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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 1741 - 1760 of 36873 results
  • OpenGraded Friction Courses Suitable for Suburban Environments
    Open-Graded Friction Courses Suitable for Suburban Environments
    Tran, Nam ;
    Chen, Chen
    2024-03-01 | PDF
    The Florida Department of Transportation (FDOT) uses a 12.5-mm nominal maximum aggregate size (NMAS) open-graded friction course (OGFC) called FC-5 on multi-lane roads to enhance safety. However, FC-5 is susceptible to premature raveling on high-speed suburban roads due to increased lateral turning, braking and accelerating stresses. To address thi ...
  • Quantification of Field Performance and Nondestructive Testing of Timber Bridges in Colorado Brief
    Quantification of Field Performance and Nondestructive Testing of Timber Bridges in Colorado [Brief]
    Kim, Yail Jimmy
    2024-03-01 | PDF
    This report presents two major aspects related to evaluating timber bridges with nondestructive testing: i) laboratory experiments and ii) field applications. The first part of the report discusses the degradation processes and resulting outcomes of structural timber, Douglas Fir, that is broadly used for bridge construction. In accordance with the ...
  • Developing AIAssisted InSitu NDT Method for AirVoid Distribution Testing in Fresh and Hardened Concrete
    Developing AI-Assisted In-Situ NDT Method for Air-Void Distribution Testing in Fresh and Hardened Concrete
    Kong, Zhihao ;
    Mitra, Aritro Roy
    2024-03-01 | PDF
    Understanding the air void content in concrete is crucial since it significantly influences the durability and strength of the material, especially in environments susceptible to freeze-thaw cycles. This report introduces an advanced nondestructive testing (NDT) method for the in-situ detection of air voids in concrete by employing diffusive ultras ...
  • Prediction of Road Condition and Smoothness for Flexible and Rigid Pavements in Louisiana Using Neural Networks
    Prediction of Road Condition and Smoothness for Flexible and Rigid Pavements in Louisiana Using Neural Networks
    Wu, Zhong ;
    Liu, Yilong
    2024-03-01 | PDF
    The Louisiana Department of Transportation and Development (DOTD) currently utilizes pavement performance prediction models in treatment selection and budget planning. These models are solely based on the non-linear curve-fitting regression of existing pavement condition data available in its pavement management system (PMS) database. The objective ...
  • Prediction of Road Condition and Smoothness for Flexible and Rigid Pavements in Louisiana Using Neural Networks Technical Summary
    Prediction of Road Condition and Smoothness for Flexible and Rigid Pavements in Louisiana Using Neural Networks [Technical Summary]
    Wu, Zhong ;
    Zhang, Zhongjie "Doc"
    2024-03-01 | PDF
    The objective of this research was to develop both short- and long- term pavement performance and deterioration models that can be used to estimate future pavement conditions and smoothness using ANN modeling. Specifically, the short-term models were for the prediction of 2- and 4-year future pavement surface cracking percentages for the current Lo ...
  • Implementation of Safety Prediction Methods for Texas Highways Project Summary
    Implementation of Safety Prediction Methods for Texas Highways [Project Summary]
    Geedipally, Srinivas R. ;
    Pratt, Michael P.
    2024-02-29 | PDF
    In this implementation project, researchers first conducted a pilot testing of the safety prediction methodology. Researchers selected a sample of approximately 2 hours in duration containing multiple examples in the second session to demonstrate use of the spreadsheet tools.
  • Equipment and Lift Thickness Optimization for Structure Backfill Compaction Operations
    Equipment and Lift Thickness Optimization for Structure Backfill Compaction Operations
    Qiu, Tong ;
    Hu, Xiaobai
    2024-02-29 | PDF
    The objective of this research project is to identify the most efficient compaction procedure for AASHTO #1, #57, and #8 aggregates by varying equipment type (both heavy and lightweight), moisture content, lift thickness, roller speed/operation duration, and number of passes needed to meet the non-movement condition through a literature review, sur ...
  • Adaptive MultipleModel Kalman Filter for GNSS Carrier Phase and Frequency Estimation Through Wideband Interference
    Adaptive Multiple-Model Kalman Filter for GNSS Carrier Phase and Frequency Estimation Through Wideband Interference
    Zhao, Wengxiang ;
    Khanafseh, Samer
    2024-02-17 | PDF
    Interference events, both intentional and unintentional, are significant threats to global navigation satellite system (GNSS) service continuity. In the presence of interference, it can be difficult for GNSS receivers to maintain continuous tracking of carrier phase and frequency. To address this issue, in place of a traditional phase-locked loop ( ...
  • Actionable Flood Warnings Based on GroundTruth Data to Support Iowa DOT BridgeWatch Platform Functionality
    Actionable Flood Warnings Based on Ground-Truth Data to Support Iowa DOT BridgeWatch Platform Functionality
    Demir, Ibrahim ;
    Muste, Marian
    2024-02-15 | PDF
    The expectation of improved flood warnings has become critical for many agencies and communities at a time when flooding is increasingly severe and widespread. Formulation of flood warnings for a specific area entails three major steps: A) forecasting the flood hazards, B) delineation of the flood maps, and C) assessment of the threats to human saf ...
  • Assessing Safety and Mobility Benefits of Autonomous Ride Sharing Services
    Assessing Safety and Mobility Benefits of Autonomous Ride Sharing Services
    Classen, Sherrilene ;
    VandeWeerd, Carla
    2024-02-14 | PDF
    We examined the user perspective about autonomous ride sharing services among older adults (50+ years of age) in three different geographic areas in Florida (Lake Nona, Port St. Lucie, and The Villages). We utilized the Autonomous Ride Sharing Services Survey and participants’ lived experiences before and after exposure to the autonomous shuttle. O ...
