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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 5901 - 5920 of 36958 results
  • Development of LongTerm Aging Protocol for Implementation of the Illinois Flexibility Index Test IFIT
    Development of Long-Term Aging Protocol for Implementation of the Illinois Flexibility Index Test (I-FIT)
    Al-Qadi, Imad L ;
    Ozer, Hasan
    2019-08-01 | PDF
    Index Test (I-FIT) The objective of this study was to evaluate long-term aging effects on asphalt mixtures using the Illinois Flexibility Index Test (I-FIT) and to develop a corresponding long-term aging protocol. The study recommended the use of the forced-draft oven as the aging equipment because of its availability, feasibility, practicability, ...
  • Development of a Mobile Navigation Smartphone Application for Seniors in Urban Areas Urban Connector
    Development of a Mobile Navigation Smartphone Application for Seniors in Urban Areas Urban Connector
    Cheu, Ruey Long ;
    Villanueva-Rosales, Natalia
    2019-08-01 | PDF
    Many seniors face mobility issues and lifestyle changes. Switching from driving alone to carpooling, taking a taxi or public transportation are some common examples. Seniors need information about traffic congestion and available alternative means of transportation to keep attending their daily activities. However, there are not enough tools to ass ...
  • Transit Operators in Metropolitan Transportation Decision Making
    Transit Operators in Metropolitan Transportation Decision Making
    Sciara, Gian-Claudia
    ORCID ICON IMG
    2019-08-01 | PDF
    This research examines the current institutional factors influencing public transit investment across metropolitan areas. Specifically, it explores federal efforts in recent transportation authorization laws and administrative regulations to bolster transit agency representation on the boards of metropolitan planning organizations (MPOs). Against t ...
  • Evaluating the Effectiveness of Freshwater Mussel Mitigation Strategies Final Report
    Evaluating the Effectiveness of Freshwater Mussel Mitigation Strategies: Final Report
    Schwalb, Astrid ;
    Rodriguez, David
    2019-08-01 | PDF
    Relocation of mussels is applied as a mitigation strategy for potential impacts on threatened mussel species resulting from bridge construction or repairs. Demonstrably efficient surveys are required to document the distribution and abundance of mussels within the potentially impacted area to enable relocation. There is increased interest in propag ...
  • How Locals Need To Prepare for the Future of V2VV2I Connected Vehicles
    How Locals Need To Prepare for the Future of V2V/V2I Connected Vehicles
    Parikh, Gordon ;
    Duhn, Melissa
    2019-08-01 | PDF
    Connected and Automated Vehicles (CAVs) are expected to affect the foundations of transportation operations and roadway maintenance as they become more prevalent on the roadways. This report is an effort to address this complex subject for the various owners, agencies and stakeholders involved in traffic operations. It discusses the connected vehic ...
  • Evaluation of Landslides along Alabama Highways
    Evaluation of Landslides along Alabama Highways
    Montgomery, Jack ;
    Knights, Michelle
    2019-08-01 | PDF
    Slope stability management systems (SSMSs) have been developed by multiple state transportation agencies to assess landslides adjacent to highways and aide in the effective allocation of resources for slope and/or roadway repairs. SSMSs catalog and analyze slope failures through the use of three main components: a landslide data collection system, ...
  • Development of a ThreeDimensional Laser Scanning Prototype for Pavement Preservation Applications
    Development of a Three-Dimensional Laser Scanning Prototype for Pavement Preservation Applications
    Kouchaki, Sareh ;
    Roshani, Hossein
    2019-08-01 | PDF
    The connection between the pavement friction and surface macro- and micro-texture makes pavement texture a vital topic for highway agencies and state Departments of Transportation to address. Accordingly, measuring surface texture is of prime importance in pavement preservation applications. Currently, most highway agencies rely on subjective measu ...
  • Accelerated Load Testing of Geosynthetic Base ReinforcedStabilized Unpaved and Pavement Test Sections
    Accelerated Load Testing of Geosynthetic Base Reinforced/Stabilized Unpaved and Pavement Test Sections
    Abu-Farsakh, Murad Y. ;
    Chen, Qiming
    2019-08-01 | PDF
    This research study aims at evaluating the benefits of using geosynthetics to reinforce/stabilize base aggregate layer/subgrade in pavements under repeated loading test conditions. For this purpose, a total of six 80-ft long and 13 ft wide full-scale test lane sections were constructed, among which two sections were reinforced by one or two layers ...
  • Probability of Detection Study for Visual Inspection of Steel Bridges Volume 2Full Project Report
    Probability of Detection Study for Visual Inspection of Steel Bridges: Volume 2—Full Project Report
    Connor, Robert J. ;
    Campbell, Leslie E.
    2019-08-01 | PDF
    An inspector’s ability to correctly identify surface and internal defects in steel bridge components is critical to protecting public safety. Ensuring that inspectors are properly trained and adequately equipped to detect these defects in locations that are difficult to access and/or in unfavorable environmental conditions must be a high priority. ...
  • School Crossing Guard Programs and School Walking Route Maps
    School Crossing Guard Programs and School Walking Route Maps
    Chang, Kevin
    ORCID ICON IMG
    2019-08-01 | PDF
    Over the last 50 years, the preferred mode of travel of school children across the United States has shifted away from walking and bicycling. In 1969, nearly 50 percent of children walked or biked to school, including 89 percent of those living within one mile of their destination. By 2009, fewer than 15 percent walked or biked, representing only 3 ...
