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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 4281 - 4300 of 36908 results
  • Division of Engineering Research on Call ROC Agreement 31796 Task 7 Service Evaluation of Highway Structures With SoilBearing Spread Footings
    Division of Engineering Research on Call (ROC) Agreement 31796 Task 7 – Service Evaluation of Highway Structures With Soil-Bearing Spread Footings
    Nusairat, Jamal ;
    Tarawneh, Bashar
    2021-02-01 | PDF
    The Ohio Department of Transportation (ODOT) needs to evaluate highway structures’ performance supported on spread footings bearing on soils. This evaluation’s outcomes are recommendations for future use of spread footings and potential limitations on their use. The project team completed the following tasks: 1. Reviewed the documented performance ...
  • I80 Hybrid Regulatory Speed Limit Signing Design and VSL System Evaluation
    I-80 Hybrid Regulatory Speed Limit Signing Design and VSL System Evaluation
    Azin, Bahar ;
    Yang, Xianfeng (Terry)
    2021-02-01 | PDF
    To improve traffic safety on a section of I-80 (through the mountains east of Salt Lake City) that experiences frequent periods of difficult weather, the Utah Department of Transportation (UDOT) implemented a Variable Speed Limit (VSL) zone (from MP 128.0 to MP 141.0 in both directions) using regulatory hybrid Changeable Message Signs (CMS). Origin ...
  • Continuous Snow Temperature Monitoring for the Idaho Highway 21 Avalanche Program
    Continuous Snow Temperature Monitoring for the Idaho Highway 21 Avalanche Program
    Youngblood, Peter ;
    Marshall, Hans-Peter
    2021-02-01 | PDF
    Predicting metamorphism within seasonal snowpacks is critical for avalanche forecasting and runoff timing as it relates to water supply management. Snowpack temperature gradients play a key role in snow metamorphism, and their magnitude controls how snow strength changes; therefore, they are of interest to avalanche forecasters. Before major melt, ...
  • Tsunami Loads on Straight and Skewed Bridges Part 1 Experimental Investigation and Design Recommendations
    Tsunami Loads on Straight and Skewed Bridges – Part 1: Experimental Investigation and Design Recommendations
    Istrati, Denis ;
    Buckle, Ian G.
    2021-02-01 | PDF
    This report presents the results of a large-scale experimental investigation of tsunami impact on straight and skewed bridges. The 1:5 scale specimens had realistic structural components and dynamic properties, and were subjected to a range of simplified unbroken solitary waves and more realistic bores. The unique experimental data revealed: (a) th ...
  • Develop an Improved SDDOT Construction Cost Index
    Develop an Improved SDDOT Construction Cost Index
    Jeong, David H. ;
    Shrestha, K. Joseph
    2021-02-01 | PDF
    A highway construction cost index (HCCI) is an indicator of the purchasing power of a highway agency. Highway agencies can monitor their construction market conditions using HCCIs to make various financial planning decisions. The main goal of this study is to modernize the HCCI system of South Dakota DOT by developing an enhanced HCCI calculation a ...
  • Drivers Mental Models of Advanced Vehicle Technologies A Proposed Framework for Identifying and Predicting Operator Errors
    Driver’s Mental Models of Advanced Vehicle Technologies: A Proposed Framework for Identifying and Predicting Operator Errors
    Pradhan, Anuj K. ;
    Pai, Ganesh
    2021-02-01 | PDF
    Advanced vehicle technologies are increasingly more accessible and available in vehicles. These current and future systems, despite promising added safety, convenience, and efficiency to drivers and road users, have an inherently higher level of complexity than the driving systems that most drivers are used to operating. In order to maximize the pr ...
  • Safety Impact Evaluation of a NarrowAutomated VehicleExclusive Reversible Lane on an Existing Smart Freeway
    Safety Impact Evaluation of a Narrow-Automated Vehicle-Exclusive Reversible Lane on an Existing Smart Freeway
    Machiani, Sahar Ghanipoor ;
    Jahangiri, Arash
    2021-02-01 | PDF
    This study fills the gap in the limited research on the effect of emerging Automated Vehicle (AV) technology on infrastructure standards. The main objective of this research is to evaluate implications of an innovative infrastructure solution, exclusive AV lanes, for safe and efficient integration of AVs into an existing transportation system. Exam ...
  • Structural Identification and Damage Detection in Bridges Using Wave Method and Uniform Shear Beam Models A Feasibility Study
    Structural Identification and Damage Detection in Bridges Using Wave Method and Uniform Shear Beam Models: A Feasibility Study
    Rahmani, Mehran ;
    Naik, Manan
    2021-02-01 | PDF
    This report presents a wave method to be used for the structural identification and damage detection of structural components in bridges, e.g., bridge piers. This method has proven to be promising when applied to real structures and large amplitude responses in buildings (e.g., mid-rise and high-rise buildings). This study is the first application ...
  • Development Implementation and Tracking of Preventative Safety Metrics
    Development, Implementation, and Tracking of Preventative Safety Metrics
    Al-shabbani, Zamaan ;
    Ammar, Ashtarout
    2021-02-01 | PDF
    What gets measured, gets improved. With respect to the safety and health of Kentucky Transportation Cabinet (KYTC) employees, the primary metric used has been the OSHA recordable incident rate. This incident rate measures how often a Cabinet employee sustains an injury that demands more than basic first aid. This metric is important for understandi ...
  • Repair and Strengthening of Bridges in Indiana Using Fiber Reinforced Polymer Systems Volume 2 FRP Flexural Strengthening and End Region Repair Experimental Programs
    Repair and Strengthening of Bridges in Indiana Using Fiber Reinforced Polymer Systems: Volume 2 – FRP Flexural Strengthening and End Region Repair Experimental Programs
    Rich, William B. ;
    Jacobs, Robert R
    2021-02-01 | PDF
    For bridges that are experiencing deterioration, action is needed to ensure the structural performance is adequate for the demands imposed. Innovate repair and strengthening techniques can provide a cost-effective means to extend the service lives of bridges efficiently and safely. The use of fiber reinforced polymer (FRP) systems for the repair an ...
  • Deterioration of Green Conflict Paint for Bicycle Facilities
    Deterioration of Green Conflict Paint for Bicycle Facilities
    Kassem, Emad ;
    Lowry, Michael
    2021-02-01 | PDF
    Bicyclists depend on the visibility of the surrounding environment to maintain a safe travel path. Throughout the country, new types of bicycle infrastructure and pavement markings are being installed. This study used a new procedure to evaluate different pavement markings used in bike lanes. Three different paints were evaluated, including green w ...
  • Evaluating Pedestrian Crossings on HighSpeed Urban Arterials
    Evaluating Pedestrian Crossings on High-Speed Urban Arterials
    Codjoe, Julius ;
    Mitran, Elisabeta
    2021-02-01 | PDF
    The aim of this study is to provide a preliminary assessment of Louisiana’s high-speed urban arterials in terms of existing pedestrian crossing facilities and identify any associations of pedestrian crashes with the presence or lack of such pedestrian crossing facilities. In achieving this aim, several tasks were undertaken including: documenting p ...
  • 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 ...
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