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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 1441 - 1460 of 35865 results
  • Current Status of Transportation Data Analytics and Pilot Case Studies Using Artificial Intelligence AI
    Current Status of Transportation Data Analytics and Pilot Case Studies Using Artificial Intelligence (AI)
    Xie, Yuanchang ;
    Liu, Ruifeng
    2023-12-01 | PDF
    Data is becoming increasingly important for state Departments of Transportation (DOTs) in making strategic and day to- day decisions. This research offers a comprehensive review of both existing and emerging data sources for Transportation Systems Management and Operations (TSMO). It discusses and summarizes the pros and cons of each data source. A ...
  • Applying UAS LiDAR for Developing Small Project Terrain Models
    Applying UAS LiDAR for Developing Small Project Terrain Models
    Wood, Clinton M. ;
    Cothren, Jackson David
    2023-12-01 | PDF
    The work described in this report assessed the accuracy of using unmanned aerial systems (UAS) LiDAR on small bridge replacement projects, compared the accuracy of UAS LiDAR and conventional surveying techniques (global navigation satellite system real time kinematics and total station), and discussed the cost savings of different surveying methods ...
  • Unticketing An UpsideDown Approach to Speed Compliance
    Unticketing: An Upside-Down Approach to Speed Compliance
    Shaw, John W ;
    Litteral, Theresa
    2023-12-01 | PDF
    Although research and practical experience show that penalties and incentives are both powerful motivators of human behavior, past approaches for addressing speeding and other routine traffic violations have almost always been punitive. Intercepting traffic violators is labor-intensive, is risky in terms of officer safety, and can amplify pre-exist ...
  • Incorporating TimeDependent Data to Proactive Safety Management
    Incorporating Time-Dependent Data to Proactive Safety Management
    Pineda-Mendez, Raul ;
    Guo, Qiming
    2023-12-01 | PDF
    This study proposed a risk-based safety management framework to supplement the current crash-based safety management system. The proposed tool considers time-dependent factors (e.g., hourly traffic, speed features, weather conditions, signal controls) to help justify operational measures for safety improvements (e.g., variable message signs, variab ...
  • Deicing Field Trials Use of Locally Sourced Cheese Brine
    Deicing Field Trials – Use of Locally Sourced Cheese Brine
    Fay, Laura
    ORCID ICON IMG
    2023-12-01 | PDF
    Leprino Cheese Brine (LCB) was approved for use in field trials at two locations in Colorado as a pre-wetting agent added to solid material (salt-sand or rock salt) at 8 gal/ton. Three attempts were made to pick up and then apply the LCB as a pre-wetting agent. While one successful pick up and application occurred, it was not as a pre-wet. The two ...
  • Evaluating Road Resilience to Wildfires Case Studies of Camp and Carr Fires
    Evaluating Road Resilience to Wildfires: Case Studies of Camp and Carr Fires
    Nassiri, Somayeh ;
    Butt, Ali Azhar
    2023-12-01 | PDF
    Between 2017 and 2018, California experienced four devastating fires, including the Camp and Carr Fires. After fires, road infrastructure is crucial for safe removal of hazardous materials and waste to landfills and recycling facilities. Despite the critical role of pavements in this process, there has been little quantitative evaluation of the pot ...
  • 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 ...
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