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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 341 - 360 of 36841 results
  • Behavioral Investigation of Temporary and Permanent Pedestrian Infrastructure
    Behavioral Investigation of Temporary and Permanent Pedestrian Infrastructure
    Craig, Curtis M. ;
    Morris, Nichole L.
    2026-01-01 | PDF
    Agencies may treat pedestrian crossing sites initially with temporary treatments (i.e., removable flexible delineators or bollards) to test efficacy, but the pedestrian safety effects of temporary infrastructure are not well understood. This study tested the impact of temporary and permanent pedestrian infrastructure such as curb extensions/bump-ou ...
  • Alternative Deicer Performance Characterization Know Before the Snow
    Alternative Deicer Performance Characterization: Know Before the Snow
    Druschel, Stephen J.
    2026-01-01 | PDF
    MnDOT has been using alternative deicers (potassium chloride, magnesium chloride, and calcium chloride) to melt roadway ice at temperatures colder than sodium chloride can melt it alone. Using alternative deicers in brine form has been a way to leverage treatment techniques at temperatures below 15 degrees F. However, these alternative deicers have ...
  • Improving and Developing Pavement Design Inputs and Performance Functions for Cold Recycled Pavement Layers in Minnesota
    Improving and Developing Pavement Design Inputs and Performance Functions for Cold Recycled Pavement Layers in Minnesota
    Dave, Eshan V. ;
    Sias, Jo E.
    2026-01-01 | PDF
    Existing specifications in Minnesota and many other states fail to adequately characterize the properties of cold recycled pavement materials necessary for pavement design procedures. Current assumptions for these materials are not entirely accurate as these materials often possess complex, non-linear, stress and rate dependent behavior. This can l ...
    Supporting Files
  • Lidar for Geotechnical Applications Technical Summary
    Lidar for Geotechnical Applications [Technical Summary]
    Gautreau, Gavin P.
    2026-01-01 | PDF
    This research focused on the utilization of Light Detection and Ranging (LiDAR) technology within the Louisiana Department of Transportation and Development (DOTD) for various geotechnical applications. The study addresses key aspects, including site investigation and reconnaissance for drilling operations, Geotechnical Asset Management inventory d ...
  • An Enhanced NetworkLevel Curve Safety Assessment and Monitoring Using Mobile Devices Refinement and Field Evaluation
    An Enhanced Network-Level Curve Safety Assessment and Monitoring Using Mobile Devices – Refinement and Field Evaluation
    Tsai, Yichang (James) ;
    Mohammadi, Mohsen
    2026-01-01 | PDF
    Horizontal curves represent a small portion of the roadway network yet account for nearly one-quarter of fatal crashes, most of which involve vehicles running off the road due to excessive speed. Installing advisory speed signs before horizontal curves is a key countermeasure used by safety engineers to reduce curve-related fatalities, and identify ...
  • Traffic Data for Network Level Pavement Structural Assessment and Performance Grade Asphalt Selection
    Traffic Data for Network Level Pavement Structural Assessment and Performance Grade Asphalt Selection
    Zhong, Jingtao ;
    Gu, Yangsong
    2026-01-01 | PDF
    Truck traffic is an important input for pavement design and analysis. Proper characterization of traffic patterns contributes to the design of reliable and cost-effective pavement structures. Axle load spectra obtained from the Long-Term Pavement Performance (LTPP) database, together with local Annual Average Daily Traffic (AADT) data from Tennesse ...
  • Durability of Lightweight Concrete Bridge Decks in Utah
    Durability of Lightweight Concrete Bridge Decks in Utah
    Guthrie, W. Spencer ;
    Eusebi-Diehr, Lorenzo
    2026-01-01 | PDF
    The objectives of this research were to document and compare properties of lightweight concrete and normal-weight concrete used for construction of bridge decks and approach slabs in northern Utah. The scope of work included field and laboratory testing to characterize concrete at three lightweight concrete bridge deck sites and the normal-weight c ...
  • Using Electric Vehicle Onboard Data for Pavement Quality Assessment and Management
    Using Electric Vehicle Onboard Data for Pavement Quality Assessment and Management
    Stern, Raphael ;
    Nouhi, Shaghayegh
    2026-01-01 | PDF
    This project investigated the feasibility of using electric vehicle onboard diagnostics (OBD-II) data for pavement quality assessment in Minnesota, inspired by Denmark's Live Road Assessment (LiRA) project. The research addressed the critical need for cost-effective, continuous pavement monitoring to supplement expensive instrumented vehicle survey ...
  • Artificial Intelligence and Its Role and Use Within State DOTs
    Artificial Intelligence and Its Role and Use Within State DOTs
    Egge, Mark ;
    Tate, Syndney
    2026-01-01 | PDF
    Artificial Intelligence (AI) is increasingly shaping the way state Departments of Transportation (DOTs) approach both research and daily operations. This powerful technology creates new opportunities for improving efficiency, supporting decision-making, and streamlining agency workflows, but it also presents new challenges, including concerns about ...
  • Improved Signalized Intersection Performance Using Computer Vision and Artificial Intelligence Technical Summary
    Improved Signalized Intersection Performance Using Computer Vision and Artificial Intelligence [Technical Summary]
    Moomen, Milhan ;
    Codjoe, Julius
    2026-01-01 | PDF
    The objective of this project was to develop and evaluate artificial intelligence (AI)-based computer vision tools for intersection performance analysis. The specific objectives were to: • Develop a vehicle counting framework based on detection-tracking-counting pipeline for accurate turn-movement measurements; • Develop an integrated framework for ...
  • Creation of an Allweather Road Impact Prediction System ARIPS Summary
    Creation of an All-weather Road Impact Prediction System (ARIPS) [Summary]
    Reeves, Heather D. ;
    Rosenow, Andrew A.
