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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 5721 - 5740 of 36990 results
  • Characterization and Quantification of Traffic Load Spectra in Texas Overweight Corridors and Energy Sector Zones Final Report
    Characterization and Quantification of Traffic Load Spectra in Texas Overweight Corridors and Energy Sector Zones: Final Report
    Ashtiani, Reza S. ;
    Morovatdar, Ali
    2019-11-01 | PDF
    Energy-related activities such as natural gas and crude oil production in Texas have created large volumes of overweight (OW) truck operations, resulting in expedited deterioration and premature failure of transportation infrastructures. This project’s primary goal was to develop a database of the site-specific axle load spectra for energy corridor ...
  • Economic Effect of Restricted Crossing UTurn Intersections in Louisiana Tech Summary
    Economic Effect of Restricted Crossing U-Turn Intersections in Louisiana [Tech Summary]
    Schneider, Helmut ;
    Zeringue, Kirk M.
    2019-11-01 | PDF
    The restricted crossing U-turn (RCUT) aka J-turn intersection is an innovative alternative intersection design that displaces left turn and through movements from the minor street in order to serve through traffic on the major street. The J-turn is capable of providing a relatively high level of service (LOS) to major road through traffic over a wi ...
  • Emerging Trends in Design Professional Liability Policies in Innovative Project Delivery
    Emerging Trends in Design Professional Liability Policies in Innovative Project Delivery
    Ashuri, Baabak ;
    Lee, Jung Hyun
    2019-11-01 | PDF
    Prepared in cooperation with the GDOT Office of Innovative Delivery, this research found the areas of challenges of design liability in the design–build environment, including: (a) issues related to design claims in design–build, (b) heightened standard of care in design–build, and (c) change in design professional liability insurance due to design ...
  • Economic Effect of Restricted Crossing UTurn Intersections in Louisiana
    Economic Effect of Restricted Crossing U-Turn Intersections in Louisiana
    Schneider, Helmut ;
    Barnes, Stephen
    2019-11-01 | PDF
    Economic Effect of Restricted Crossing U-The RCUT, aka J-turn intersection, is an innovative alternative intersection design that displaces leftturn and through movements from the minor street. There is sufficient evidence that these designs reduce severe injury crashes and the FHWA hence added them to their list of “Proven Safety Countermeasures.” ...
  • Pilot Implementation for Preventing Incorrect Turns at HighwayRail Grade Crossings
    Pilot Implementation for Preventing Incorrect Turns at Highway-Rail Grade Crossings
    Lin, Pei-Sung ;
    Wang, Zhenyu
    2019-11-01 | PDF
    Incorrect turns onto railroad tracks may occur if a highway-rail grade crossing is close to an intersection or a freeway on-ramp. This project aimed to evaluate three low-cost countermeasures to prevent incorrect turns onto railroad tracks: (1) elimination of potentially misleading pavement markings and signs before railroad crossings, (2) implemen ...
  • Regression Equations for Estimating Flood Discharges for the Western Coastal Plain Region of Maryland
    Regression Equations for Estimating Flood Discharges for the Western Coastal Plain Region of Maryland
    Thomas Jr, Wilbert O ;
    Sanchez-Claros, Windsor
    2019-11-01 | PDF
    Regression equations were updated for estimating the 1.25-. 1.50-, 2-, 5-, 10-, 25-, 50-, 100-, 200- and 500-year flood discharges for the Western Coastal Plain Region of Maryland. The regression equations were based on flood discharges for 23 stations and drainage area, in square miles; impervious area, in percent of the watershed; and hydrologic ...
  • Evaluating Effective Asphalt Content in CIR Mixtures
    Evaluating Effective Asphalt Content in CIR Mixtures
    Wegman, Daniel E. ;
    Sabouri, Mohammadreza
    2019-11-01 | PDF
    In this study, to evaluate the effect of emulsion reduction during the cold in-place recycling (CIR) process in the field, three laboratory CIR mix designs were performed using the same reclaimed asphalt pavement (RAP) material and emulsion at three different mixing temperatures. The mix design results showed that as the mixing temperature increase ...
  • Susceptibility of Bridge Steel and Concrete Components to Microbiological Influenced Corrosion MIC and Microbiological Influenced Deterioration MID in Florida Summary
    Susceptibility of Bridge Steel and Concrete Components to Microbiological Influenced Corrosion (MIC) and Microbiological Influenced Deterioration (MID) in Florida [Summary]
    Lau, Kingsley
    2019-11-01 | PDF
    Florida International University researchers investigated the effects of microbially induced corrosion (MIC) on steel. They experimented with a variety of protective methods to determine their ability to prevent or mitigate MIC.
  • 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 | PDF
    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
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