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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 2641 - 2660 of 35959 results
  • Development of Congestion Factors for Adjusting Traffic Counts during Congested Periods Phase 1 Literature Review and Survey Summary
    Development of Congestion Factors for Adjusting Traffic Counts during Congested Periods: Phase 1 — Literature Review and Survey [Summary]
    Florida. Department of Transportation. Civil Integrated Management Office
    2022-06-01 | PDF
    Florida State University researchers conducted a comprehensive literature review to collect information on traffic data collection using ILDs, particularly during congested periods.
  • Reducing Vehicle Miles Traveled VMT Associated with K12 Public Schools How Well Do New School Sites in California Incorporate Mitigation Measures Known to Reduce VMT
    Reducing Vehicle Miles Traveled (VMT) Associated with K-12 Public Schools: How Well Do New School Sites in California Incorporate Mitigation Measures Known to Reduce VMT?
    Vincent, Jeffrey M ;
    Maves, Sydney
    2022-06-01 | PDF
    California law (SB 743) requires school districts to measure the impact of school construction on the production of greenhouse gas emissions (GHG) and identify feasible mitigation measures that eliminate or substantially reduce the number of vehicle miles traveled (VMT) generated. This study analyzes 301 new schools constructed between 2008-2018 wi ...
  • Wet Pond Maintenance for Phosphorus Retention
    Wet Pond Maintenance for Phosphorus Retention
    Taguchi, Vinicius J ;
    Janke, Benjamin D
    2022-06-01 | PDF
    This report considers the outcomes of the pond maintenance strategies of sediment treatment to reduce internal loading of phosphorus, mechanical aeration, alteration of pond outlet to pull water off the bottom, reduction of wind sheltering, dredging, outlet treatment by iron enhanced sand filtration and reduction of phosphorus loading from the wate ...
  • NonDestructive Evaluation and Numerical Modeling of Unrated Installed Crash Barriers
    Non-Destructive Evaluation and Numerical Modeling of Unrated Installed Crash Barriers
    Pokhrel, Ashesh ;
    Sorensen, Andrew D.
    2022-06-01 | PDF
    Finite element models (FEM) for Midwest Guardrail System (MGS) and constant UDOT slope 42-in and 54-in cast-in-place (CIP) fixed barriers are created in LS-DYNA. The FEM of a Chevrolet Silverado pickup truck is used to perform a Test Level 3 (TL-3) crash simulation for the MGS. FEMs of a Ford 800 single unit truck (SUT) and a tractor-trailer are us ...
  • Infrastructure Owner Operator IOO Strategic Roadmap for Accelerated Adoption of Automated Vehicles AVs
    Infrastructure Owner Operator (IOO) Strategic Roadmap for Accelerated Adoption of Automated Vehicles (AVs)
    Avery, Paul ;
    Letourneau, Mathew
    2022-06-01 | PDF
    The Automated Vehicle Pooled Fund Study (AV PFS) commissioned the development of the Infrastructure Owner Operator (IOO) Strategic Roadmap for Accelerated Adoption of AVs Project to consolidate guidance and identify programs that support the ability for IOOs to nationally move forward towards integrating AVs into the surface transportation ecosyste ...
  • Enhancing the Accuracy of Construction Cost Estimates for Major Lump Sum LS Pay Items and Generating a MoreAccurate List of Pay Items Throughout the Design Development Process
    Enhancing the Accuracy of Construction Cost Estimates for Major Lump Sum (LS) Pay Items and Generating a More-Accurate List of Pay Items Throughout the Design Development Process
    Ashuri, Baabak ;
    Baek, Minsoo
    2022-06-01 | PDF
    State departments of transportation (DOTs) encounter a critical challenge in estimating accurate cost estimates for major lump sum (LS) pay items, such as Traffic Control and Grading Complete, due to incomplete project information during the early stages of project development. To estimate prices for LS pay items, cost estimators and designers in s ...
