ahmed, Mohamed M ;
    Khan, Md Nasim
    2023-12-01 | PDF
    Adverse weather conditions have long been recognized as a leading contributing factor to motor vehicle crashes, primarily due to their adverse effects on visibility and road surfaces. Providing drivers with real-time weather information is essential to ensure safe driving in adverse weather conditions. Nonetheless, the identification of road weathe ...
  • Effective Management and Emerging Best Practices of Geotechnical and Utilities Risks in Alternate Delivery
    Effective Management and Emerging Best Practices of Geotechnical and Utilities Risks in Alternate Delivery
    Ashuri, Baabak ;
    Macedo, Jorge
    2023-12-01 | PDF
    In recent decades, state transportation authorities (STAs) such as the Georgia Department of Transportation (GDOT) have increasingly relied upon alternative contracting methods (ACMs) to deliver complex surface transportation infrastructure projects. ACM delivery allocates greater levels of responsibility to the private sector for the completion of ...
  • Development of Approach Transition From Box Beam Guardrail to Concrete Parapet
    Development of Approach Transition From Box Beam Guardrail to Concrete Parapet
    Bligh, Roger P. ;
    Sheikh, Nauman M.
    2023-12-01 | PDF
    This research is a step in the Wyoming Department of Transportation’s ongoing efforts to implement the Manual for Assessing Safety Hardware (MASH) to enhance roadside safety and reduce the severity of run-off-road crashes. The objective of this research was to develop a MASH Test Level 3 (TL-3) compliant stiffness transition from box beam roadside ...
  • Evaluation of Recycled Components in Stone Matrix Asphalt Mixes
    Evaluation of Recycled Components in Stone Matrix Asphalt Mixes
    Buttlar, William G. ;
    Abdelrahman, Magdy
    2023-12-01 | PDF
    Currently, Missouri DOT (MoDOT) does not allow use of recycled materials in SMAs. MoDOT commissioned this study to investigate the effect of incorporation of recycled materials such as RAP and GTR in SMAs. In Phase 1, plant-produced mixtures were collected, and recreated under BMD methodology to determine acceptable upper-limit on RAP for initial i ...
  • Development of a SmartphoneBased Road Performance Data Collection Tool
    Development of a Smartphone-Based Road Performance Data Collection Tool
    Yang, Bo ;
    Jiao, Yueyi
    2023-12-01 | PDF
    Pavement roughness serves as a critical indicator of the overall ride quality of road surfaces. Elevated levels of pavement roughness can give rise to concerns regarding driving safety, fuel consumption, and exhaust gas emissions. The International Roughness Index (IRI) stands as the globally accepted standard for quantifying road surface roughness ...
  • Evaluation of Otta Seal Surfacing for LowVolume Roads in Iowa Phase II Study Comprehensive Laboratory Evaluation and Characterization and FullScale Field Implementation
    Evaluation of Otta Seal Surfacing for Low-Volume Roads in Iowa, Phase II Study: Comprehensive Laboratory Evaluation and Characterization and Full-Scale Field Implementation
    Jibon, Md ;
    Yang, Bo
    2023-12-01 | PDF
    Iowa has over 110,000 miles of roads, and they frequently support local residential vehicles as well as heavy trucks. Traditional bituminous surface treatments (BST) could be employed to maintain these roads properly, but these treatments typically require high-quality materials and standard construction equipment. Otta seal is a relatively new BST ...
  • Development of a SmartphoneBased Road Performance Data Collection Tool Tech Transfer Summary
    Development of a Smartphone-Based Road Performance Data Collection Tool [Tech Transfer Summary]
    Ceylan, Halil ;
    Kim, Sunghwan
    2023-12-01 | PDF
    This study aimed to develop a smartphone-based system for collecting pavement roughness data in Iowa.
  • Chip Seal Quality Assurance Using Percent Embedment
    Chip Seal Quality Assurance Using Percent Embedment
    Alhasan, Ahmad ;
    Moon, Brian
    2023-12-01 | PDF
    This study investigates the use of macrotexture as an indicator of the percent embedment (PE) of aggregate in a chip seal and ultimately, as a quality assurance tool for chip seals. The study included an extensive field- and controlled-testing program from 24 chip seal sections constructed in Illinois. Surface texture measurements were acquired usi ...
  • Understanding the Effect of Pervasive Events on Vehicle Travel Time Patterns
    Understanding the Effect of Pervasive Events on Vehicle Travel Time Patterns
    Akbari, Chirag ;
    Gore, Ninad
    2023-12-01 | PDF
    The COVID-19 pandemic has disrupted daily activities and travel patterns, affecting personal and commercial trips. This study investigates the effect of different stages of the pandemic on travel time patterns. Eighty-six geographically distributed links (sections of road) in Mecklenburg County and Buncombe County, North Carolina, were selected for ...
  • Electrified Barriers Installed on Top of Wildlife Guards To Help Keep Large Wild Mammals out of a Fenced Road Corridor
    Electrified Barriers Installed on Top of Wildlife Guards To Help Keep Large Wild Mammals out of a Fenced Road Corridor
    Huijser, Marcel P. ;
    Getty, Samantha C
    2023-12-01 | PDF
    Most wildlife mitigation measures along highways are aimed at improving human safety, reducing direct wildlife mortality, and providing safe crossing opportunities for wildlife. Fences in combination with wildlife crossing structures are the most effective combination of mitigation measures to achieve these objectives. For fences to reliably reduce ...
