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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 6541 - 6560 of 36958 results
  • Vehicle Operating Speed on Urban Arterial Roadways
    Vehicle Operating Speed on Urban Arterial Roadways
    Fitzpatrick, Kay ;
    Das, Subasish
    2019-01-01 | PDF
    This research explored (1) the relationship between suburban vehicle operating speed and roadway characteristics, especially the presence of bicyclists and (2) whether crowdsourced speed data could be used to estimate the unconstrained speed for a location. Both vehicle volume per lane and bicycle volume were found to be influential in affecting av ...
  • The Impact of the Louisiana Rail Infrastructure A System Analysis and Plan Research Project Capsule 194SS
    The Impact of the Louisiana Rail Infrastructure: A System Analysis and Plan: Research Project Capsule [19–4SS]
    Stich, Bethany ;
    Rupnow, Tyson
    2019-01-01 | PDF
    The objectives of this research include an updated mapping of Louisiana rail infrastructure with associated freight flow data; updates to the state rail plan per the Passenger Rail Investment and Improvement Act (PRIIA); determining funding sources for rail; and quantifying the current economic impact of rail in Louisiana.
  • NETC 133 Phase II Development of Implementation Plan for Unified Quality Assurance QA Processes of Precast and Prestressed Concrete Elements PCEPSE for New England
    NETC 13-3 Phase II: Development of Implementation Plan for Unified Quality Assurance (QA) Processes of Precast and Prestressed Concrete Elements [PCE/PSE] for New England
    Dave, Eshan V. ;
    Sias, Jo E
    2019-01-01 | PDF
    The use of quality assurance (QA) systems in highway infrastructure is critical to ensure durable, safe, and economical transportation operations. These processes ensure that the desired level of quality is maintained throughout the manufacturing and construction processes. For regions such as New England, a significant cost savings can be realized ...
  • Last Mile Package Delivery via Rural Transit Project Summary and Pilot Outcomes
    Last Mile Package Delivery via Rural Transit: Project Summary and Pilot Outcomes
    Elgart, Zachary ;
    Miller, Kristi
    2019-01-01 | PDF
    Rural transit districts and intercity bus carriers are an important link within Texas’ multimodal transportation system. Without such service providers, many rural residents that are transit dependent would be forced to either relocate or find other means of transportation. Furthermore, with continued growth of business to consumer e-commerce deman ...
  • A Time and a Place for Every Rider Geographic and Temporal Changes in Bay Area Transit Ridership
    A Time and a Place for Every Rider?: Geographic and Temporal Changes in Bay Area Transit Ridership
    Wasserman, Jacob ;
    Taylor, Brian D.
    2019-01-01 | PDF
    Transit ridership is on the wrong track across America. Yet until 2016, the San Francisco Bay Area appeared immune to the ridership declines plaguing most other cities. However, in 2017, Bay Area ridership began to fall, both regionwide and on almost all major transit operators. But this decline has not occurred uniformly. Thus, to help explain why ...
  • Stabilized FullDepth Reclamation Increases Roadway Strength Technical Summary
    Stabilized Full-Depth Reclamation Increases Roadway Strength [Technical Summary]
    Jahren, Charles ;
    Kohlnhofer, Guy
    2019-01-01 | PDF
    Researchers found that stabilized full-depth reclamation has produced stronger roads for commercial loads in Minnesota, and the method shows promise for uses in rural agricultural areas. How much greater the strength gained with each stabilizing agent is better understood, though not conclusively.
  • Development of an Augmented Reality Environment for Connected and Automated Vehicle Testing
    Development of an Augmented Reality Environment for Connected and Automated Vehicle Testing
    Liu, Henry X. ;
    Feng, Yiheng
    2019-01-01 | PDF
    Currently closed Connected and Automated (CAV) testing facilities, such as Mcity, merely provide empty roadways, in which test CAVs can only interact with each other and the infrastructure (e.g. traffic signals). However, a complete testing environment should also include background traffic to interact with the test CAVs. Involving real vehicles as ...
  • Requirements for Use of FieldCast Proprietary UltraHighPerformance Concrete in Florida Structural Applications
    Requirements for Use of Field-Cast, Proprietary Ultra-High-Performance Concrete in Florida Structural Applications
    Riding, Kyle A ;
    Ferraro, Christopher C.
    2019-01-01 | PDF
    Ultra-high-performance concrete (UHPC) is a groundbreaking cementitious material that has the potential for innovative structural use that makes lighter, more durable, and overall lower cost structures. Very low water-to-cementitious material ratios and high dosages of fibers are used to give UHPC high compressive strength, high tensile strength, a ...