  • Evaluate Travel and Economic Impacts of Texas Freight Corridor Projects
    Evaluate Travel and Economic Impacts of Texas Freight Corridor Projects
    Jiang, Nan ;
    Wathall, Rydell
    2019-08-01 | PDF
    The main objective of this project is to support Texas Department of Transportation's (TxDOT’s) decision-making by predicting the network-wide travel impacts of proposed or considered freight corridor projects and estimating their costs and economic benefits to the state. Chapter 2 of this report provides an overview of the framework created under ...
  • NextGeneration Transit System Design During a Revolution of Shared Mobility
    Next-Generation Transit System Design During a Revolution of Shared Mobility
    Fan, Yueyue ;
    Zhang, Yunteng
    2019-08-01 | PDF
    Ideally, public transit, by moving more people using fewer vehicles, serves as a backbone of a transportation system. However, most transit systems in the United States suffer from low ridership and high operating costs, thus they provide a significantly compromised mobility service to the transportation system users. Under current transit system d ...
  • Guidance for Enhanced Pedestrian Treatments Within ReducedSpeed School Zones RSSZS
    Guidance for Enhanced Pedestrian Treatments Within Reduced-Speed School Zones (RSSZS)
    Chamberlin, Robert ;
    Locquaio, Jem
    2019-08-01 | PDF
    UDOT receives requests from Regional Traffic Engineers, counties, school districts and municipalities to assist in providing safe pedestrian crossings at crosswalks within Reduced-Speed School Zones (RSSZs) that have significant pedestrian crossing demand outside of school crossing periods. Guidance is necessary for traffic engineers to select appr ...
  • Highly Abrasionresistant and Longlasting Concrete
    Highly Abrasion-resistant and Long-lasting Concrete
    Liu, Jenny Hsing-I ;
    Murph, Diane
    2019-08-01 | PDF
    Studded tire usage in Alaska contributes to rutting damage on pavements resulting in high maintenance costs and safety issues. In this study binary, ternary, and quaternary highly-abrasion resistant concrete mix designs, using supplementary cementitious materials (SCMs), were developed. The fresh, mechanical and durability properties of these mix d ...
  • Quality Assurance Review of Intersection Lighting Retrofits
    Quality Assurance Review of Intersection Lighting Retrofits
    Lin, Pei-Sung ;
    Wang, Zhenyu
    2019-08-01 | PDF
    To effectively reduce fatal pedestrian and traffic crashes in Florida, the Florida Department of Transportation (FDOT) is taking a robust approach towards adequate lighting for pedestrians. There are more than 2,000 signalized intersection lighting retrofits currently underway. They will be completed by 2021. New and reconstructed signalized inters ...
  • Metropolitan Planning Organization MPO and Transit Agency Planning Coordination in Florida
    Metropolitan Planning Organization (MPO) and Transit Agency Planning Coordination in Florida
    Pessaro, Brian ;
    Kramer, Jeffrey H.
    2019-08-01 | PDF
    The purpose of this study was to benchmark the current level of coordination and cooperation between Florida Metropolitan Planning Organizations (MPOs) and transit agencies vis a vis the long range transportation plan (LRTP) and transit development plan (TDP). The impetus for the study was historical, albeit anecdotal, reports of inconsistency betw ...
  • Preparing for Progress Establishing Guidelines for the Regulation Safe Integration and Equitable Usage of Dockless Electric Scooters in American Cities
    Preparing for Progress: Establishing Guidelines for the Regulation, Safe Integration, and Equitable Usage of Dockless Electric Scooters in American Cities
    Wood, James ;
    Bradley, Samantha
    2019-08-01 | PDF
    Personal electric scooters (also called e-scooters) have quickly gained attention in Western cities as a novel means of transportation. As community leaders seek a new generation of mobility options, e-scooters represent great promise but also considerable complexity. These privately-funded vehicles operate generally without much regulation, and ma ...
  • Implement Balanced Asphalt Mix Design in Oklahoma
    Implement Balanced Asphalt Mix Design in Oklahoma
    Cross, Stephen A. ;
    Li, Joshua
    2019-08-01 | PDF
    The objective of this study was to evaluate selected ODOT mixtures to assist with determining test procedures, specifications and special provisions for evaluation and eventual adaptation of a BMD procedure for ODOT. The test plan was developed by ODOT and consisted of evaluating I-FIT test results from 31 existing mixes and I-FIT and Ideal CT Inde ...
  • Performance Evaluation of Inverted Tee IT Bridge System
    Performance Evaluation of Inverted Tee (IT) Bridge System
    Martindale, Garret ;
    Watson, Daniel
    2019-08-01 | PDF
    The Inverted Tee (IT) girder bridge system was originally developed in 1996 by the University of Nebraska–Lincoln (UNL) researchers and Nebraska Department of Transportation (NDOT) engineers. This bridge system currently accounts for over 110 bridges in Nebraska used for both state highways and local county roads. Extensive longitudinal and transve ...
  • Synthesis of Precast Column Designs for Texas Bridges Project Summary
    Synthesis of Precast Column Designs for Texas Bridges [Project Summary]
    Murcia-Delso, Juan ;
    Bayrak, Oguzhan
    2019-08-01 | PDF
    Using prefabricated bridge elements and systems minimizes on-site operations and closure times during bridge construction and contributes to improving durability and reducing the environmental impact of construction. Prefabrication of bridge columns has been very limited as compared to bridge superstructures and bent caps. Nevertheless, some states ...
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