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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 2821 - 2840 of 35959 results
  • Predictive Mapping of Rare Plants
    Predictive Mapping of Rare Plants
    Kafley, Hemanta ;
    Murray, Darrel
    2022-03-01 | PDF
    Populations of rare plants are often endangered due to various natural and anthropogenic disturbances that interfere with their specialized niches. These isolated populations are difficult to detect without intensive field surveys. Predicting potential geographic distributions of these species is important for conservation by allowing the implement ...
    Supporting Files
  • Rehabilitation of Deteriorated Timber Piles using Fiber Reinforced Polymer FRP Composites
    Rehabilitation of Deteriorated Timber Piles using Fiber Reinforced Polymer (FRP) Composites
    Gangarao, Hota ;
    Damich, Drew
    2022-03-01 | PDF
    Fiber reinforced polymer (FRP) composite wraps have been used for timber pile repair. However, design guidelines including strengthening equations are lacking for FRP-wrapped timber piles. This study evaluated the bond, bending, shear, and compressive strengths of five FRP-wrapped timber pile systems. Five glass FRP-wrap systems were evaluated: thr ...
  • Evaluating Fall Monarch Butterfly Roadkill Hotspot Incidence and Potential Roadkill Mitigation
    Evaluating Fall Monarch Butterfly Roadkill Hotspot Incidence and Potential Roadkill Mitigation
    Tracy, James ;
    Birt, Andrew
    2022-03-01 | PDF
    Roadkill of monarch butterflies and other arthropods and roadside nectar plants were recoded across Texas in 100 m transects in the fall and spring from fall 2019 to spring 2021. Texas fall monarch roadkill data from this and previous studies was used to extrapolate roadkill across the state, identify monarch roadkill hotspots, and develop MaxEnt m ...
  • Improved Practices for Determining the Infiltration Characteristics of Soils for Design of Stormwater BMPs
    Improved Practices for Determining the Infiltration Characteristics of Soils for Design of Stormwater BMPs
    Benoit, Jean ;
    Wuebbolt, Steven
    2022-03-01 | PDF
    There are currently several in situ and laboratory methods of determining hydraulic conductivity of soils, however, it remains a difficult parameter to obtain accurately and economically. To characterize hydraulic conductivity for the design of stormwater best management practices (BMP’s), the New Hampshire Department of Transportation currently us ...
  • Icy Road Forecast and Alert IcyRoad Validation and Refinement Using MDT RWIS Data Presentation
    Icy Road Forecast and Alert (IcyRoad): Validation and Refinement Using MDT RWIS Data [Presentation]
    Jin, Menglin S ;
    Fowler, Jennifer W
    2022-03-01 | PDF
    Drivers need reliable forecasts and alerts for icy road conditions, particularly the presence of black ice, to reduce winter driving risks. The Montana Department of Transportation (MDT) currently has 73 Road Weather Information System (RWIS) stations throughout the state, which are used to measure road surface temperature, sub-surface temperature, ...
  • Icy Road Forecast and Alert IcyRoad Validation and Refinement Using MDT RWIS Data Implementation Report
    Icy Road Forecast and Alert (IcyRoad): Validation and Refinement Using MDT RWIS Data [Implementation Report]
    Fowler, Jennifer W ;
    McBroom, Doug
    2022-03-01 | PDF
    State Departments of Transportation (DOTs) need road ice condition forecasts in order to arrange anti-icing/de-icing activities and to enhance public safety and awareness. Icy road fatalities account for 3.6 times more deaths than all other weather hazards combined (USDOT, 2001). The relative risk of vehicle crashes significantly increases given th ...
  • Results of Rancho Cordova Free 5 to Ride Ridehailing Discount Coupon Program
    Results of Rancho Cordova “Free $5 to Ride” Ridehailing Discount Coupon Program
    Harold, Brian ;
    Rodier, Caroline
    2022-03-01 | PDF
    Pilot programs have been implemented in cities across the U.S. to address the first- and last- mile problem with door-to-door shared microtransit, ridehailing companies, and shared-ride operators with dynamic pick-up locations. The City of Rancho Cordova and Lyft partnered to launch one such pilot in the form of a discount-based door-to-door (D2D) ...
  • Updated Layer Coefficients for GDOT Flexible Pavement Design
    Updated Layer Coefficients for GDOT Flexible Pavement Design
    Kim, S. Sonny ;
    Lee, Hyung S
    2022-03-01 | PDF
    Currently, the Georgia Department of Transportation (GDOT) uses the 1972 American Association of State Highway and Transportation Officials (AASHTO) empirical pavement design procedure for the structural design of highways. The layer coefficients used at this time by GDOT were empirically derived from pavement mixes more than 50 years ago. Since th ...
  • 3D StrutandTie Modeling for Design of Drilled Shaft Footings
    3D Strut-and-Tie Modeling for Design of Drilled Shaft Footings
    Yi, Yousun ;
    Kim, Hyunsu
    2022-03-01 | PDF
    A comprehensive study was conducted to characterize the structural response and develop design guidelines for drilled shaft footings. The study included large-scale testing and numerical analyses of footing specimens subjected to various loading conditions. A database of 35 drilled shaft footings constructed in Texas by TxDOT was established and an ...
  • Expansion of AASHTOWare ME Design Inputs for Asphalt Layers
    Expansion of AASHTOWare ME Design Inputs for Asphalt Layers
    Nabizadeh, Hadi ;
    Von Quintus, Harold L.
