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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 3401 - 3420 of 36873 results
  • 2021 Cold Recycling Pilot Projects Construction and Quality Control
    2021 Cold Recycling Pilot Projects: Construction and Quality Control
    Louw, Stephanus ;
    Jones, David
    2022-01-01 | PDF
    The construction of three partial-depth recycling (PDR) pilot projects was monitored in late 2021. These studies focused on the benefits of adding supplemental aggregates to PDR materials, comparison of emulsified asphalt (EA) and foamed asphalt (FA) recycling agents in PDR applications, comparison of the gradations produced by single- and multi-un ...
  • Guardrail Evaluation for Hazards on LowVolume Rural Roadways in Kansas Using RSAP
    Guardrail Evaluation for Hazards on Low-Volume Rural Roadways in Kansas Using RSAP
    Wang, Peng ;
    Fitzsimmons, Eric J.
    2022-01-01 | PDF
    This study utilized Roadside Analysis Program Version 3 (RSAPv3) simulation because it implements previous crash statistics and could be readily updated with local data. With the help of KDOT staff, the research team synthesized traffic operation data and geometric features on rural roads in Kansas and carried out crash simulations using RSAPv3 to ...
  • Safety Pilot Model Deployment: WSU Basic Safety Messages
    University of Michigan. Transportation Research Institute
    2022-01-01 | PDF
    The Safety Pilot Model Deployment (SPMD) study was run in the Ann Arbor, MI area and involved over 2,000 vehicles. The study goal was to pilot a connected-vehicle system that included roadside units (RSUs) fixed to specific intersections and vehicle-based communication units. Data were collected from RSUs as well as vehicles. Each vehicle was equip ...
    Dataset
  • Derivation of the Empirical Bayesian Method for the Negative BinomialLindley Generalized Linear Model With Application in Traffic Safety
    Derivation of the Empirical Bayesian Method for the Negative Binomial-Lindley Generalized Linear Model With Application in Traffic Safety
    Khodadadi, Ali ;
    Tsapakis, Ioannis
    2022-01-01 | PDF
    The expected crash frequency is the long-term average crash count for a specific site. It is extensively used to systematically evaluate the crash risk associated with roadway elements. To estimate the expected crashes, the Empirical Bayesian (EB) approach is typically employed. The EB method is a computationally convenient approximation to the Ful ...
  • IncentiveBased Approach to Rebalancing a DockLess EBikeShare System for Sustainability
    Incentive-Based Approach to Rebalancing a Dock-Less E-Bike-Share System for Sustainability
    Fukushige, Tatsuya
    ORCID ICON IMG
    2022-01-01 | PDF
    The spatial mismatch between demand and supply over time is a significant concern in a bike-share service. One primary strategy to fill the mismatch is to rebalance a shared bike fleet by vans or trucks. The more vans operators use to meet the demand, the more vehicle miles traveled (VMT) the system produces, offsetting the VMT reduction benefit th ...
  • eLCAP A Web Application for Environmental Life Cycle Assessment for Pavements
    eLCAP: A Web Application for Environmental Life Cycle Assessment for Pavements
    Lea, Jon ;
    Harvey, John T
    2022-01-01 | PDF
    The California Department of Transportation (Caltrans) has a growing need to be able to quantify its greenhouse gas (GHG) emissions and the other environmental impacts of pavement operations, and to consider GHG and those other impacts in pavement management, conceptual design, design, materials selection, and construction project delivery decision ...
  • Evaluation of an Active Traffic Management System with PartTime Use of the Inside Shoulder
    Evaluation of an Active Traffic Management System with Part-Time Use of the Inside Shoulder
    Kassens-Noor, Eva ;
    Savolainen, Peter T.
    2022-01-01 | PDF
    This study investigated the performance, safety, and public percerptions on US-23 Flex route. Overall, crashes were reduced by roughly 17 percent across the entire corridor in both directions. The improvements were significantly more pronounced in the SB direction, where crashes were reduced by 34 percent overall and more than 50 percent during the ...
  • Compacted Concrete Pavement 2022
    Compacted Concrete Pavement [2022]
    Khayat, Kamal H. ;
    Farzadnia, Nima
    2022-01-01 | PDF
    The main objective of this project was to evaluate construction issues and characterize the long-term performance of compacted concrete pavement (CCP). Three CCP test cells were designed and constructed in Scott County, Missouri, as part of a larger construction project. The total pavement length was 42 ft for the three cells. Cell 1 and Cell 2 wer ...
  • Pile Driving Setup for Ohio Soils Fact Sheet
    Pile Driving Setup for Ohio Soils [Fact Sheet]
    Bilgin, Ömer ;
    Nusairat, Jamal
    2022-01-01 | PDF
    Ohio transportation projects are largely founded on three types of foundations: spread footings, drilled shafts, and driven piles. Spread footings are often used in areas where rock is near the surface or where there is competent soil and the structural loads are relatively light. Drilled shafts are almost always socketed into rock, and consequentl ...
  • Predicting Lane Utilization at Signalized Intersections in Advance of Arterial Lane Drops
    Predicting Lane Utilization at Signalized Intersections in Advance of Arterial Lane Drops
    Lunt, Camille ;
    Bassett, David
    2022-01-01 | PDF
    When a through travel lane on an arterial road is dropped shortly beyond a signalized intersection, there can be a negative impact on capacity as drivers try to preemptively merge before the intersection. This research seeks to increase understanding of the factors that impact the utilization of discontinued (short) lanes and develop standards for ...
