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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 3861 - 3880 of 36011 results
  • Division of Engineering Research OnCall Services Task 7 Durability of Anchorage Pourbacks and Improvements
    Division of Engineering Research On-Call Services Task 7: Durability of Anchorage Pour-backs and Improvements
    Tatum, Garrett ;
    Brenkus, Natassia
    2021-02-01 | PDF
    Pour-back materials are integral to the corrosion protection of post-tensioning anchorages, where all prestressing force is delivered. Two common grout materials and surface preparation techniques were investigated to assess the quality of the bond between the pour-back and the primary concrete member with regards to susceptibility to chloride intr ...
  • Evaluation of UltraHighPerformance Concrete for use in Bridge Connections and Repair
    Evaluation of Ultra-High-Performance Concrete for use in Bridge Connections and Repair
    Floyd, Royce ;
    Volz, Jeffery S.
    2021-02-01 | PDF
    The project described in this report evaluated available proprietary ultra-high performance concrete (UHPC) materials and UHPC mix designs made with local materials for applicability to bridge joint installation and repair in Oklahoma and developed recommendations for continued usage of UHPC in bridge construction in Oklahoma. Phase 1 of the projec ...
  • Mitigating Seasonal Movement at Culvert and Utilities
    Mitigating Seasonal Movement at Culvert and Utilities
    Marti, Mike ;
    Bitzan, Nico
    2021-02-01 | PDF
    Over the past few years, the Local Road Research Board (LRRB) has developed several resources to address and mitigate issues associated with seasonal movement (heaving and depressions). The focus of this document is to specifically address seasonal movements at culverts and utilities. This document synthesizes several of the earlier resources: Fros ...
  • Older Adults New Mobility and Automated Vehicles
    Older Adults, New Mobility, and Automated Vehicles
    Fraade-Blanar, Laura ;
    Larco, Nico
    2021-02-01 | PDF
    This report explores how older adults may be affected by the introduction of automated vehicles (AVs). It focuses on highly automated Level 4 AVs, self-driving vehicles that require no human supervision as long as certain conditions are met. It is based on information gathered from a literature review, interviews with subject matter experts, and a ...
  • Modulus and Dynamic Cone Penetrometer Data Collection for FullDepth Reclamation Projects
    Modulus and Dynamic Cone Penetrometer Data Collection for Full-Depth Reclamation Projects
    Tompkins, Derek
    2021-02-01 | PDF
    This field study involved falling-weight deflectometer (FWD) and dynamic cone penetrometer (DCP) testing on Minnesota roads using full-depth reclamation (FDR) base layers. The study also included basic back calculation analysis of collected FWD data using TONN2010. This initial analysis found that FDR layers had an average stiffness, or elastic mod ...
  • Cold Central Plant Recycling CCPR National Road Research Alliance NRRA
    Cold Central Plant Recycling (CCPR) – National Road Research Alliance (NRRA)
    Tompkins, Derek ;
    Zammarchi, Mattia
    2021-02-01 | PDF
    This National Road Research Alliance (NRRA) study of MnROAD cold central-plant recycling (CCPR) sections investigated various design options for cold central plant recycling (CCPR) in low-volume road applications, where local engineers or contractors may rely on a stockpiled, single-source recycled asphalt pavement (RAP) as a quality cold-recycled ...
  • Maturity Measurements in RapidSetting Concretes
    Maturity Measurements in Rapid-Setting Concretes
    Sorensen, Andrew D. ;
    Langford, Ryan Nicholas
    2021-02-01 | PDF
    With increased degradation of traffic infrastructure, the need for fast and efficient repair work is becoming increasingly important. Lane closures impede traffic flow and result in congestion. To further limit the amount of time lane closures are needed for repair work, calcium sulfoaluminate (CSA) cement concrete has become an increasingly popula ...
  • Evaluating Innovative Financing Mechanisms for the California HighSpeed Rail Project
    Evaluating Innovative Financing Mechanisms for the California High-Speed Rail Project
    Chandra, Shailesh ;
    Thai, Timothy
    2021-02-01 | PDF
    Millions of dollars are involved in high-speed rail (HSR) infrastructure construction and maintenance. Large-scale projects like HSR require funding from a variety of avenues beyond those available through public monies. Although HSR serves the general public’s mobility needs, any funds (whether State or Federal) flowing from the public exchequer u ...
  • Sources of Highway Litter in Utah
    Sources of Highway Litter in Utah
    Chamberlin, Robert ;
    Lincoln, Troy
    2021-02-01 | PDF
    The research described in this report was undertaken at the request of UDOT in order to estimate the sources and major contributors to highway litter in Utah. The research involved outreach to each of the four UDOT Regions to understand the issues with highway litter and litter cleanup. Nine highway sites were selected for a detailed litter survey. ...
  • NonInvasive Detection and Identification of Eastern Hellbender in Ohio Surface Waters Using Environmental DNA
    Non-Invasive Detection and Identification of Eastern Hellbender in Ohio Surface Waters Using Environmental DNA
    Wendell, David ;
    Esfandiari, Leyla
    2021-02-01 | PDF
    This research documents the development and application of an eDNA detection method for Cryptobranchus allegeniensis, or Eastern Hellbender in Ohio surface waters. The purpose of this method is to enable safe, non-invasive and convenient survey strategy for these endangered animals. The DNA amplification target is the Hellbender mitochondrial genom ...
