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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 4621 - 4640 of 36908 results
  • MultiStage Algorithm for DetectionError Identification and Data Screening
    Multi-Stage Algorithm for Detection-Error Identification and Data Screening
    Azin, Bahar ;
    Yang, Xianfeng (Terry)
    2020-10-01 | PDF
    During the past decades, roadside traffic detectors have been widely deployed in traffic management systems to help transportation agencies monitor and control traffic. However, detector data may contain some erroneous information caused by the malfunctioning of the detection system. Typically, these errors result from the lack of maintenance and t ...
  • Detection and Estimation of Inundation and Associated Risks Using Traffic Monitoring Cameras and Image Processing Under Extreme Flooding Conditions [supporting datasets]
    Ham, Suyun ;
    Noh, Seongjin
    2020-10-01 | PDF
    The main objective of this project is to develop an inundation detection and evaluation framework using images from traffic monitoring cameras and reliable flood monitoring under extreme precipitation conditions. This study presents a comparative assessment of image enhancement and segmentation techniques to automatically identify the flash floodin ...
    Dataset Supporting Files
  • Air Quality Implications of COVID19 in California
    Air Quality Implications of COVID-19 in California
    Pan, Shuai ;
    Gao, H Oliver
    2020-10-01 | PDF
    The COVID-19 pandemic has significantly affected human health and the economy. The implementation of social distancing practices to combat the virus spread, however, has led to a notable improvement in air quality. This study compared the surface air quality monitoring data from the United States Environmental Protection Agency (U.S. EPA)’s AirNow ...
  • Reducing Vehicle Miles Traveled VMT Encouraging Walk Trips and Facilitating Efficient Trip Chains Through Polycentric Development
    Reducing Vehicle Miles Traveled (VMT), Encouraging Walk Trips, and Facilitating Efficient Trip Chains Through Polycentric Development
    Ewing, Reid ;
    Park, Keunhyun
    2020-10-01 | PDF
    Compact development can result in many benefits for communities and residents. Areas can connect compact developments through high-quality transportation options, creating a network of centers, or a “polycentric” region. This development pattern is very popular in Europe and is linked to significant benefits. Salt Lake County has organically develo ...
  • Experimental Study of Tunnels in Squeezing Ground Conditions
    Experimental Study of Tunnels in Squeezing Ground Conditions
    Arora, Ketan ;
    Gutierrez, Marte
    2020-10-01 | PDF
    Squeezing rock conditions have been causing significant risks in the construction of tunnels in rock formations, especially at great depth and in weak and/or weathered rock masses. The tunnel excavation may induce a stress change with considerable deviatoric stress that can cause squeezing ground behavior. The mechanism of squeezing failure of tunn ...
  • Workshop on Implementing Ultra Thin Slurry Surfacings on TxDOT Roadways Workshop Participant Handbook
    Workshop on Implementing Ultra Thin Slurry Surfacings on TxDOT Roadways: Workshop Participant Handbook
    Nyamuhokya, Tito ;
    Scullion, Tom
    2020-10-01 | PDF
    Workshop Objectives: • To present findings of research study 5-6615-01 “Implementing the Next Generation of Ultra Thin Slurry Seals” • To present the benefits and limitations of ultra thin slurry seals. • To provide guidelines and recommendations on the use of ultra thin slurry seals. • To discuss future directions for these types of surfacings.
  • A Geographically Weighted Regression Model to Examine the Spatial Variation of the Socioeconomic and LandUse Factors Associated with Strava Bike Activity in Austin Texas
    A Geographically Weighted Regression Model to Examine the Spatial Variation of the Socioeconomic and Land-Use Factors Associated with Strava Bike Activity in Austin, Texas
    Munira, Sirajum ;
    Sener, Ipek N.
    2020-10-01 | PDF
    Despite evidence showing the spatial nonstationarity of the determinants of bike activity, very few studies have addressed the phenomena, probably due to the limited sample size of the traditional count data. To address this gap, this study demonstrated the applicability of Strava bike activity data by developing a geographically weighted Poisson r ...
  • Eco-Friendly Stabilization of Sulfate-Rich Expansive Soils Using Geopolymers for Transportation Infrastructure [supporting datasets]
    Yu, Xinbao ;
    Puppala, Anand J.
    2020-10-01 | PDF
    Traditional calcium-based stabilizers, such as lime, to stabilize sulfate-rich expansive soils, are lasting-challenges in geotechnical engineering. The biggest problem with using calcium-based stabilizers is that when calcium and water are exposed to sulfate-rich expansive soils, they form ettringite as an expansive mineral, which causes sulfate-in ...
    Dataset Supporting Files
  • Research Product P1 Updated Construction Specifications Developing UltraThin Slurry Mixtures and Field Evaluation
    Research Product P1, Updated Construction Specifications [Developing Ultra-Thin Slurry Mixtures and Field Evaluation]
    Scullion, Tom ;
    Estakhri, Cindy
    2020-10-01 | PDF
    As documented in the project summary report, the existing slurry materials are not recommended for main lane applications because of an unacceptable drop in skid resistance. To address this a new specification is proposed and included in this tech memo. The main change with this test is the use of the 3-wheel polisher and Dynamic Friction Tester to ...
  • Automating the Generation of Construction Checklists
    Automating the Generation of Construction Checklists
    Cai, Hubo ;
    Jeon, JungHo
    2020-10-01 | PDF
    Construction inspection is a critical component of INDOT’s quality assurance (QA) program. Upon receiving an inspection notice/assignment, INDOT inspectors review the plans and specifications to identify the construction quality requirements and conduct their inspections accordingly. This manual approach to gathering inspection requirements from te ...
