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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 61 - 80 of 36841 results
  • Trip Generation Rates for Various Sites
    Trip Generation Rates for Various Sites
    Bian, Ruijie "Rebecca" ;
    Stopher, Peter R.
    2026-07-01 | PDF
    The primary objective of this pilot study was to examine six types of land use of interest to the Louisiana Department of Transportation and Development (DOTD): apartment complexes, urgent care facilities, dollar stores, car washes, drive-thru banks, and drive-thru daiquiri/boil shops. This research aimed to answer six questions: (1) How much varia ...
  • Public Messaging and Behavior Change Systems for Circular Economies
    Public Messaging and Behavior Change Systems for Circular Economies
    Mishra, Sabyasachee ;
    Aravind, Avani
    2026-07-01 | PDF
    This study investigates the effectiveness of positive message framing in fostering sustainable behaviors, particularly in the context of litter prevention and circular economies. Focusing on the principles of Reduce, Reuse, and Recycle (3R), as well as anti-littering initiatives, the research evaluates public messaging strategies designed to influe ...
  • Silane Bridge Deck Rating
    Silane Bridge Deck Rating
    Ghazal, Ahmed I. ;
    Myers, John J.
    2026-07-01 | PDF
    Bridge decks are among the most vulnerable components of bridge structures due to the combined effects of multiple deterioration mechanisms, including traffic-induced abrasion, repeated freeze-thaw cycling, and chloride ingress. Surface impregnation using silane sealers has proven to be an effective method for mitigating concrete deterioration in b ...
  • Application of Digital Twins for Testing Connectivity Automation and Cooperation Applications
    Application of Digital Twins for Testing Connectivity, Automation, and Cooperation Applications
    Hadi, Mohammed ;
    Jeenprasom, Chonlachart
    2026-07-01 | PDF
    This study investigated the use of co-simulation for evaluating cooperative driving automation (CDA) applications within a work zone environment. The examined use case focused on the merging maneuvers of a single CDA-equipped vehicle into either a CDA platoon or a traffic stream consisting of human-driven vehicles near a work zone with a one-lane b ...
  • Development of a NonDestructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers
    Development of a Non-Destructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers
    Alexander, Christopher L. ;
    Sagüés, Alberto A.
    2026-07-01 | PDF
    The University of South Florida's Corrosion Research Laboratory previously developed a tendon imaging unit (TIU) capable of providing representative cross-section images of external tendons that show strand envelope position and the likelihood of grouting deficiencies. The objective of this work was to adapt the grout-based TIU for application to w ...
  • TSMO Strategies and Automation in Work Zones
    TSMO Strategies and Automation in Work Zones
    Jackels, Jon ;
    Falero, Cortney
    2026-07-01 | PDF
    This research evaluated the Missouri Department of Transportation's (MoDOT's) use of Transportation Systems Management and Operations (TSMO) strategies in work zones, with an emphasis on Smart Work Zone (SWZ) technologies and automation. Project objectives included identifying available TSMO strategies, documenting examples of their use, implementi ...
  • Determination of Test Methods to Quantify the Effects of Organic and Inorganic Constituents in Silica Sand Used for Construction
    Determination of Test Methods to Quantify the Effects of Organic and Inorganic Constituents in Silica Sand Used for Construction
    Ferraro, Christopher C. ;
    Riding, Kyle A.
    2026-07-01 | PDF
    Florida-produced fine aggregates are generally of suitable quality, and deleterious effects associated with organic matter are uncommon. However, naturally occurring organic constituents can affect cement hydration and early-age strength development depending on their concentration, composition, and interaction with cementitious phases. The sands e ...
  • Truck Parking Shortage Improving Efficiency and Identifying Opportunities
    Truck Parking Shortage: Improving Efficiency and Identifying Opportunities
    Stich, Bethany ;
    Mallum, Faisal
    2026-07-01 | PDF
    Providing safe and secure parking for the more than three million heavy trucks that move over 70% of the nation's freight is both a local and national issue. This is especially true for a major freight hub such as Louisiana, with its freight-intensive corridors, including I-10 and I-12. Currently, there is only one parking spot for every 11 trucks ...
  • Phase III Implementation of Shallow Foundations on Florida Limestone in FBMultiPier
    Phase III: Implementation of Shallow Foundations on Florida Limestone in FB-MultiPier
    Rodgers, Michael ;
    Wasman, Scott
    2026-07-01 | PDF
    The study highlights the implementation of shallow foundation analysis and design into the finite element software FB-MultiPier. Key details of the report are: ⅰ) Bearing capacity, settlement, and passive resistance of shallow foundations in Florida limestone are characterized with a graphical user input/output FEM software; ⅱ) Bearing capacity of ...
  • Utah SR 73 Eagle Mountain Mule Deer Crosswalk and WildlifeDetection Driver Warning System Research
    Utah SR 73 Eagle Mountain Mule Deer Crosswalk and Wildlife-Detection Driver Warning System Research
    Cramer, Patricia ;
    Hamlin, Robert
    2026-07-01 | PDF
    The State Road (SR) 73 Eagle Mountain Wildlife Crosswalk (Crosswalk) and Wildlife-Detection Driver Warning System (the System) were part of wildlife accommodation efforts to reduce mule deer/wildlife-vehicle collisions (WVC) while allowing mule deer migrations to continue across SR 73. These included the 60-feet wide Crosswalk gap in wildlife exclu ...