    2026-01-01 | PDF
    This project is designed to examine the utility of using the database of flood-induced road closures collected by MoDOT to develop an Artificial Intelligence/Machine Learning (AI/ML) model. This was accomplished by assembling a database of predictors. These predictors include quantitative precipitation estimates, hydrologic model output, and a seri ...
  • Creation of an Allweather Road Impact Prediction System ARIPS
    Creation of an All-weather Road Impact Prediction System (ARIPS)
    Reeves, Heather D. ;
    Rosenow, Andrew A.
    2026-01-01 | PDF
    This project is designed to examine the utility of using the database of flood-induced road closures collected by MoDOT to develop an Artificial Intelligence/Machine Learning (AI/ML) model. This was accomplished by assembling a database of predictors. These predictors include quantitative precipitation estimates, hydrologic model output, and a seri ...
  • Developing a Pedestrian Safety Performance Function for Oregon
    Developing a Pedestrian Safety Performance Function for Oregon
    Roll, Josh ;
    Anderson, Jason
    2026-01-01 | PDF
    This report details the development of a pedestrian safety performance function (SPF) for intersections in urban areas in the state of Oregon. The report documents the process to develop SPFs for pedestrian crashes including the process to develop the data for analysis. A key innovation of this work is the use of pedestrian traffic volume estimates ...
  • VehicletoInfrastructure Work Zone Geometry Reconstruction With PoseConditioned UWB Range Denoising
    Vehicle-to-Infrastructure Work Zone Geometry Reconstruction With Pose-Conditioned UWB Range Denoising
    Liu, Jiaxi ;
    Li, Hangyu
    2026-01-01 | PDF
    Reliable work zone mapping is important for connected and autonomous vehicles (CAVs) to navigate safely and smoothly through work zone areas. Cone-mounted ultra-wideband (UWB)roadside units (RSU) offer a cost-effective way for work zone layout inference, as roadside anchors and vehicle tags provide direct vehicle-to-infrastructure (V2I) range const ...
  • Statewide NonMotorized Traffic Monitoring Study Technical Summary
    Statewide Non-Motorized Traffic Monitoring Study [Technical Summary]
    Bian, Ruijie "Rebecca" ;
    Mitran, Elisabeta
    2026-01-01 | PDF
    The growing emphasis on creating a multimodal transportation system in the U.S. requires high-quality multimodal traffic data for planning success. This research investigated strategies for integrating non-motorized (e.g., bicyclist and pedestrian) traffic monitoring into routine motorized traffic monitoring practices in Louisiana.
  • Trip Generation for Various Sites Technical Summary
    Trip Generation for Various Sites [Technical Summary]
    Bian, Ruijie "Rebecca" ;
    Codjoe, Julius
    2026-01-01 | PDF
    The purpose of this project was to determine whether ITE trip rates, published in the ITE Trip Generation Manual, are appropriate for use in Louisiana for a selection of land use types. Based on previous work conducted by LTRC for strip malls, it was anticipated that the published trip rates may not be applicable in Louisiana for a number of differ ...
  • Evaluation of SaturatesAromaticsResinsAsphaltenes SARA Fractionation of Asphalt Binders in Louisiana Technical Summary
    Evaluation of Saturates/Aromatics/Resins/Asphaltenes (SARA) Fractionation of Asphalt Binders in Louisiana [Technical Summary]
    Salari, Saman ;
    Akentuna, Moses
    2026-01-01 | PDF
    The objective of this project was to evaluate asphalt binder characterization using SARA fractionation via Thin-Layer Chromatography with Flame Ionization Detection(TLC/FID), and to analyze these results alongside available Gel Permeation Chromatography (GPC) data. The primary focus of this study was to investigate the sensitivity and capability of ...
  • Enhanced Traffic Pattern Knowledge Abstraction and Presentation From 511 Database
    Enhanced Traffic Pattern Knowledge Abstraction and Presentation From 511 Database
    Ding, Jiannan ;
    Koshy, Liya
    2025-12-31 | PDF
    The explosive growth in the volume, variety, and velocity of transportation data has placed considerable strain on traditional data infrastructures employed by state departments of transportation (state DOTs). Existing traffic information systems are constrained by fragmented data streams, limited historical archiving, and inadequate interoperabili ...
  • Operational Baseline and Structural Health Monitoring for the 2nd Avenue Network Arch Bridge
    Operational Baseline and Structural Health Monitoring for the 2nd Avenue Network Arch Bridge
    Attanayake, Upul ;
    Amunugama, Harsha
    2025-12-31 | PDF
    A unique network tied-arch bridge with free-standing arches was designed to carry 2nd Avenue traffic over Interstate (I-94) in Detroit, Michigan. This 245-ft-long, 96.5-ft-wide bridge, skewed at 18 degrees, is the first skewed, unbraced network arch bridge constructed in the United States. The superstructure frame was erected off-site at a bridge s ...
  • A Synthesis Study to Identify and Make Recommendations on the Appropriate Nondestructive Testing Tools for Bridge Beam Ends Piers and Abutments
    A Synthesis Study to Identify and Make Recommendations on the Appropriate Nondestructive Testing Tools for Bridge Beam Ends, Piers, and Abutments
    Panjehpour, Pan ;
    Baah, Prince
    2025-12-30 | PDF
    The aim of this research was to identify suitable NDT methods for bridge components by evaluating their advantages, disadvantages, and limitations. The research objectives are: (1) to identify suitable NDT tools and techniques for condition evaluation of bridge beam-ends, abutments, and piers based on their advantages and disadvantages, (2) to iden ...
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