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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 2201 - 2220 of 36873 results
  • Evaluation of Allowable Taper Rates of Freestanding SingleSlope Concrete Barriers
    Evaluation of Allowable Taper Rates of Freestanding Single-Slope Concrete Barriers
    Bligh, Roger P. ;
    Cakalli, Sofokli
    2023-08-01 | PDF
    The Texas Department of Transportation desires to flare the ends of its freestanding single-slope concrete barrier system so the system can be terminated outside the clear zone. Currently, limited guidance exists on the acceptable flare rate for the single-slope portable concrete barrier under the American Association of State Highway and Transport ...
  • Evaluation of Attachments to Concrete Barrier Systems to Deter PedestriansVolume 1 Technical Report
    Evaluation of Attachments to Concrete Barrier Systems to Deter Pedestrians—Volume 1: Technical Report
    Silvestri-Dobrovolny, Chiara ;
    Bligh, Roger
    2023-08-01 | PDF
    Concrete rigid barriers are used in medians to separate traffic and on the roadside to shield hazards from motorists and motorists from hazards. These barriers need to demonstrate crashworthiness through full-scale testing per the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH). Attachm ...
  • Improving Safety Service Patrol Performance
    Improving Safety Service Patrol Performance
    Cetin, Mecit ;
    Yang, Hong
    2023-08-01 | PDF
    Safety Service Patrols (SSPs) provide motorists with assistance free of charge on most freeways and some key primary roads in Virginia. This research project is focused on developing a tool to help the Virginia Department of Transportation (VDOT) optimize SSP routes and schedules (hereafter called SSP-OPT). The computational tool, SSP-OPT, takes re ...
  • Maximizing Equity in Managed Lane Planning Technical Summary
    Maximizing Equity in Managed Lane Planning [Technical Summary]
    Larsen, Bradley ;
    Lari, Adeel Z.
    2023-08-01 | PDF
    Managed lanes provide transportation agencies with a strategy for reducing congestion and improving travel times along urban highways. These designated lanes, known as E-ZPass lanes in Minnesota, are available to carpoolers and transit users for free during high-traffic times, while vehicle owners who are driving alone pay a fee.
  • New Hampshire Department of Transportation Development of an Unmanned Aircraft Systems UAS Program
    New Hampshire Department of Transportation – Development of an Unmanned Aircraft Systems (UAS) Program
    WSP USA Inc.
    2023-08-01 | PDF
    Unmanned Aircraft Systems (UAS) are being used nationwide in an effort to improve safety, increase efficiency, increase quality, and reduce costs. A previous New Hampshire Department of Transportation (NHDOT) research project tested UAS technology to ascertain the ability to assist NHDOT with operations, development, and the execution of transporta ...
  • Incorporating the Site Variability and Laboratory InSitu Testing Variability of Soil Properties in Geotechnical Engineering Design Tech Summary
    Incorporating the Site Variability and Laboratory/ In-Situ Testing Variability of Soil Properties in Geotechnical Engineering Design [Tech Summary]
    Abu-Farsakh, Murad ;
    Zhang, Zhongjie “Doc”
    2023-08-01 | PDF
    The main objective of this research is to: Evaluate the operator-induced and equipment-induced variations on design soil properties; Evaluate the site spatial variations of design soil properties; Evaluate the best spatial interpolation method to generate synthetic CPT profiles and soil boring data from the existing CPT and soil boring data of the ...
  • Assessing Stormwater Ponds for Phosphorus Retention
    Assessing Stormwater Ponds for Phosphorus Retention
    Bintner, Ross ;
    Gulliver, John S.
    2023-08-01 | PDF
    This project’s goals were to understand the features or characteristics of ponds that impact their ability to retain phosphorus and then develop practical tools and recommendations for management practices.
  • Performance of Skew Reinforcing in InvertedT Bridge Caps of Donigan Road Bridge Katy Texas
    Performance of Skew Reinforcing in Inverted-T Bridge Caps of Donigan Road Bridge, Katy, Texas
    Joshi, Bhagirath ;
    Ramaswamy, Nagesh
    2023-08-01 | PDF
    Reinforced concrete inverted-T bridge caps (ITBCs) have been widely used in Texas and the United States bridges. They are aesthetically pleasing, offer a practical means to increase vertical clearance, and have practical applications to address landscaping requirements. The ITBCs in Texas are designed using the traditional empirical procedures outl ...
  • Measuring Transport Properties of Portland Cement Concrete Using Electrical Resistivity
    Measuring Transport Properties of Portland Cement Concrete Using Electrical Resistivity
    Hartell, Julie Ann ;
    O’Reilly, Matthew
    2023-08-01 | PDF
    Although classification tables based on susceptibility to chloride ion permeability are recommended in AASHTO T 358, the classification levels with respect to durability parameters may or may not be adequate. Of interest for concrete pavement performance, this study verifies the recommended classification levels against standard durability testing ...
  • Strengthening Communities with Innovative Right of Way Projects Technical Summary
    Strengthening Communities with Innovative Right of Way Projects [Technical Summary]
    Austin, Lisa ;
    Douma, Frank
    2023-08-01 | PDF
    When many urban highway projects were built several decades ago, thriving communities were physically divided and negatively impacted. As social awareness and urban design have evolved, some areas have developed strategies for repairing and revitalizing these communities by redesigning right of way (ROW) areas along highway corridors.
