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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 3281 - 3300 of 36873 results
  • 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 ...
  • Investigation of Secondary Crash Along Highways in Utah Phase I
    Investigation of Secondary Crash Along Highways in Utah, Phase I
    Zhang, Zhao ;
    Gong, Yaobang
    2022-03-01 | PDF
    The occurrence of secondary crashes on highways has many adverse effects, such as traffic congestion, air pollution, and more crashes. Research suggests that secondary crashes account for about 20% of all crashes and 18% of all fatalities on US freeways (Owens et al., 2010). While improving incident management is one of the effective ways to reduce ...
  • Use of a Novel Controlled Release Surface Curing Agent for Bridge Decks Phase 2
    Use of a Novel Controlled Release Surface Curing Agent for Bridge Decks Phase 2
    Chen, Lichun ;
    Ley, M Tyler
    2022-03-01 | PDF
    This report focuses on establishing methods to compare different curing methods and then determining how the timing of wet curing impacts the quality of the concrete in different evaporation environments. Chapter 2 uses electrical resistivity to non-destructively measure the moisture within concrete as it hydrates and correlates this to other measu ...
  • A Forecast of State Motor Fuel Revenues The Effect of New Technologies and the State Vehicle Fleet Mix on Georgia Motor Fuel Receipts
    A Forecast of State Motor Fuel Revenues: The Effect of New Technologies and the State Vehicle Fleet Mix on Georgia Motor Fuel Receipts
    Wheeler, Laura ;
    Omar, Meera
    2022-03-01 | PDF
    This research focuses on the impact of greater rates of adoption of higher fuel-economy vehicles and electric vehicles (EVs) on anticipated motor fuel receipts from 2022 through 2050. We find that motor fuel consumption has increased in Georgia over the 2000–2019 period, but it has fallen on a per capita basis. Also, during this time, the trend in ...
  • Continued Monitoring of the VarinaEnon Bridge Estimation of Effective Prestress
    Continued Monitoring of the Varina-Enon Bridge: Estimation of Effective Prestress
    Lindley, Seth ;
    Brodsky, Rachel
    2022-03-01 | PDF
    Prestress loss due to creep, shrinkage, and relaxation can cause serviceability issues, and in the case of structures post-tensioned with unbonded tendons, can reduce the flexural capacity. The accurate estimation of prestress losses is vital for making good decisions about the remaining life of a structure. The Varina-Enon Bridge is a post-tension ...
  • Overview of Motor Vehicle Crashes in 2020
    Overview of Motor Vehicle Crashes in 2020
    Stewart, Timothy
    2022-03-01 | PDF
    This technical report provides an overview of motor vehicle crashes in 2020. There were 38,824 people killed in motor vehicle traffic crashes on U.S. roadways during 2020, a 6.8-percent increase from 36,355 fatalities in 2019, or 2,469 more people killed in traffic crashes in 2020. The estimated number of people injured on our roadways decreased in ...
  • Travel Demand Modeling Methodology Recommendations for the Link21 Program
    Travel Demand Modeling Methodology Recommendations for the Link21 Program
    Circella, Giovanni ;
    Sun, Ran
    2022-03-01 | PDF
    This project aims to provide recommendations on the methodology and design specifications for the travel demand model to be built for the Link21 program in the Northern California megaregion. The Link21 program is a major rail investment program that will considerably improve and upgrade the passenger rail services in the Northern California megare ...
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