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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 1561 - 1580 of 36104 results
  • Construction of LowCracking HighPerformance Bridge Decks Incorporating New Technology Phase II
    Construction of Low-Cracking High-Performance Bridge Decks Incorporating New Technology Phase II
    Bahadori, Alireza ;
    Darwin, David
    2023-12-01 | PDF
    The construction, crack surveys, and evaluation of 12 bridge decks with internal curing provided by prewetted fine lightweight aggregate and supplementary cementitious materials following internally cured low-cracking high-performance concrete (IC-LC-HPC) specifications of Minnesota or Kansas are described, as well as those from two associated Cont ...
  • Interstate and Primary PCC Pavement Overlays Review
    Interstate and Primary PCC Pavement Overlays Review
    Hanson, Todd
    2023-12-01 | PDF
    Iowa has a long history of PCC pavement overlays. Several research projects were placed over the years, which led to a variety of different designs and features. The objective of this study was to perform a review of concrete overlays performance on the interstate and primary system and determine any best practices or lessons learned.
  • 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 ...
  • Implementation and Assessment of Highway Intrusion Technologies
    Implementation and Assessment of Highway Intrusion Technologies
    Hasanzadeh, Sogand ;
    Esmaeili, Behzad
    2023-12-01 | PDF
    Highway workers face dangers from distracted drivers and challenging work zones, which results in thousands of incidents annually in the U.S. Traditional safety measures, though beneficial, highlight a need for advanced intrusion alert technologies. While many state DOTs are exploring these technologies, research gaps persist regarding their effect ...
  • Driver Comprehension of Flashing Yellow Arrows
    Driver Comprehension of Flashing Yellow Arrows
    Davis, Gary A. ;
    Stern, Raphael
    2023-12-01 | PDF
    In 2009, the FHWA’s Manual on Uniform Traffic Control Devices (MUTCD) introduced the flashing yellow arrow (FYA) traffic signal as an alternative to circular green (CG) to indicate permitted left turns. The FYA is arguably a more intuitive indication that left turns are permitted but not protected and, in addition, the FYA signal heads can support ...
  • Safe Routes Utah Plans and Active Transportation Safety
    Safe Routes Utah Plans and Active Transportation Safety
    Burbidge, Shaunna K. ;
    Gee, Collin
    2023-12-01 | PDF
    The goal of Utah’s Safe Routes to School program is to “help children get to and from school safely” (UDOT, 2022). To that end, state law dictates that each school must maintain a safe routes map showing students the safest route to access the school from their homes. This research examined existing safe routes maps and investigated whether schools ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Granite Property Prebles Meadow Jumping Mouse Surveys Boulder Colorado
    Granite Property Preble’s Meadow Jumping Mouse Surveys, Boulder, Colorado
    Schorr, Robert
    2023-12-01 | PDF
    Preble’s meadow jumping mice (PMJM) are rare rodents found along creeks and waterways from southeastern Wyoming to Colorado Springs. In Colorado, PMJM are found in densely vegetation riparian corridors and wetlands along the Front Range. The biggest threat to populations is habitat conversion and alteration. Habitat regeneration and rehabilitation ...
  • INDOT Research Program Benefit Cost AnalysisReturn on Investment for Projects Completed in FY 2022
    INDOT Research Program Benefit Cost Analysis—Return on Investment for Projects Completed in FY 2022
    McCullouch, Bob
    2023-12-01 | PDF
    To demonstrate the value of research and its implementation, the Governor’s Office initially requested an annual financial analysis of the INDOT Research Program to determine the return on the research investment (ROI). The INDOT Research & Development (R&D) has continued to publish an annual Return on Investment report. The current financial analy ...
  • MPO Board Member Training on Congestion Reduction Policy Brief
    MPO Board Member Training on Congestion Reduction [Policy Brief]
    Kramer, Jeff ;
    Dinehart, Taylor
    2023-12-01 | PDF
    The goal of this project is to change that paradigm by developing a training program that educates MPO board members on the potential for enacting system-wide and corridor-level congestion management and reduction strategies through the federally required metropolitan transportation planning process. More specific goals of this project include aidi ...
  • 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.
  • 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 ...
  • 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 ...
  • 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.
  • 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 ...
  • 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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