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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 5261 - 5280 of 36022 results
  • Distribution and Habitat Use of the Rusty Patched Bumble Bee Bombus affinis and the YellowBanded Bumble Bee Bombus terricola in Ohio
    Distribution and Habitat Use of the Rusty Patched Bumble Bee (Bombus affinis) and the Yellow-Banded Bumble Bee (Bombus terricola) in Ohio
    Goodell, Karen ;
    Mitchell, Randall
    2019-11-01 | PDF
    Bumble bees contribute to Ohio’s economic success and natural resources by pollinating wildflowers and crop plants. Two formerly widespread species have recently declined in Ohio: the Rusty-Patched Bumble Bee (Bombus affinis), designated as federally endangered in 2017, and the Yellow-Banded Bumble Bee (Bombus terricola). Understanding their curren ...
  • Understanding Interactions between Drivers and Pedestrian Features at Signalized Intersections Phase 3
    Understanding Interactions between Drivers and Pedestrian Features at Signalized Intersections – Phase 3
    Lin, Pei-Sung ;
    Kourtellis, Achilleas
    2019-11-01 | PDF
    This Phase 3 project aimed to implement and evaluate selected countermeasures recommended from the Phase 2 project via pilot studies in Florida to support future successful statewide implementation. The pedestrian signs being evaluated for this project included (1) “Stop Here on Red” (R10-6, R10-6a et.), (2) “No Turn on Red,” (R10-11, R10-11a et.) ...
  • Curve Safety Improvements Using Mobile Devices and Automatic Curve Sign Detection Phase I
    Curve Safety Improvements Using Mobile Devices and Automatic Curve Sign Detection – Phase I
    Tsai, James (Yichang) ;
    Wu, Yiching
    2019-11-01 | PDF
    A disproportionally high number of serious vehicle crashes (25% of fatal crashes) occur on horizontal curves (FHWA, 2019), even though curves represent only a fraction of the roadway network (5% of highway miles) (FHWA, 2016). The MUTCD (Manual on the Uniform Traffic Control Devices) (FHWA, 2012) requires various horizontal alignment warning signs ...
  • Recommended Transition Plan for the Texas Technology Task Force
    Recommended Transition Plan for the Texas Technology Task Force
    Werner, Mark ;
    Bruce, Mac
    2019-11-01 | PDF
    The Texas Technology Task Force is an external advisory board to the Texas Department of Transportation (TxDOT) that conducts technology discovery activities and delivers recommendations for advancing technology to prepare the future Texas transportation system. The Task Force is developing a Technology Utilization Plan that will serve as the fulcr ...
  • Access Management Implementation
    Access Management Implementation
    Gattis, J. L. ;
    Demosthenes, Philip
    2019-11-01 | PDF
    The broad objectives of this project were to (1) examine and document the current access management practices in Arkansas; (2) present current access management practices in other selected states, as well as the state-of-the practice, so they can be compared with current access management practices within Arkansas; (3) develop new policies or rules ...
  • Update Rainfall Coefficients with 2018 NOAA Atlas 14 Rainfall Data Project Summary
    Update Rainfall Coefficients with 2018 NOAA Atlas 14 Rainfall Data [Project Summary]
    Birt, Andrew ;
    Gu, Chaoyi
    2019-10-31 | PDF
    In this project, researchers used National Oceanic Atmospheric Administration (NOAA) Atlas 14 data to update an existing Texas Department of Transportation (TxDOT) hydraulic design tool. NOAA Atlas 14 data describe rainfall frequency, intensity, and duration. The Atlas 14 data were used to update and redevelop a tool (EBDLKUP-2019) that enables des ...
  • Union Cab Cooperative of Madison Commute to Careers Program Evaluation 20182019
    Union Cab Cooperative of Madison Commute to Careers Program Evaluation 2018–2019
    Allon, Alexander ;
    Ruth, Annette Marie
    2019-10-31 | PDF
    Despite decades of research and government investment in commute options for low-income workers, mobility barriers are still a major hindrance for low income workers and employers alike. In this case study, we analyze a traditional taxicab firm’s initiative to enter the employment transportation arena with a ride service. The business model propose ...
  • Design of a Hybrid Rebalancing Strategy to Improve Level of Service of FreeFloating Bike Sharing Systems
    Design of a Hybrid Rebalancing Strategy to Improve Level of Service of Free-Floating Bike Sharing Systems
    Mahmoodian, Vahid ;
    Zhang, Yu
    2019-10-31 | PDF
    For managing the supply-demand imbalance in free-floating bike sharing systems, we propose dynamic hubbing (i.e., dynamically determining geofencing areas) and hybrid rebalancing (combining user-based and operator-based strategies) and solve the problem with a novel multi-objective simulation optimization approach. Given historical usage data and r ...
  • A Stochastic Rail Wear Forecast Using Mixture Density Networks and the Laplace Distribution
    A Stochastic Rail Wear Forecast Using Mixture Density Networks and the Laplace Distribution
    Palese, Joseph ;
    Zarembski, Allan M.
    2019-10-31 | PDF
    The US rail network consists of more than 232,000 miles of track (as of 2016). More than 160,000 miles are classified as Class I railway (belonging to a railway with operating revenue greater than $458M). (Association of American Railroads, 2017). In 2016, Class I railroads replaced or installed nearly 7,000 miles of rail. (Association of American ...
  • Improving Design Phase Evaluations for High Pile Rebound Soils with an Emphasis on SPT Testing Final Report
    Improving Design Phase Evaluations for High Pile Rebound Soils with an Emphasis on SPT Testing: Final Report
    Cosentino, Paul J. ;
    Wisnom, Brian
    2019-10-30 | PDF
    Pile rebound, which is a complex phenomenon that occurs when large diameter displacement piles are driven into very fine sands with silts and clays, causes serious construction delays and cost overruns. It has been a problem many contractors have faced for well over a decade. Piles driven into thick layers within both the Hawthorn and Alum Bluff Gr ...
