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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 3101 - 3120 of 36873 results
  • 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 ...
  • 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 ...
  • 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 ...
  • Bigdata Analytics and Artificial Intelligence for Smart Intersections
    Bigdata Analytics and Artificial Intelligence for Smart Intersections
    Banerjee, Tania ;
    Chen, Ke
    2022-06-01 | PDF
    This project aims to develop a multi-sensor system for vehicle and pedestrian traffic analysis at traffic intersections. The techniques developed as part of this project are used to process data streams from video-camera and LIDAR systems installed at traffic intersections (along with the loop detector data captured by advanced traffic controllers) ...
  • Deep Learning for Unmonitored Water Level Prediction and Risk Assessment
    Deep Learning for Unmonitored Water Level Prediction and Risk Assessment
    Corns, Steven M ;
    Long, Suzanna K
    2022-06-01 | PDF
    The research uses publicly available data to develop deep learning models to predict river gauge heights at unmonitored locations in Missouri. The geospatial and rainfall data for 20 different catchment areas of Missouri is used in tandem with the clustering and ensemble deep learning approaches to develop a high-performance deep learning model tha ...
  • 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 ...
  • Evaluation of the Performance of Rumble Strips on Pavements Where Seal Coats Have Been Applied Project Summary Report
    Evaluation of the Performance of Rumble Strips on Pavements Where Seal Coats Have Been Applied [Project Summary Report]
    Wilson, Bryan ;
    Jurado, Camilo
    2022-05-31 | PDF
    The objective of this study was to determine how many layers of seal coat (i.e., chip seal) can be applied before rumble strip performance is compromised. Seal coat applied for pavement maintenance partially fills existing rumble strips (Figure 1), reducing the levels of noise and vibration and potentially undermining the rumble strip function.
  • 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 ...
  • Utilization of Accelerated Pavement Tester APT for New Materials and Pavement Structure Research
    Utilization of Accelerated Pavement Tester (APT) for New Materials and Pavement Structure Research
    Huang, Baoshan ;
    Jiang, Xi
    2022-05-30 | PDF
    Accelerated pavement test (APT) is defined as the controlled application of a prototype wheel loading at the appropriate load to the full-scale pavement structure, which is used to determine the structural responses and performance of the pavement in a short period. Inverted pavement is an unconventional type of flexible pavement structure. In this ...
  • 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 ...
  • Quantify Freeway Safety Service Patrol and Protect the Queue Impact on Transportation Network Reliability
    Quantify Freeway Safety Service Patrol and Protect the Queue Impact on Transportation Network Reliability
    Zhang, Hairuilong ;
    Gu, Yangsong
    2022-05-30 | PDF
    The objective of this project is to evaluate and quantify the impacts and benefits of Freeway Safety Service Patrol (FSSP) and Protect the Queue (PTQ) programs using data-driven analysis. TDOT’s Locate/IM and PTQ daily working reports data are the primary source of this study, which will help better understand the characteristics of incidents. WAZE ...
  • Design Considerations and Limitations of Rock DowelsAnchors Loaded in Shear
    Design Considerations and Limitations of Rock Dowels/Anchors Loaded in Shear
    Palomino, Angelica M. ;
    Mobley, Sarah J.
    2022-05-30 | PDF
    In Tennessee, cut rock slopes with exposed discontinuities are often reinforced with grouted steel anchors installed across the discontinuity to stabilize the system by immobilizing the rock material above the sliding surface. These elements resist shear loading rather than function in tension. Yet, the steel bar may bend in cases where the discont ...
  • Airports as Connected Activity Centers
    Airports as Connected Activity Centers
    Miller, Matthew McKee ;
    Peng, Justin
    2022-05-25 | PDF
    This research project determined how airports could function as connected activity centers. The current state of policy is to treat airports as secluded from the rest of the metropolitan area and only engage in reactive planning in response to specific threats or crises. To seek out other models of airport development, a combination of literature r ...
  • Tire Derived Aggregate for Underdrain Applications Final Report
    Tire Derived Aggregate for Underdrain Applications - Final Report
    Miller, Tanya
    2022-05-18 | PDF
    Since 1990, VTrans and the Vermont Agency of Natural Resources (VANR) have had an interest in the repurposing of tire byproducts in transportation infrastructure, including the use of shredded whole scrap tires, known as Tire Derived Aggregate (TDA). Vermont’s universal recycling laws have made reliable quantities of material available, though a ma ...
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