  • Evaluation of Otta Seal Surfacing for LowVolume Roads in Iowa Phase II Study Comprehensive Laboratory Evaluation and Characterization and FullScale Field Implementation Tech Transfer Summary
    Evaluation of Otta Seal Surfacing for Low-Volume Roads in Iowa, Phase II Study: Comprehensive Laboratory Evaluation and Characterization and Full-Scale Field Implementation [Tech Transfer Summary]
    Ceylan, Halil ;
    Kim, Sunghwan
    2023-12-01 | PDF
    This study aimed to evaluate the performance of Otta seal in Iowa through laboratory and field investigations and to establish recommended specifications for Otta seal implementation.
  • Investigating Statewide Transit Maintenance Needs in Illinois
    Investigating Statewide Transit Maintenance Needs in Illinois
    Light, Ethan ;
    Sai, Shang
    2023-12-01 | PDF
    This study’s researchers investigated transit vehicle maintenance processes, maintenance needs, and potential opportunities associated with building additional bus maintenance facilities (e.g., regional maintenance centers) in Illinois. They collected information via three main tasks. First, they conducted a literature review to document practices ...
  • A Comparison of Service Life Models for Concrete Corrosion Durability
    A Comparison of Service Life Models for Concrete Corrosion Durability
    Khan, Zafrul H. ;
    Alhasan, Ahmad
    2023-12-01 | PDF
    This study compares the service life models of concrete structures against chloride-induced corrosion. Empirical, stochastic, and mechanistic-based service life models were studied. Two popular mechanistic service life models, Life-365 and fib Bulletin 34, were further evaluated. From the design of experiment and statistical analysis, the important ...
  • Evaluation of Corrosion Prevention and Mitigation Approaches Used on Texas Bridges Project Summary
    Evaluation of Corrosion Prevention and Mitigation Approaches Used on Texas Bridges [Project Summary]
    Hurlebaus, Stefan ;
    Birely, Anna
    2023-11-30 | PDF
    The researchers created and validated a Texas corrosion risk assessment map (Figure 1) based on corrosion modeling in which Region 1 corresponds to a low risk of corrosion and Region 6 corresponds to a high risk of corrosion. To assess corrosion prevention and mitigation techniques applied on steel and concrete bridges, over 100 bridges were inspec ...
  • Users Guide for SAM AV Module Guide for the Texas Statewide Analysis Model with Autonomous Vehicles SharedAutonomous Vehicles Autonomous Trucks
    User’s Guide for SAM AV Module: Guide for the Texas Statewide Analysis Model with Autonomous Vehicles, Shared-Autonomous Vehicles & Autonomous Trucks
    Kockelman, Kara ;
    Vellimana, Maithreyi
    2023-11-30 | PDF
    This document serves as a comprehensive guide on how to use the SAM AV Module within the context of the 5-7081-01 implementation project. This module is a variation SAM-V4 model (Statewide Analysis Model) modified to include autonomous vehicles (AVs), shared autonomous vehicles (SAVs) and autonomous trucks (ATrucks). This project introduces autonom ...
  • Develop Design of HotMix ColdLaid Mixtures with the Superpave Gyratory Compactor Project Summary
    Develop Design of Hot-Mix Cold-Laid Mixtures with the Superpave Gyratory Compactor [Project Summary]
    Zhou, Fujie ;
    Chan, Kin Ming
    2023-11-30 | PDF
    The objective of this project was to establish a new HMCL mix design method with an SGC and new performance tests, ensuring high-quality and long-lasting HMCL mixes.
  • CostBenefit Analysis for Concrete vs Metal Guardrails and Wood vs Metal Posts for Signs and Guardrails
    Cost-Benefit Analysis for Concrete vs. Metal Guardrails and Wood vs. Metal Posts for Signs and Guardrails
    Estahbanati, Alireza Nemati ;
    Nazari, Shima
    2023-11-29 | PDF
    This research was conducted to analyze the lifetime costs associated with concrete barriers, steel guardrails, and wooden versus metal guardrail posts and signposts. In this study, a comprehensive lifecycle cost analysis and cost-benefit evaluation framework was developed that can be used to facilitate decision making processes to mitigate safety r ...
  • Integrating Autonomous Cars Trucks into TxDOTs Statewide Analysis Model Training Webinar Nov 29 2023
    Integrating Autonomous Cars & Trucks into TxDOT’s Statewide Analysis Model [Training Webinar: Nov 29, 2023]
    Kockelman, Kara ;
    Vellimana, Maithreyi
    2023-11-29 | PDF
    Integrating Autonomous Cars and Trucks into TxDOT's Statewide Analysis Model Training Webinar Nov 29, 2023.
  • Pilot Testing of Work Zone Intrusion Alarms
    Pilot Testing of Work Zone Intrusion Alarms
    Khan, Ghazan ;
    Cochrane, Raven
    2023-11-16 | PDF
    The main goal for this research was to evaluate the effectiveness and practicality of deploying and operating selected WZIA systems in California work zones. The objective was to provide recommendations and guidance to Caltrans on implementing such systems in real-world conditions through field observations and feedback provided by the Caltrans mai ...
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