  • Using Vehicle Probe Data to Evaluate Speed Limits Year 3 Project Summary Report
    Using Vehicle Probe Data to Evaluate Speed Limits, Year 3 [Project Summary Report]
    Fitzpatrick, Kay ;
    Kutela, Boniphace
    2026-06-30 | PDF
    The Texas Manual on Uniform Traffic Control Devices and the Texas Department of Transportation's (TxDOT's) Procedures for Establishing Speed Zones manual (Speed Zone Manual) contain TxDOT's policies for setting regulatory speed limits. Regulatory speed limits are set based on the 85th percentile speed of free-flowing passenger cars and various site ...
  • Evaluating a TwoStage Roadside Ditch Design to Improve Environmental Performance Brief
    Evaluating a Two-Stage Roadside Ditch Design to Improve Environmental Performance [Brief]
    Schilling, Keith
    ORCID ICON IMG
    2026-06-30 | PDF
    This project evaluated the efficacy of the two-stage design for roadside ditches located in Iowa from multiple perspectives. For this purpose, the project team set forth the following research objectives:1. Evaluation of the performance of two-stage road side ditches for their ability to improve water quality by efficiently processing sediment and ...
  • Evaluation of Aggregate Gradation Specifications and the Feasibility of Harmonization With AASHTO Standards
    Evaluation of Aggregate Gradation Specifications and the Feasibility of Harmonization With AASHTO Standards
    Elgaali, Husam H. ;
    Shah, Ayesha
    2026-06-25 | PDF
    The aggregate gradations specified by the Indiana Department of Transportation (INDOT) differ from those of the American Association of State Highway and Transportation Officials (AASHTO). Preliminary discussions suggest that adopting AASHTO standard gradation sizes could provide national alignment and simplify production for those operating in mul ...
  • Refinement of Reinforced Concrete Box Culvert Installation Guidelines
    Refinement of Reinforced Concrete Box Culvert Installation Guidelines
    Moro, Carlos ;
    Espinoza, Wilson
    2026-06-15 | PDF
    This study developed a refined, data-driven framework to support the selection of reinforced concrete box culverts (RCBCs) in South Dakota, where designers often face uncertainty when choosing between cast-in-place (CIP) and precast systems under complex site conditions. The project combined stakeholder interviews, nationwide surveys, inspection re ...
  • What Happens When Cities Eliminate Minimum Parking Requirements Issue Brief
    What Happens When Cities Eliminate Minimum Parking Requirements? [Issue Brief]
    Schwartz, Ellen
    2026-06-01 | PDF
    Despite growing evidence that minimum parking requirements both constrain development and produce more parking than necessary or desirable, many cities remain reluctant to repeal them. A common concern is that eliminating these mandates will result in too little off-street parking. This issue brief synthesizes research from cities that have already ...
  • Evaluating the Benefits of Implementing Mobile Road Weather Information Sensors Phase II
    Evaluating the Benefits of Implementing Mobile Road Weather Information Sensors (Phase II)
    El-Rayes, Khaled ;
    Ignacio, Ernest-John
    2026-06-01 | PDF
    Several state departments of transportation have integrated mobile road weather information sensors (RWIS) and maintenance decision support systems (MDSS) to improve the performance of their winter maintenance operations. The main goal of this research project is to conduct a multi-year field study to evaluate the effectiveness of integrating mobil ...
  • Update of the ARDOT Workforce Forecasting System
    Update of the ARDOT Workforce Forecasting System
    Mitra, Suman ;
    Hernandez, Sarah
    2026-06-01 | PDF
    This report assesses the existing manpower forecasting tool used for workforce allocation and provides a comprehensive description of the development of a new, modern forecasting system. An extensive review of existing tools and state-of-the-art methods for similar forecasting was conducted, including the identification of key factors influencing m ...
  • Parking Requirements Drive Up Housing Costs Issue Brief
    Parking Requirements Drive Up Housing Costs [Issue Brief]
    Schwartz, Ellen
    2026-06-01 | PDF
    This issue brief synthesizes research that clearly demonstrates how minimum parking requirements exacerbate the housing affordability crisis. Parking requirements are zoning rules that require new homes to include a minimum number of off-street parking spaces, regardless of site-specific conditions, costs, or residents’ needs. Parking is expensive ...
  • Minimum Parking Requirements Fuel Driving Issue Brief
    Minimum Parking Requirements Fuel Driving [Issue Brief]
    Schwartz, Ellen
    2026-06-01 | PDF
    High levels of driving can impose significant social costs, including traffic injuries and deaths, congestion, air and noise pollution, and health risks linked to sedentary lifestyles. Minimum parking requirements amplify these impacts by encouraging car ownership and driving - and discouraging other ways of moving around. These mandates typically ...
  • Exploring the Use of VMT as an Evaluation Metric Within Virginias Transportation Planning Process
    Exploring the Use of VMT as an Evaluation Metric Within Virginia’s Transportation Planning Process
    Ohlms, Peter B. ;
    Kim, Aden
    2026-06-01 | PDF
    For several decades, transportation planners and engineers have used automobile Level of Service (LOS) to communicate transportation system conditions. In Virginia, stakeholders such as Fairfax County officials have shown interest in supplementing LOS with vehicle miles traveled (VMT), which can be a useful measure of vehicle travel and a proxy for ...
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