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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 1521 - 1540 of 36104 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 ...
  • 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 ...
  • Regional Emergency Evacuation Analysis in Traffic With Connected and Autonomous Vehicles Research Brief
    Regional Emergency Evacuation Analysis in Traffic With Connected and Autonomous Vehicles [Research Brief]
    Lu, Pan ;
    Huang, Ying
    2023-12-01 | PDF
    Researchers focused on three research issues: 1) predicting and making recommendations for future evacuations under wildfire conditions using connected vehicle data, 2) driving behaviors in wildfire evacuations, and 3) autonomous vehicle perceptions in winter conditions. This research addresses the urgent need for enhanced emergency evacuation stra ...
  • 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 ...
  • 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 ...
  • Integrating Human Behavior Toward the Development of Safer Cooperative Automated Transportation Implementation of SHRP2 Naturalistic Driving Study
    Integrating Human Behavior Toward the Development of Safer Cooperative Automated Transportation: Implementation of SHRP2 Naturalistic Driving Study
    Ahmed, Mohamed ;
    Das, Anik
    2023-12-01 | PDF
    Cooperative Automated Transportation (CAT), encompassing Connected Vehicles (CV), Autonomous Vehicles (AV), and Connected and Automated Vehicles (CAV), represents a transformative shift in the transportation landscape. CAT offers benefits such as improved safety, reduced congestion, enhanced traffic operations, increased productivity, and environme ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Review of Illinois Multiple Stress Creep and Recovery Data for Future Implementation
    Review of Illinois Multiple Stress Creep and Recovery Data for Future Implementation
    Hajj, Ramez ;
    Asadi, Babak
    2023-12-01 | PDF
    The multiple stress creep recovery (MSCR) test, per AASHTO M 332, or as a supplement to M 320, has been widely implemented across the United States and in other parts of the world for assessing the rutting resistance of asphalt binder. Meanwhile, the Illinois Department of Transportation (IDOT) has conducted wide-ranging MSCR testing since 2006 but ...
  • 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 ...
  • Characterization of Concrete Creep and Shrinkage of the Birmingham I59I20 Segmental Bridge
    Characterization of Concrete Creep and Shrinkage of the Birmingham I-59/I-20 Segmental Bridge
    Beauchamp, Paul S ;
    Cooper, Grant M
    2023-12-01 | PDF
    The objective of this study is to accurately predict the creep and shrinkage behavior of concrete in the I-59/I-20 segmental bridge located in downtown Birmingham, Alabama. Concrete samples were collected on four sampling dates throughout the bridge’s construction for creep and shrinkage testing. Concrete specimens were loaded at 7, 28, 91, and 182 ...
  • 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.
  • Standardizing Environmental DNA Methodologies for Coho Salmon
    Standardizing Environmental DNA Methodologies for Coho Salmon
    Kinziger, Andrew ;
    Bjorkstedt, Eric
    2023-12-01 | PDF
    The California Department of Transportation (Caltrans) is mandated to conduct Federal Endangered Species Act (FESA) Section 7 and California Endangered Species Act (CESA) consultations for projects potentially impacting federally and state-listed species. Coho salmon (Oncorhynchus kisutch), listed under both FESA and CESA, require precise data on p ...
  • Performance and Improvement of Texas Poor Boy Continuous Bridge Deck Details Project Summary Report
    Performance and Improvement of Texas Poor Boy Continuous Bridge Deck Details [Project Summary Report]
    Birely, Anna C. ;
    Hurlebaus, Stefan
    2023-12-01 | PDF
    The project team first investigated the performance of PBJs on 468 existing bridges in northwest and east Texas with data gathered from design drawings and inspection reports. Researchers used non-destructive evaluation techniques on PBJs on eight bridges to evaluate construction practices and potential damage.
  • Construction of LowCracking HighPerformance Bridge Decks Incorporating New Technology Phase II Technical Summary
    Construction of Low-Cracking High-Performance Bridge Decks Incorporating New Technology Phase II: Technical Summary
    Bahadori, Alireza ;
    Darwin, David
    2023-12-01 | PDF
    The objective of this study is to investigate the cracking of concrete bridge decks employing internal curing. Concrete mixtures incorporating internal curing, used in conjunction with slag cement with or without small amounts of silica fume (as partial replacements of portland cement), are investigated based on construction observations and crack ...
  • Field Implementation of Concrete Strength Sensor to Determine Optimal Traffic Opening Time
    Field Implementation of Concrete Strength Sensor to Determine Optimal Traffic Opening Time
    Kong, Zhihao ;
    Lu, Na (Luna)
    2023-12-01 | PDF
    In the fast-paced and time-sensitive fields of construction and concrete production, real-time monitoring of concrete strength is crucial. Traditional testing methods, such as hydraulic compression (ASTM C 39) and maturity methods (ASTM C 1074), are often laborious and challenging to implement on-site. Building on prior research (SPR-4210 and SPR-4 ...
  • Annual North Dakota Elevator Marketing Report 20222023
    Annual North Dakota Elevator Marketing Report, 2022–2023
    Vachal, Kimberly ;
    Andersen, Jaclyn
    2023-12-01 | PDF
    The objective of this report is to provide a benchmark for elevator managers in assessing performance and supply a source for recognizing trends in the characteristics of North Dakota elevators. This report and the statistics mailed to individual elevators are presented as a source of information for elevator managers and those interested in the No ...
  • An Investigation into Expansion Joint Movement for Integral Abutment Concrete Bridges
    An Investigation into Expansion Joint Movement for Integral Abutment Concrete Bridges
    Greenwood, Aaron T. ;
    Atadero, Rebecca
    2023-12-01 | PDF
    Expansion joints on bridge structures allow for essential thermal movements of structural components but often at the cost of regular maintenance and periodic replacement to counter damage the joint may experience throughout its lifecycle. This project was conducted to study the potential for eliminating or removing expansion joints for one of the ...
  • 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 ...
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