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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 1261 - 1280 of 35448 results
  • Daytime Lighting in Short Tunnels
    Daytime Lighting in Short Tunnels
    Yang, Jidong J ;
    Yee, Tien
    2023-12-01 | PDF
    Daytime lighting is warranted when natural sunlight fails to provide sufficient visibility for tunnel users. According to the American Association of State Highway Transportation Officials (AASHTO) Roadway Lighting Design Guide, no supplemental lighting is required if the tunnel is less than 80 ft in length, whereas supplemental lighting is needed ...
  • Effectiveness of ITS on Utah Roadways
    Effectiveness of ITS on Utah Roadways
    Schultz, Grant G. ;
    Davis, Matthew C
    2023-12-01 | PDF
    This report presents the findings of a comprehensive research study conducted for the Utah Department of Transportation (UDOT) to evaluate the effectiveness of commonly deployed Intelligent Transportation System (ITS) treatments in Utah, with a focus on Variable Message Signs (VMS), traffic cameras, and Road Weather Information System(s) (RWIS) sit ...
  • Guidelines for the Implementation of a Statewide ATSPM System
    Guidelines for the Implementation of a Statewide ATSPM System
    Sunkari, Srinivasa R ;
    Chaudhary, Nadeem
    2023-12-01 | PDF
    Agencies that operate traffic signals now have an emerging tool to help them succeed in their day-to-day operations. The availability of high-resolution traffic signal data along with analysis tools has enabled these agencies to troubleshoot problems very quickly before they escalate into bigger issues and to maintain and update signal timings in a ...
  • 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 ...
  • Production of CastinPlace UHPC for Bridge Applications
    Production of Cast-in-Place UHPC for Bridge Applications
    Hu, Jiong ;
    Morcous, George
    2023-12-01 | PDF
    This project presents a comprehensive overview of the essential aspects associated with the cast-in-place application of UHPC, including formwork requirements, surface preparation, mixing procedures, placing methods, curing techniques, grinding specifications, and mockup construction. Each section provides in-depth insights into specific guidelines ...
  • Performance Monitoring of Olmsted CR 117 and 104 and Aggregate Base Material Update
    Performance Monitoring of Olmsted CR 117 and 104 and Aggregate Base Material Update
    Hoegh, Kyle
    2023-12-01 | PDF
    A performance monitoring and forensic study was conducted on several test sections with varying base and pavement characteristics. This report includes the performance data from the current phase, which was extended until pavement reconstruction, with the previously reported data, collected since original construction of the test sections. Each of ...
  • 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.
  • Inspection of Flexible Filler Tendons
    Inspection of Flexible Filler Tendons
    Brown, Jeff R. ;
    Su, Dan
    2023-12-01 | PDF
    This research focused on developing an inspection protocol for post-tensioning (PT) ducts employing flexible filler materials for corrosion protection in bridge applications. Historically, cementitious grouts (CG) have been used to provide corrosion protection and bonding in PT systems. In contrast, flexible filler systems use wax or grease to main ...
  • Leading Indicators of Transportation Equity Equity in Planning
    Leading Indicators of Transportation Equity: Equity in Planning
    Lewis, Elyse O ;
    Gordon, Bethany M
    2023-12-01 | PDF
    This report was commissioned as part of the Washington Department of Transportation’s (WSDOT) Equity in Planning (EiP) project. It presents knowledge drawn from the transportation equity academic literature, practice-oriented literature, community engagement, geospatial (GIS) analysis, and a survey of planning professionals. The project aims to com ...
  • Development of Improved Redundancy Measure for the Colorado State Highway System
    Development of Improved Redundancy Measure for the Colorado State Highway System
    Jia, Gaofeng ;
    Bui, Kenny
    2023-12-01 | PDF
    The Colorado Department of Transportation (CDOT) has been working to improve the resiliency of its transportation system and facilities. A vital attribute of a resilient transportation system is whether the system has redundancies built into it. For example, if a roadway is closed to traffic, but there are alternative routes for the drivers to take ...
  • 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 ...
  • 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 ...
  • Regional Emergency Evacuation Analysis in Traffic With Connected and Autonomous Vehicles
    Regional Emergency Evacuation Analysis in Traffic With Connected and Autonomous Vehicles
    Lu, Pan ;
    Huang, Ying
    2023-12-01 | PDF
    In an ever-evolving world characterized by environmental challenges and technological advancements, the confluence of natural disasters, particularly increasing wildfire threats, and the role of connected and autonomous vehicles (CAVs) stands as a critical focal point for research and innovation. This study embarks on a comprehensive exploration of ...
  • 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 ...
  • 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 ...
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