  • Using Big Data and Machine Learning To Evaluate and Rank the Performance of Traffic Signals in Tennessee
    Using Big Data and Machine Learning To Evaluate and Rank the Performance of Traffic Signals in Tennessee
    Miao, Lei ;
    Meleby, Piro
    2022-06-01 | PDF
    Transportation agencies are tasked with making decisions and taking actions to fight congestion and improve road conditions using the methods and resources available to them. Performance evaluations of traffic conditions at signalized intersections and arterials provide practical data for the agencies to make well-informed decisions for targeted re ...
  • Pilot Inservice Performance Evaluation of Impact Attenuators in Washington State
    Pilot In-service Performance Evaluation of Impact Attenuators in Washington State
    Abbott, Paul ;
    Manchas, Brad
    2022-06-01 | PDF
    A pilot routine in-service performance evaluation (ISPE) was undertaken for impact attenuatorsfollowing the process outlined in NCHP 22-33. Controlled stop, rollover, vehicle mix, and secondary impacts on the roadside and roadway were evaluated as performance measures using data sourced from the Crash Location & Analysis System (CLAS) database and ...
  • Division of Operations Research OnCall ROC Task5 ODOT Overtime Management
    Division of Operations Research On-Call (ROC) Task#5 – ODOT Overtime Management
    Schroeder, Bastian ;
    Lim, Tiffany
    2022-06-01 | PDF
    ODOT funded this study to investigate existing overtime management practices in the US and search for potential automated systems that are capable of alleviating overtime management challenges. The project conducted a national scan and extensive agency outreach to evaluate existing systems. It further completed interviews with ODOT staff and develo ...
  • Utilization of Laser Induced Breakdown Spectroscopy LIBS for RealTime Testing and Quality Control Monitoring of Aggregate Materials used in Highway Construction Technical Summary
    Utilization of Laser Induced Breakdown Spectroscopy (LIBS) for Real-Time Testing and Quality Control Monitoring of Aggregate Materials used in Highway Construction [Technical Summary]
    Kansas. Department of Transportation
    2022-06-01 | PDF
    Laser scanning of transportation aggregate materials provides a means to identify aggregate types, sources, and quality in near real-time. The Transportation Pooled Fund (TPF) effort described in this report began as a sequel to a TRB IDEA Program proof of concept laboratory study in 2012, and culminated in the development of the first commercial l ...
  • Pilot Inservice Performance Evaluation of Guardrail Terminals in Washington State
    Pilot In-service Performance Evaluation of Guardrail Terminals in Washington State
    Abbott, Paul ;
    Manchas, Brad
    2022-06-01 | PDF
    A pilot routine in-service performance evaluation (ISPE) was undertaken for guardrail terminals following the process outlined in NCHRP 22-33. Controlled stop, rollover, vehicle mix, and secondary impacts on the roadside and roadway were evaluated as performance measures using data sourced from the Crash Location & Analysis System (CLAS) database a ...
  • Building 360 Scanning and Reality Modeling
    Building 360 Scanning and Reality Modeling
    Bjork, Christopher ;
    Lovelace, Barritt
    2022-06-01 | PDF
    The ability to collect and utilize large amounts of data is transforming our world. Industries like healthcare, finance, energy, communication, and transportation are finding ways to utilize data to improve people’s lives. Processing software and inspection-specific asset management platforms are giving asset owners the ability to utilize this data ...
  • DataDriven Prioritization and Empirical Predictions for Bridge Scour in Nebraska
    Data-Driven Prioritization and Empirical Predictions for Bridge Scour in Nebraska
    Awg Bolhasan, Awgku Ahmad Hashim B ;
    Wood, Richard L.
    2022-06-01 | PDF
    The effect of scour at the bridge substructure results in an increase in the vulnerability of the overall bridge stability. Previous studies have found that current guidelines are often overly-conservative with respect to scour. This project aims to provide guidance on hydraulic modeling parameters and reasonable scour estimates specific to Nebrask ...