    2022-03-01 | PDF
    The Wisconsin Department of Transportation (WisDOT) has supported several research studies in the past decades to measure the mechanical or performance properties of asphalt mixtures in support of the AASHTOWare Pavement ME Design (PMED) software to design pavement structures in Wisconsin. The outcome from these studies was to prepare a library or ...
  • Development of Geosynthetic Pavement Interlayer Improvements
    Development of Geosynthetic Pavement Interlayer Improvements
    Kim, Y. Richard ;
    Sudarsanan, Nithin
    2022-03-01 | PDF
    Asphalt overlays often fail prematurely by allowing the propagation of existing cracks over the overlay surface, thereby forming reflective cracks. Among the many available interlayer reinforcement technologies, geosynthetic products are gaining popularity for mitigating reflective cracking. The main goal of this research effort is to ensure that N ...
  • A Guide for Sequencing and Placement of Noise Walls and Retaining Walls on TxDOT Projects
    A Guide for Sequencing and Placement of Noise Walls and Retaining Walls on TxDOT Projects
    Harbin, Kristopher B ;
    Kraus, Edgar
    2022-03-01 | PDF
    During construction of noise walls and retaining walls, difficulties can arise due to utility conflicts, construction phasing, and inadequate access. Texas Department of Transportation (TxDOT) design manuals and design guides mention that these potential conflicts should be considered when designing noise walls and retaining walls.
  • Development of Quality Standards for Inclusion of High Recycled Asphalt Pavement Content in Asphalt Mixtures Phase Tech Brief
    Development of Quality Standards for Inclusion of High Recycled Asphalt Pavement Content in Asphalt Mixtures – Phase Ⅳ [Tech Brief]
    Lee, Hosin David ;
    Williams, Chris
    2022-03-01 | PDF
    Public highway agencies encourage the use of recycled asphalt materials (RAM) in constructing pavements to the maximum extent possible with an equal performance. Low temperature cracking potential is a primary concern with high RAM mixtures, which is caused by the aging of asphalt through the oxidation. To minimize a low temperature cracking, vario ...
  • Feasibility of Adapting VisionEval for Scenario Planning
    Feasibility of Adapting VisionEval for Scenario Planning
    Miller, John S. ;
    Flynn, Dan F.B.
    2022-03-01 | PDF
    Transportation investment decisions require consideration of uncontrolled events (e.g., changes in family size, vehicle technology, population, fuel prices, or societal norms such as telecommuting) along with possible policy responses to achieve desired goals. Although the possibility of these multiple alternative futures suggests one should explic ...
  • Electric Vehicles Analysis of Revenue Issues and Charging Station Implementation Plans
    Electric Vehicles: Analysis of Revenue Issues and Charging Station Implementation Plans
    Van Dyke, Chris ;
    Gibson, Bryan
    2022-03-01 | PDF
    This document provides an executive-level summary of recent trends in the EV space. Its purpose is to orient KYTC leadership to key issues state-level government agencies are contending with.
  • Implementation of Porous Concrete in Sidewalks In New Jersey Technical Brief
    Implementation of Porous Concrete in Sidewalks In New Jersey [Technical Brief]
    Najm, Husam
    2022-03-01 | PDF
    Marketing pervious (porous) concrete sidewalk was implemented in the field to evaluate porous concrete construction practices and its short and long term performance. The sidewalk was monitored periodically through visual inspections for raveling and infiltration rate measurements for potential clogging. The implementation project also developed an ...
  • Bridge Deck Drainage Evaluation of KDOTs Current Design Guidance
    Bridge Deck Drainage: Evaluation of KDOT’s Current Design Guidance
    Michalek, Alexander ;
    Roundy, Joshua
    2022-03-01 | PDF
    Proper drainage of bridge decks is essential for vehicle safety and bridge sustainability. The evaluation of Kansas Department of Transportation (KDOT) design guidelines could reduce the likelihood of future deck drainage problems. Therefore, this research investigated current bridge deck drainage design guidelines and related literature and survey ...
  • Development of Quality Standards for Inclusion of High Recycled Asphalt Pavement Content in Asphalt Mixtures Phase
    Development of Quality Standards for Inclusion of High Recycled Asphalt Pavement Content in Asphalt Mixtures – Phase Ⅳ
    Lee, Hosin David ;
    Moon, Byungkyu
    2022-03-01 | PDF
    Public highway agencies encourage the use of recycled asphalt materials (RAM) in constructing pavements to the maximum extent possible with an equal performance. Low temperature cracking potential is a primary concern with high RAM mixtures, which is caused by the aging of asphalt through the oxidation. To minimize a low temperature cracking, vario ...
  • Idaho Qualified Products List System Needs Study
    Idaho Qualified Products List System Needs Study
    Smithwick, Jake B ;
    Sawyer, Jeff T
    2022-03-01 | PDF
    The primary objective of ITD’s Qualified Products List management group is to streamline the product evaluation process and increase the ITD’s capability to evaluate and identify high performance products. The team has an existing software solution, but future developments require specific guidance on product type inputs, nomenclature, and other pr ...
  • Development of Technical Guidance for the Assessment of Oversize and Overweight Vehicle Permit Fees in New Mexico Phase II
    Development of Technical Guidance for the Assessment of Oversize and Overweight Vehicle Permit Fees in New Mexico (Phase II)
    Zamen, Sina ;
    Ridgeway, Cyrena
    2022-03-01 | PDF
    The adverse impact of oversize/overweight (OS/OW) vehicles on pavements and bridges is a concern in New Mexico and other states due to the infrastructure damage caused by the large loads that are transported on the highway system. Moneys generated from permit fees should cover administrative and technical costs associated with the permitting proces ...
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