  • Evaluation of CostEffective Alternative Designs for Rural Expressway Intersections
    Evaluation of Cost-Effective Alternative Designs for Rural Expressway Intersections
    Molan, Amirarsalan Mehara ;
    Howard, Jonathan
    2021-01-31 | PDF
    Despite numerous studies demonstrating the effectiveness of Restricted Crossing U-Turn (RCUT) intersection design, its implementation remains uneven and close to zero in some large states, including California. This research provides a comprehensive framework to estimate the operational and safety performance of future RCUT designs in California. T ...
  • Sustainable and Healthy Communities Through Integrating Mobility Simulations in the Urban Design Process
    Sustainable and Healthy Communities Through Integrating Mobility Simulations in the Urban Design Process
    Dogan, Timur ;
    Samaranayake, Samitha
    2021-01-27 | PDF
    Rapid urbanization and new global construction estimated to be 250x NYC by 2050 is increasing traffic congestion, pollution, and related health threats. Thus, it is imperative that we develop new modeling capabilities that allow urban designers to quantify the performance of mobility solutions, sustainability, public health impacts, pedestrian ther ...
  • Truck Platooning Effects on Girder Bridges
    Truck Platooning Effects on Girder Bridges
    Steelman, Joshua S. ;
    Puckett, Jay A.
    2021-01-27 | PDF
    Truck platooning – digitally linking two or more trucks to travel in a closely spaced convoy – is increasingly used to save fuel, and reduce driver work and road congestion. Currently, the platoon load effects with several constant headways on bridges have been evaluated and compared to AASHTO design and legal loads. However, reliability assessment ...
  • Get More Out of Variable Speed Limit (VSL) Control: An Integrated Approach to Manage Traffic Corridors with Multiple Bottlenecks [supporting datasets]
    Gao, Hang ;
    Cheng, Shenyang
    2021-01-25 | ZIP
    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 ...
    Dataset Supporting Files
  • Order Level Optimization in Inventory Management Using Arena Simulation Model
    Order Level Optimization in Inventory Management Using Arena Simulation Model
    Mitrović, Milica ;
    Popović, Dražen
    2021-01-25 | PDF
    By adequately managing inventories, companies adjust demand and supply over time to provide the necessary goods to meet customer requirements and make a profit. A simulation is a great tool for optimizing inventory management by examining system behavior in a variety of settings. This paper presents a simulation model developed in ARENA software to ...
  • COVID19s Effects on The Future of Transportation
    COVID-19’s Effects on The Future of Transportation
    Polzin, Steven ;
    Choi, Tony
    2021-01-14 | PDF
    The COVID-19 pandemic has greatly affected the nation’s transportation users and providers since February of 2020. Urgent questions arise: how will the pandemic affect the long-term future of transportation in the United States and how will the U.S. Department of Transportation and other public and private concerns craft their policies and investme ...
  • Backcalculation of Dynamic Modulus from Falling Weight Deflectometer Data
    Backcalculation of Dynamic Modulus from Falling Weight Deflectometer Data
    Kim, Y Richard ;
    Zeng, Zhe
    2021-01-12 | PDF
    The Mechanistic-Empirical Pavement Design Guide (Pavement ME Guide) and its related software, AASHTOWare Pavement ME Design, have been widely used in the asphalt pavement community. The Guide proposes three analysis levels for highway agencies to use for rehabilitation design. However, as these methods were developed in the early 2000s, certain asp ...
  • Davis Amtrak Station Pilot Project Evaluation: Informing Long Term Solutions to the Davis Amtrak Station Access Barriers [supporting datasets]
    Pike, Susan
    ORCID ICON IMG
    2021-01-11 | ZIP
    This study investigates barriers to accessing the Davis Amtrak Station to inform a program designed to increase access to the station with on-demand alternatives. The program aims to decrease private vehicle use to access the station and for travel to locations outside of Davis through partnerships with a carpool/rideshare app, as well as a ridehai ...
    Dataset Supporting Files
  • Annual Technology Transfer Report FY 2019
    Annual Technology Transfer Report FY 2019
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2021-01-08 | PDF
    Every year, the Department of Commerce (DOC) submits a Federal Laboratory T2 Fiscal Year Summary Report to the President and the Congress in accordance with 15 U.S.C. 3710(g)(2). The report summarizes the implementation of technology transfer authorities established by the Technology Transfer Commercialization Act of 2000 (Pub. L. 106-404) and othe ...
  • Work Zone Safety Improvements Using Automated Injury Data Collection
    Work Zone Safety Improvements Using Automated Injury Data Collection
    Fyhrie, Patricia B ;
    Ji, Ankyd
    2021-01-07 | PDF
    This research study collected data from approximately 39,000 traffic collision reports including diagrams and narratives for years 2011 through 2017. These reports had to be tracked down, scanned, creating image files made of the diagrams and organizing the data into a searchable database. Furthermore, the narrative portions of each report needed t ...
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