  • Evaluation of FDOT Corrosion Prevention and Control Programs Summary
    Evaluation of FDOT Corrosion Prevention and Control Programs [Summary]
    Duncan, Matthew ;
    Fadden, Matthew
    2023-08-01 | PDF
    This research reviewed commonly used materials and systems to evaluate and compare multiple practices and systems used across the State in terms of durability, cost, and long-term performance. Additionally, this project summarized current FDOT design requirements and specifications regarding corrosion control for reinforced concrete bridge structur ...
  • District Highway Maintenance Research OnCall ROC Task3 ODOT Maintenance Workflow
    District Highway Maintenance Research On-Call (ROC) –Task#3 ODOT Maintenance Workflow
    Schroeder, Bastian ;
    Rowe, Glenn
    2023-08-01 | PDF
    ODOT funded this study to investigate maintenance scheduling practices in the US and search for potential software systems that are capable of alleviating the challenges of maintenance scheduling. The project conducted a national scan and extensive agency outreach to evaluate existing approaches. It further completed interviews with ODOT staff and ...
  • Correlation of Rut Depths Measured by the Profilers of LTRC and DOTD PMS Tech Summary
    Correlation of Rut Depths Measured by the Profilers of LTRC and DOTD PMS [Tech Summary]
    Chen, Qiming
    2023-08-01 | PDF
    The objective of this research was to develop a correlation of rut depths measured with LTRC’s profiler with a 5-point laser system and DOTD PMS’s profiler with a scanning laser system. A standard operating procedure (SOP) of pavement rutting data collection, compilation, and delivery by LTRC was developed so that DOTD pavement engineers can use LT ...
  • Evaluating Pavements Designed for Longer Life Brief
    Evaluating Pavements Designed for Longer Life [Brief]
    Kutay, M. Emin
    2023-08-01 | PDF
    A 2015 state law directed the Michigan Department of Transportation (MDOT) to explore innovations that can help pavements last longer and require less maintenance. To accomplish the task, the agency designed and constructed four projects using top-of-the-line materials and building methods. The completed roads are predicted to have service lives th ...
  • Correlation of Rut Depths Measured by the Profilers of LTRC and DOTD PMS
    Correlation of Rut Depths Measured by the Profilers of LTRC and DOTD PMS
    Chen, Qiming ;
    Zhang, Zhongjie
    2023-08-01 | PDF
    This research study aimed at developing a correlation of rut depths measured with Louisiana Transportation Research Center's (LTRC’s) profiler with a 5-point laser system and Department of Transportation and Development (DOTD) Pavement Management System's (PMS’s) profiler with a scanning laser system. For this purpose, the transverse profile data c ...
  • Innovative Methods to Strengthen Internal KYTC Communications
    Innovative Methods to Strengthen Internal KYTC Communications
    Marks, P Gayle ;
    Jasper, Jeff
    2023-08-01 | PDF
    Communication is the linchpin of every organization. Poor communication leads to inefficiencies, frustration among staff, and employee disaffection and disengagement. Although some state transportation agencies have adopted comprehensive strategic plans for internal communications, many have taken a more piecemeal approach, with some Offices and un ...
  • Refining the Lane Guidance System for Snowplow Operators Technical Summary
    Refining the Lane Guidance System for Snowplow Operators [Technical Summary]
    Donath, Max ;
    Rowe, Daniel
    2023-08-01 | PDF
    Snowplow operators work in difficult, often low-visibility conditions. A new system assists drivers in knowing their lane position and warns of approaching obstacles. After operators tested the system over two winters, researchers gathered feedback, revised the system and readied it for the next step in statewide deployment.
  • Evaluating the Use of a NearMiss Reporting Program to Enhance Employee Safety Performance
    Evaluating the Use of a Near-Miss Reporting Program to Enhance Employee Safety Performance
    Dadi, Gabriel B. ;
    Taherpour, Farshid
    2023-08-01 | PDF
    Using safety incidents and crashes to improve safety performance is an outdated and reactive practice in safety and health programs. One component of a modern approach to safety is a near-miss reporting program. This type of program tracks close calls or near misses that do not result in an incident or crash, but which often can be an early indicat ...
  • Domestic Airline Fares Consumer Report First Quarter 2023 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: First Quarter 2023 Passenger and Fare Information
    United States. Department of Transportation
    2023-08-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
  • District Highway Maintenance Research OnCall ROC Task 07 Radar Emplacement Prediction Tool Exploration and Recommendations Fact Sheet
    District Highway Maintenance Research On-Call (ROC) - Task 07: Radar Emplacement Prediction Tool Exploration and Recommendations [Fact Sheet]
    Ramaswami, Adithya G ;
    McCrink, Matthew H
    2023-08-01 | PDF
    Emerging autonomous aircraft require unique infrastructure to provide vital information to ensure they remain well-clear of other flying objects. While there are many systems designed to provide such functionality, termed detect and avoid (DAA), ground-based radars have emerged as one of the most promising technical solutions to this challenging pr ...
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