  • PTV VISSIM Simulation Data for Efficient Eco-Ramp Control Project Funded by NCST 18–19 Dataset
    Wu, Guoyuan ;
    Zhao, Zhouqiao
    2019-10-20 | ZIP
    Our current transportation system faces a variety of issues in terms of safety, mobility, and environmental sustainability. The emergence of innovative intelligent transportation system (ITS) technologies such as connected and automated vehicles (CAVs) and transportation electrification unfold unprecedented opportunities to address aforementioned i ...
    Dataset Supporting Files
  • Speed Trajectory Data from Adaptive Eco-Driving Applications [supporting datasets]
    Hao, Peng ;
    Wei, Zhensong
    2019-10-17 | PDF
    The eco-approach and departure (EAD) application for signalized intersections has been proved to be environmentally efficient in a Connected and Automated Vehicles (CAVs) system. In the real-world traffic, the traffic-related information received from sensing or communication devices is highly uncertain due to the limited sensing range and varying ...
    Dataset Supporting Files
  • HandHeld Diagnostic Controller for ITS Field Maintenance Phase II
    Hand-Held Diagnostic Controller for ITS Field Maintenance Phase II
    Donecker, Stephen M. ;
    Swanston, Travis
    2019-10-11 | PDF
    The Caltrans field element network includes several hundred changeable message signs (CMS), generically referred to as dynamic message signs (DMS), and many more closed-circuit TV (CCTV) cameras. The number of these elements motivates development of diagnostic tools that are handheld, quick, inexpensive, and straightforward for maintenance staff. T ...
  • Improving Effectiveness of HOV Facilities Behavioral and Operational Considerations
    Improving Effectiveness of HOV Facilities – Behavioral and Operational Considerations
    McDonald, Mark P
    2019-10-10 | PDF
    This report documents and details the work done on Project RES 2017-01, Improving Effectiveness of HOV Facilities - Operational and Behavioral Considerations. In this project, the problem of the extremely high violation rates in Nashville’s High Occupancy Vehicle (HOV) lanes is considered. Specifically, the project seeks to: (1) document the curren ...
  • Consumer Use Adoption of Advanced Vehicle Systems
    Consumer Use & Adoption of Advanced Vehicle Systems
    Seppelt, Bobbie ;
    Coughlin, Joseph F.
    2019-10-10 | PDF
    Despite an abundant use of the term “Out of the loop” (OOTL) in the context of automated driving and human factors research, there is currently a lack of consensus on its precise definition, how it can be measured, and the practical implications of being in or out of the loop during automated driving. The main objective of this paper is to consider ...
  • Measuring the Impact of a Landslide on Transportation Infrastructure to Improve Mobility and Safety
    Measuring the Impact of a Landslide on Transportation Infrastructure to Improve Mobility and Safety
    Darrow, Margaret M. ;
    Schwarber, Jaimy
    2019-10-10 | PDF
    Frozen debris lobes (FDLs) are landslides in permafrost, many located along the Dalton Highway corridor, Brooks Range, Alaska. The closest to the highway, FDL-A has demonstrated a steadily increasing rate of movement over the last several decades. Recognizing the risk, in 2018 the Alaska Department of Transportation and Public Facilities (ADOT&PF) ...
  • Technology Influence on Travel Demand and Behaviors [supporting datasets]
    Sisiopiku, Virginia P. ;
    Hadi, Mohammed
    2019-10-08 | ZIP
    Over the last decade, the popularity of Transportation Network Companies (TNCs) as a mode of travel has been increasing at a steady pace, even in medium size cities. However, the determinants that influence transportation users to adopt TNCs as a preferred mode choice are still not well understood, nor are the impacts of such preferences on their t ...
    Dataset Supporting Files
  • Reducing Wildlife Mortality on Roads in Vermont Determining Relationships Between Structure Attributes and Wildlife Movement Frequency Through Bridges and Culverts To Improve Related Conservation Investments
    Reducing Wildlife Mortality on Roads in Vermont: Determining Relationships Between Structure Attributes and Wildlife Movement Frequency Through Bridges and Culverts To Improve Related Conservation Investments
    Marangelo, Paul
    ORCID ICON IMG
    2019-10-08 | PDF
    This project gathered and analyzed game-camera data on the frequency of wildlife movement through bridges and culverts in Vermont to generate results-based recommendations for improving the permeability of highways in Vermont for wildlife. By better understanding the characteristics of transportation structures that wildlife are more likely to use ...
  • Development of a Strategy to Address Load Posted Bridges Through Reduction in Uncertainty in Load Ratings TxDOT Workshop
    Development of a Strategy to Address Load Posted Bridges Through Reduction in Uncertainty in Load Ratings: TxDOT Workshop
    Texas A&M University. Zachry Department of Civil Engineering  ...
    2019-10-07 | PDF
    Development of a strategy to address load posted bridges through reduction in uncertainty in load ratings TxDOT workshop PowerPoint presentation.
  • Development of a Strategy To Address Load Posted Bridges Through Reduction in Uncertainty in Load Ratings TxDOT Workshop
    Development of a Strategy To Address Load Posted Bridges Through Reduction in Uncertainty in Load Ratings: TxDOT Workshop
    Texas A&M Transportation Institute
    2019-10-07 | PDF
    Determine appropriate strategies to remove load postings for Texas bridges posted at load levels below the legal limit.
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