  • Understanding Florida Motorcycle Crashes and Injury Outcomes Using the Motorcycle Crash Causation Study MCCS Dataset Summary
    Understanding Florida Motorcycle Crashes and Injury Outcomes Using the Motorcycle Crash Causation Study (MCCS) Dataset [Summary]
    Florida. Dept. of Transportation. Safety Office
    2022-06-01 | PDF
    University of South Florida researchers examined MCCS data to determine the relationship of locational, temporal, trip, motorcycle, injury, and contributing crash factors and to develop a basis for informed decision making by FDOT for strategies, countermeasures, and policy.
  • Linking Measurements From a Differential Emissivity Imaging Disdrometer DEID To StormSnow Instabilities
    Linking Measurements From a Differential Emissivity Imaging Disdrometer (DEID) To Storm-Snow Instabilities
    Pardyjak, Eric ;
    Morrison, Travis
    2022-06-01 | PDF
    This report describes a collaborative study conducted by the University of Utah Environmental Fluid Dynamics (EFD) Lab in collaboration with Particle Flux Analytics, Inc., Alta Ski Patrol and the Utah Department of Transportation (UDOT). The objectives of the project were to: (1) field test the Differential Emissivity Imaging Disdrometer (DEID) in ...
  • Development of Guidelines for Inspection Repair and Use of Portable Concrete Barriers Project Summary
    Development of Guidelines for Inspection, Repair, and Use of Portable Concrete Barriers [Project Summary]
    Dobrovolny, Chiara S ;
    Bhutani, Shristi
    2022-05-31 | PDF
    The proposed guidelines help determination of the appropriateness of using a specific PCB segment based on existing segment damage modes. These guidelines can be used at several work stages, such as upon delivery to the project site, during initial setup, during phase changes, and periodically throughout the duration of the project.
  • 07050 Improving the Identification of CurveRelated Crashes in the Crash Records Information System CRIS Project Summary
    0-7050: Improving the Identification of Curve-Related Crashes in the Crash Records Information System (CRIS) [Project Summary]
    Zhang, Zhanmin ;
    Xu, Yang
    2022-05-31 | PDF
    The research team started with a thorough review of horizontal curves and their impacts on traffic crashes. This review encompassed the following topics: characteristics of horizontal curves; impacts of horizontal curves on crash risk, frequency, and severity; and factors affecting crashes on horizontal curves. A comprehensive study was then conduc ...
  • Performance Evaluation of Full Depth Reclaimed FDR Pavements in Tennessee
    Performance Evaluation of Full Depth Reclaimed (FDR) Pavements in Tennessee
    Owino, Joseph ;
    Onyango, Mbakisya
    2022-05-31 | PDF
    This research was conducted by the University of Tennessee at Chattanooga (UTC) and Middle Tennessee State University (MTSU) in collaboration with Tennessee Department of Transportation (TDOT) and this report summarizes the research effort accomplished the objectives of TDOT Research solicitation RES2020-11 “Performance Evaluation of Full Depth Rec ...
  • Shear Behavior of Spliced Posttensioned Girders With Ungrouted Tendons Project Summary
    Shear Behavior of Spliced Post-tensioned Girders With Ungrouted Tendons [Project Summary]
    Bayrak, Oguzhan ;
    Han, Sangyoung
    2022-05-31 | PDF
    The spliced girder research program conducted as part of TxDOT Project 0-6652 investigated the implications of spliced girder technology and resulted in updating the AASHTO LRFD Bridge Design Specification’s (AASHTO LRFD) General Procedure for shear design, which was originally developed based on the results of small-scale panel tests. However, TxD ...
  • ProofofConcept Research of Roadside LiDAR Sensing Multimodal Traffic
    Proof-of-Concept Research of Roadside LiDAR Sensing Multimodal Traffic
    Xu, Hao ;
    Zhao, Junxuan
    2022-05-30 | PDF
    Based on the project team's multiple years of research, deployment, and engineering application expertise, this project evaluated the accuracy, reliability, and efficiency of roadside LiDAR sensing and explored various traffic scenarios and applications of roadside LiDAR sensors. This project evaluated the accuracy, reliability, and efficiency of r ...
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