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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 2941 - 2960 of 35959 results
  • Comprehensive Performance Assessment of Passive Crowdsourcing for Counting Pedestrians and Bikes
    Comprehensive Performance Assessment of Passive Crowdsourcing for Counting Pedestrians and Bikes
    Cheng, Wen ;
    Zhang, Yongping
    2022-01-01 | PDF
    Individuals who walk and cycle experience a variety of health and economic benefits while simultaneously benefiting their local environments and communities. It is essential to correctly obtain pedestrian and bicyclist counts for better design and planning of active transportation-related facilities. In recent years, crowdsourcing has seen a rise i ...
  • Constructability and Durability of Concrete Pavements
    Constructability and Durability of Concrete Pavements
    Trejo, David ;
    Vaddey, Naga Pavan
    2022-01-01 | PDF
    Concrete for pavements must be proportioned so that the concrete is economical and durable. Because ordinary Portland cement (OPC) is the most costly component and is generally less durable than the aggregates, the OPC should be minimized. OPC significantly contributes to CO₂ during manufacturing. Therefore, minimizing the OPC will also make the co ...
  • Assess the Effectiveness of Type 2 and Type 3 Safety Vests for Day and Night Use Phase 2
    Assess the Effectiveness of Type 2 and Type 3 Safety Vests for Day and Night Use – Phase 2
    Ash, John E ;
    Ma, Jiaqi
    2022-01-01 | PDF
    Work zones are an essential component of any state transportation agency’s construction and maintenance operations. As such, agencies apply numerous practices in order to keep their workers safe during construction operations. These strategies typically fall under the following categories: work zone traffic control (e.g., arrow boards, variable mes ...
  • Pile Driving Setup for Ohio Soils Final Report
    Pile Driving Setup for Ohio Soils: Final Report
    Bilgin, Ömer ;
    Alzahrani, Saeed
    2022-01-01 | PDF
    An increase in pile resistance over time after installation, due to an increase in soil resistance, is referred to as pile setup. Until recently, pile setup was not commonly considered in ODOT’s standard driven pile design procedures. If substantial pile driving losses are encountered during pile installation, then either pile driving is stopped fo ...
  • The Future of Transportation and Urban Planning A California 100 Report on Policies and Future Scenarios
    The Future of Transportation and Urban Planning: A California 100 Report on Policies and Future Scenarios
    Wasserman, Jacob L. ;
    Taylor, Brian D.
    2022-01-01 | PDF
    Nearly every aspect of social, economic, and political life in California is linked by its transportation systems. These systems can be seamless and somewhat transparent when they work well, but their failings can be glaring and deeply problematic when they leave people, goods, or places behind. Debates over how to address the state’s long-standing ...
  • 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 ...
  • Taming the Data in the Internet of Vehicles
    Taming the Data in the Internet of Vehicles
    Tayeb, Shahab
    ORCID ICON IMG
    2022-01-01 | PDF
    As an emerging field, the Internet of Vehicles (IoV) has a myriad of security vulnerabilities that must be addressed to protect system integrity. To stay ahead of novel attacks, cybersecurity professionals are developing new software and systems using machine learning techniques. Neural network architectures improve such systems, including Intrusio ...
  • 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 ...
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