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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 4181 - 4200 of 36011 results
  • Traffic Control Device Analysis Testing and Evaluation Program FY2019 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY2019 Activities
    Finley, Melisa D. ;
    Fitzpatrick, Kay
    2020-10-01 | PDF
    This project provides the Texas Department of Transportation with a mechanism to conduct high-priority, limited-scope evaluations of traffic control devices. Work conducted and concluded during the 2019 fiscal year included: (1) Review of the application of embedded light-emitting diodes (LEDs) in signs. (2) Review of the design and application of ...
  • Assessment of Compatibility of Mineral Aggregates and Binders Used in Highway Construction and Maintenance Projects [supporting datasets]
    Hossain, Zahid ;
    Elsayed, Ashraf
    2020-10-01 | XLSX
    Stripping and delamination have been deemed as some of the major premature pavement distresses to most state Departments of Transportations (DOTs) and highway agencies including the Arkansas Department of Transportation (ARDOT). It is believed that the poor compatibility between asphalt binders and aggregates is one of the major reasons behind this ...
    Dataset Supporting Files
  • Workshop on Implementing Ultra Thin Slurry Surfacing on TxDOT Roadways Workshop Instructor Guidebook
    Workshop on Implementing Ultra Thin Slurry Surfacing on TxDOT Roadways: Workshop Instructor Guidebook
    Nyamuhokya, Tito ;
    Scullion, Tom
    2020-10-01 | PDF
    In research project 0-6615, Use of Fine Graded Asphalt Mixes, which ended on August 31, 2012, the Performing Agency developed a new generation of slurries to be implemented for pavement preservation in test sections around Texas. This new generation of slurries had not been evaluated widely on Texas Highways by the Receiving Agency, but several Rec ...
  • Southern California Regional Workforce Development Needs Assessment for the Transportation and Supply Chain Industry Sectors
    Southern California Regional Workforce Development Needs Assessment for the Transportation and Supply Chain Industry Sectors
    O'Brien, Tom ;
    Matsumoto, Deanna
    2020-10-01 | PDF
    COVID-19 brought the public’s attention to the critical value of transportation and supply chain workers as lifelines to access food and other supplies. This report examines essential job skills required of the middle-skill workforce (workers with more than a high school degree, but less than a four-year college degree). Many of these middle-skill ...
  • Advanced Modeling and Design Methodology for Pavements Using Plasticity-Based Shakedown Theory [supporting datasets]
    Chen, Shengli ;
    Sun, Chao
    2020-10-01 | ZIP
    Pavement design is a process intended to find the most economical combination of layer thickness and material type for the pavement, taking into account the properties of the subgrade soil and the traffic to be carried during the service life of the road. The currently prevalent methods of pavement analysis and design, however, are more or less emp ...
    Dataset Supporting Files
  • Automated and Connected Vehicle AVCV Test Bed to Improve Transit Bicycle and Pedestrian Safety Phase II Technical Report
    Automated and Connected Vehicle (AV/CV) Test Bed to Improve Transit, Bicycle, and Pedestrian Safety: Phase II Technical Report
    Turnbull, Katherine F. ;
    Balke, Kevin
    2020-10-01 | PDF
    Crashes involving transit vehicles, bicyclists, and pedestrians are a concern in Texas, especially in urban areas. This research explored the potential of automated and connected vehicle (AV/CV) technology to reduce or eliminate these crashes. The project objectives focused on identifying safety concerns related to the interaction of transit vehicl ...
  • Get More Out of Variable Speed Limit VSL Control An Integrated Approach to Manage Traffic Corridors with Multiple Bottlenecks
    Get More Out of Variable Speed Limit (VSL) Control: An Integrated Approach to Manage Traffic Corridors with Multiple Bottlenecks
    Gao, Hang ;
    Cheng, Shenyang
    2020-10-01 | PDF
    The model based variable speed limit (VSL) control has been proven effective to resolve capacity-drop and time delay at a single recurrent bottleneck in previous studies. This project applies VSL controls to the traffic corridors with multi-segment and multi-bottleneck with the objective of reducing fuel consumption and greenhouse gas emissions. Ba ...
  • 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 | XLSX
    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 | ZIP
    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 ...
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