  • Strategies for Managing Freight Traffic Through Urban Areas Technical Report
    Strategies for Managing Freight Traffic Through Urban Areas: Technical Report
    Shelton, Jeff ;
    Morgan, Curtis
    2020-10-01 | PDF
    Economic activity in most cities relies heavily on the movement of goods via freight vehicles. The freight transportation system has a direct impact on the livelihood and success of urban areas; however, the presence of trucks on the freeway system further increases congestion as the trucks interact with passenger vehicles. Trucks take up a large p ...
  • Performance of Asphalt Concrete Crack Sealants in South Dakota
    Performance of Asphalt Concrete Crack Sealants in South Dakota
    Fick, Damon
    ORCID ICON IMG
    2020-10-01 | PDF
    The ingress of surface water and snowmelt through cracks in asphalt pavements may reduce their service life due to wetting of sensitive subsoils or expansion during winter months. Asphalt crack sealants are a relatively low-cost pavement maintenance treatment that helps preserve the integrity of the road surface. The objectives of this research wer ...
  • Promoting TransitOriented Developments by Addressing Barriers Related to Land Use Zoning and Value Capture
    Promoting Transit-Oriented Developments by Addressing Barriers Related to Land Use, Zoning, and Value Capture
    Mathur, Shishir ;
    Gatdula, Aaron
    2020-10-01 | PDF
    This study advances land use, transportation planning, and public finance research by identifying: a) the various land use, zoning, and value capture-related barriers to the construction of transit-oriented developments (TODs); and b) the major strategies that are commonly used or could be used to address these barriers. The value capture (VC) tool ...
  • Developing and Testing an Advanced Hybrid Electric Vehicles EcoCooperative Adaptive Cruise Control System at Multiple Signalized Intersections
    Developing and Testing an Advanced Hybrid Electric Vehicles Eco-Cooperative Adaptive Cruise Control System at Multiple Signalized Intersections
    Chen, Hao ;
    Rakha, Hesham A.
    2020-10-01 | PDF
    This research develops an advanced Eco-Cooperative Adaptive Cruise Control System (Eco-CACC) for hybrid electric vehicles (HEVs) to pass signalized intersections with energy-optimized speed profiles, with the consideration of impacts by multiple signalized intersections. The research extends the Eco-CACC at signalized intersections (Eco-CACC-I) sys ...
  • Detection Technology Testbed on I 475 Technology Feasibility Study
    Detection Technology Testbed on I 475: Technology Feasibility Study
    Guin, Angshuman ;
    Hunter, Michael
    2020-10-01 | PDF
    This project evaluates the feasibility of use and potential benefits of a video-based automatic incident detection (AID) technology relative to existing detection via the Georgia 511 (NaviGAtor) incident reports and transportation management center operators’ manual observations. This study proposes a clustering machine learning framework for devel ...
  • DataDriven Safety Analysis A User Guide
    Data-Driven Safety Analysis: A User Guide
    Wunderlich, Robert ;
    Dixon, Karen
    2020-10-01 | PDF
    The purpose of this guide is to demonstrate how to use data-driven safety analyses to improve safety on Texas Department of Transportation (TxDOT) roadways. Sections include: (1) Describing TxDOT district safety issues, including using data and graphing to analyze crash trends; (2) Screening the network to identify locations with potential for safe ...
  • Evaluate Potential Impacts Benefits Impediments and Solutions of Automated Trucks and Truck Platooning on Texas Highway Infrastructure Technical Report
    Evaluate Potential Impacts, Benefits, Impediments, and Solutions of Automated Trucks and Truck Platooning on Texas Highway Infrastructure: Technical Report
    Birgisson, Bjorn ;
    Morgan, Curtis A.
    2020-10-01 | PDF
    This report presents a study that conducted an assessment of the potential impacts, benefits, and impediments of the introduction of automated trucks and truck platooning on Texas highway infrastructure. The assessment included, but was not limited to, identification or review of the following: (a) any needed infrastructure hardening decisions and ...
  • Engineered Cementitious Composites ECC for Applications in Texas
    Engineered Cementitious Composites (ECC) for Applications in Texas
    Park, Philip ;
    Jones, Robert
    2020-10-01 | PDF
    The objective of this project was to identify the applications of engineered cementitious composites (ECC) that are suitable for the Texas transportation system. To achieve this goal, the following three activities were conducted: (1) literature review and data analysis, (2) survey on ECC state-of-the-practice, and (3) cost-benefit analysis through ...
  • MASH Test 311 Evaluation of TxDOT WBeam Guardrail With 7Inch Diameter Round Wood Posts in Concrete Mow Strip
    MASH Test 3-11 Evaluation of TxDOT W-Beam Guardrail With 7½-Inch Diameter Round Wood Posts in Concrete Mow Strip
    Moran, Sana M ;
    Bligh, Roger P.
    2020-10-01 | PDF
    The purpose of the testing reported herein was to assess the performance of the Texas Department of Transportation (TxDOT) W-beam guardrail with 7½-inch diameter round wood posts in concrete mow strip according to the safety-performance evaluation guidelines included in the American Association of Safety Highway and Transportation Officials Manual ...
  • Making Every Day Count Applying DataDriven Safety Analyses in a TxDOT District
    Making Every Day Count: Applying Data-Driven Safety Analyses in a TxDOT District
    Wunderlich, Robert ;
    Dixon, Karen
    2020-10-01 | PDF
    Using a data-driven approach to analyze safety issues and projects will help Texas Department of Transportation (TxDOT) districts to target safety investments with more confidence and reduce crashes on Texas highways. Many predictive and systemic analysis tools are now available that provide the means to quantify safety impacts in a similar way so ...
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