  • WisDOT Workforce Development and Readiness Project
    WisDOT Workforce Development and Readiness Project
    Singh, Romila ;
    Qin, Xiao
    2022-01-01 | PDF
    The purpose of this project was to understand and analyze the nature of personnel gaps at the Division of Transportation System Development (DTSD) and offer recommendations on how best to address some of the gaps. The UWM-IPIT project team conducted gap analysis using a variety of methodologies: SWOT analysis, attrition analysis over time, areas of ...
  • An Integrated Intelligent Intersection Control System IIICS for Safety Improvement and Delay Minimization
    An Integrated Intelligent Intersection Control System (III-CS) for Safety Improvement and Delay Minimization
    Chang, Gang-Len ;
    Chen, Yen-Hsiang
    2022-01-01 | PDF
    The primary objectives of this research are to develop and test an Integrated Intelligent Intersection Control System (III-CS) that can concurrently address both safety and efficiency issues. Based on the dilemma zone protection system (DZPS) developed jointly by MDOT SHA and the research team, the proposed III-CS will have the following key featur ...
  • FaultFree Integrity and Continuity for Driverless Urban Vehicle Navigation with MultiSensor Integration A Case Study in Downtown Chicago
    Fault-Free Integrity and Continuity for Driverless Urban Vehicle Navigation with Multi-Sensor Integration: A Case Study in Downtown Chicago
    Nagai, Kana ;
    Spenko, Matthew
    2022-01-01 | PDF
    Driverless vehicles must operate with a safety integrity level, but urban environments degrade GNSS navigation accuracy and thereby fault-free integrity. Integration with INS helps maintain continuity, but position errors drift over time without GNSS signals. Whether modern navigation systems can provide satisfactory integrity for driverless vehicl ...
  • Optimizing Commercial Vehicle Enforcement Investments and Activities to Improve Safety and Increase Revenue Collections
    Optimizing Commercial Vehicle Enforcement Investments and Activities to Improve Safety and Increase Revenue Collections
    Howell, Brian ;
    Walton, Jennifer
    2022-01-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) owns and maintains 14 fixed weigh stations for commercial vehicle enforcement. The Kentucky State Police (KSP) is responsible for staffing these facilities to conduct enforcement, while KYTC is responsible for constructing and maintaining these facilities. Like many states, Kentucky has experienced a decli ...
  • Can Californian Households Save Money on Transportation Costs by Living in TransitOriented Developments TODs
    Can Californian Households Save Money on Transportation Costs by Living in Transit-Oriented Developments (TODs)?
    Dong, Hongwei
    2022-01-01 | PDF
    Many residents in large Californian metropolitan areas are heavily burdened by housing costs. Advocates, researchers, and elected officials in California are debating whether transit-oriented development (TOD) could be an effective tool to mitigate the housing affordability problem by increasing housing supply and reducing transportation costs in t ...
  • The Fresno State Transportation Challenge
    The Fresno State Transportation Challenge
    Wandeler, Christian ;
    Hart, Steve
    2022-01-01 | PDF
    The Fresno State Transportation Challenge uses an action civics approach to support K-12 students in developing transportation-related projects that have a positive impact on the community. In 2020 the goal was to expand, refine, and create structures to sustain the implementation of the Transportation Challenge across subsequent years. As a result ...
  • Development of a Bat Guano and Acoustic Sampling Testing Protocol to Identify Species Occupying Virginia Department of Transportation Bridges
    Development of a Bat Guano and Acoustic Sampling Testing Protocol to Identify Species Occupying Virginia Department of Transportation Bridges
    Taylor, Hila ;
    Powers, Karen E
    2022-01-01 | PDF
    Over half of Virginia’s extant bat species, including six imperiled bat species, have been documented as using bridges as day or night roosts. To prevent or minimize harm to these species, the Virginia Department of Transportation (VDOT) performs surveys to detect bat use in transportation structures when essential infrastructure maintenance must o ...
  • WisDOT Research Program 2022 Annual Report
    WisDOT Research Program: 2022 Annual Report
    Wisconsin. Department of Transportation
    2022-01-01 | PDF
    This is a report of research and technology transfer activities carried out by the Wisconsin Department of Transportation through the Part B research portion of the State Planning and Research Program of the Federal Highway Administration, U.S. Department of Transportation. The report describes activities during Federal Fiscal Year 2022, covering O ...
  • 20 Tips to Up Your Agencys Social Media Game
    20 Tips to Up Your Agency’s Social Media Game
    Zan Associates
    2022-01-01 | PDF
    Whether you're a social media newbie or a communications professional, there are always new trends, technology, and platforms to learn, and it can be overwhelming. This guide will help the average local transportation practitioner cut through the noise and identify best practices to more effectively communicate with local residents on social media ...
  • National Roadway Safety Strategy
    National Roadway Safety Strategy
    United States. Department of Transportation. Office of the Secretary of Transportation
    2022-01-01 | PDF
    The United States Department of Transportation National Roadway Safety Strategy (NRSS) outlines the Department’s comprehensive approach to significantly reducing serious injuries and deaths on our Nation’s highways, roads, and streets. This is the first step in working toward an ambitious long-term goal of reaching zero roadway fatalities. Safety i ...
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