  • A New Approach for Identifying Safety Improvement Sites on Rural Highways A Validation Study
    A New Approach for Identifying Safety Improvement Sites on Rural Highways: A Validation Study
    Dhakal, Bishal ;
    Al-Kaisy, Ahmed
    2024-02-08 | PDF
    The research presented in this paper examines a new proposed approach for identifying safety improvement sites on rural highways. Unlike conventional approaches, the proposed approach does not require crash history, but rather utilizes classified variables for traffic volume, geometric features, and roadside characteristics that do not require acce ...
  • Evaluation of Curb Ramp Compliance Review of Tools Methods and Time to Develop Error Tolerances
    Evaluation of Curb Ramp Compliance: Review of Tools, Methods, and Time to Develop Error Tolerances
    Che, Erzhuo ;
    Olsen, Michael J.
    2024-02-01 | PDF
    Americans with Disabilities Act (ADA) compliance is critical to ODOT’s mission to provide a safe and reliable multimodal transportation system by allowing equal access to infrastructure. Several challenges have resulted in difficulty in assessing compliance including inherent device errors, differences in measurement methods by inspectors, lack of ...
  • Active Transportation Counts from Existing OnStreet Signal and Detection Infrastructure
    Active Transportation Counts from Existing On-Street Signal and Detection Infrastructure
    Kothuri, Sirisha ;
    Singleton, Patrick A.
    2024-02-01 | PDF
    This study’s objective was to use data from existing traffic signal infrastructure to estimate pedestrian volumes. Pedestrian push-button actuations were collected from signal controller logs at 49 intersections in western Oregon and an additional 16 intersections in eastern Oregon. These actuations were then compared to observed pedestrian counts, ...
  • New Repair Strategies for LifeCycle Extension of Corroded Steel Girder Bridges Summary
    New Repair Strategies for Life-Cycle Extension of Corroded Steel Girder Bridges [Summary]
    Varma, Amit H. ;
    Connor, Robert J.
    2024-02-01 | PDF
    Steel girder ends are susceptible to corrosion damage due to deicing salts, water, and other contaminants leaking from failed expansion joints. When corrosion becomes significant, it leads to a reduction in the sectional properties of steel girders and consequently reduces bearing and shear resistance. Conventional repair methods, although effectiv ...
  • Trip Generation for Various Sites Research Project Capsule 242SS
    Trip Generation for Various Sites: Research Project Capsule [24–2SS]
    Bian, Ruijie “Rebecca” ;
    Rupnow, Tyson
    2024-02-01 | PDF
    This research covers six types of land uses of greater interest to DOTD as a pilot study. They are apartments, urgent care facilities, dollar stores, car washes, drive-thru banks, and drive-thru daiquiri/boil shops.
  • Using the Portable XRF To IdentifyVerify Field Material Properties
    Using the Portable XRF To Identify/Verify Field Material Properties
    Liu, Zhen ;
    Milla, Jose
    2024-02-01 | PDF
    In order to investigate the feasibility of rapid identification of chemical compounds or detection of certain additives or contaminants in commonly used construction materials with portable X-ray Fluorescence (XRF), stainless steel, anchor bolt, steel nut, steel washer, portland cement (type I, II, and III), class F fly ash, and aggregates were tes ...
  • Multistage Models for Dynamic RideSharing in Taxi Services and Congestion Analysis Brief
    Multi-stage Models for Dynamic Ride-Sharing in Taxi Services and Congestion Analysis [Brief]
    Quadrifoglio, Luca ;
    Zhang, Cheng
    2024-02-01 | PDF
    This research introduces practical optimization model for implementing ride-sharing in taxi services and studies the effects of ride-sharing on the congestion status through the case study of Chicago. Ride-sharing combines trips into one ride-shared trip with the objective of maximizing the total mileage saving. This research proposes a multi-stage ...
  • Endangered Species Mitigation Needs Assessment
    Endangered Species Mitigation Needs Assessment
    Schelsky, Wendy M ;
    Burkwald, Kimberly
    2024-02-01 | PDF
    The Illinois Department of Transportation, like most other state transportation agencies, must undergo an environmental review for each transportation project. IDOT identified several challenges that involve regulatory and implementation of federal and state laws protecting threatened and endangered species. We evaluated each state’s environmental ...
  • A Comparison of Department of Transportation Progress Scheduling Specifications From Across the Nation
    A Comparison of Department of Transportation Progress Scheduling Specifications From Across the Nation
    Shane, Jennifer S. ;
    Gatto, Andrew
    2024-02-01 | PDF
    One of the primary determinants of project success is completion of the project on or ahead of schedule. Owners therefore pay a great deal of attention to schedule progress and timely project completion. This holds true especially for departments of transportation (DOTs), each of which adheres to its own specification requirements for progress sche ...
  • Impact of Utility Delays on Project Delivery
    Impact of Utility Delays on Project Delivery
    Piratla, Kalyan R. ;
    Le, Tuyen
    2024-02-01 | PDF
    Utility issues often cause significant delays in transportation construction projects. These delays result from several factors spanning multiple project phases. This project studied the current utility process at the South Carolina Department of Transportation (SCDOT) and provided recommendations to minimize overall project delays. The project wor ...
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