  • Prevention of Backing Fatalities in Construction Work Zones Project Summary
    Prevention of Backing Fatalities in Construction Work Zones [Project Summary]
    Fan, Wei ;
    Carroll, Clayton
    2019-01-01 | PDF
    Construction, repair, and maintenance work zones are hazardous environments because of the dangerous combination of pedestrian workers and large trucks, bulldozers, rollers, and other moving machinery. All the workers are exposed to moving traffic near the work zone, with the risk of errant vehicles entering the work zone area.
  • Improvement of Climate Data for Use in MEPDG Calibration and Other Pavement Analysis
    Improvement of Climate Data for Use in MEPDG Calibration and Other Pavement Analysis
    Durham, Stephan A. ;
    Cetin, Bora
    2019-01-01 | PDF
    This study compares the predicted distresses of asphalt concrete (AC) and jointed plain concrete pavement (JPCP) using four different climate data sources: (1) ground-based weather station (GBWS) data, (2) the North American Regional Reanalysis (NARR) data, and (3 and 4) the Modern-Era Retrospective Analysis for Research and Applications (MERRA) ve ...
  • parkDC Penn QuarterChinatown Pricing Pilot Final Report
    parkDC: Penn Quarter/Chinatown Pricing Pilot Final Report
    Pochowski, Alek ;
    Sanders, Meredyth
    2019-01-01 | PDF
    The parkDC: Penn Quarter/Chinatown Multimodal Value Pricing Pilot used the Penn Quarter/Chinatown neighborhoods of Washington, DC as a laboratory to test state-of-the-art strategies to make it easier to find a parking space. The project provided real-time parking-availability information so customers could spend less time searching and changed park ...
  • Evaluation of the Ohio Department of Transportations Current Storm Sewer Cleaning Operations Phase II
    Evaluation of the Ohio Department of Transportation's Current Storm Sewer Cleaning Operations – Phase II
    Schneider, William H. ;
    Cutright, Teresa
    2019-01-01 | PDF
    The Ohio Department of Transportation (ODOT) is in charge of constructing, maintaining and ensuring the safety of roads within its control. Proper maintenance procedures are critical in reducing the amount of funding required to sustain long lasting and safe roads. One maintenance responsibility of ODOT is to inspect and clean the storm sewer infra ...
  • Intersection on Horizontal Curves Problems and Potential Solutions Research Project Capsule 184SA
    Intersection on Horizontal Curves: Problems and Potential Solutions: Research Project Capsule [18–4SA]
    Sun, Xiaoduan ;
    Rupnow, Tyson
    2019-01-01 | PDF
    The objectives of this project are to quantify safety performance of intersections on curves for Louisiana’s state- and locally-owned roads, determine the magnitude of the problem, identify risk factors or roadway characteristics associated with related crashes, and develop a list of possible countermeasures that target the identified risk factors.
  • Effective Production Rate Estimation Using Construction Daily Work Report Data Phase 1
    Effective Production Rate Estimation Using Construction Daily Work Report Data [Phase 1]
    Jeong, H. David ;
    Le, Chau
    2019-01-01 | PDF
    Accurate and practical production rate estimates are crucial for an accurate forecast of contract completion time. As costs of highway projects increase with time, the importance of estimating highway construction contract time has increased significantly, thereby emphasizing the need for effective production rates due to the interrelatedness betwe ...
    Supporting Files
  • Improving the Accuracy and Applicability of Kansas Traffic Data
    Improving the Accuracy and Applicability of Kansas Traffic Data
    Kondyli, Alexandra ;
    Schrock, Steven D.
    2019-01-01 | PDF
    This research investigated the accuracy and reliability of KC Scout traffic sensors in the Kansas City metropolitan area. The locations and sensors under investigation are of particular importance to the Kansas Department of Transportation (KDOT) because they regularly report accurate traffic counts to the Federal Highway Administration (FHWA). The ...
  • Transit in the Era of Shared Mobility
    Transit in the Era of Shared Mobility
    Watkins, Kari E. ;
    McDonald, Noreen
    2019-01-01 | PDF
    There are several conflicting trends in the rapidly changing transportation market, which are impacting transit ridership is varying ways. Transportation Network Companies have the potential to reduce or replace the need for auto ownership and may serve some populations better than transitional transit services, but limited survey research indicate ...
  • Modeling Bioenergy Supply Chains Feedstocks Pretreatment Integrated System Design under Uncertainty
    Modeling Bioenergy Supply Chains: Feedstocks Pretreatment, Integrated System Design under Uncertainty
    Li, Yuanzhe
    2019-01-01 | PDF
    Biofuels have been promoted by governmental policies for reducing fossil fuel dependency and greenhouse gas emissions, as well as facilitating regional economic growth. Comprehensive model analysis is needed to assess the economic and environmental impacts of developing bioenergy production systems. For cellulosic biofuel production and supply in p ...
  • Compliance with the United States Environmental Protection Agency Effluent Limitation Guidelines Turbidity Control and Surface Outlets
    Compliance with the United States Environmental Protection Agency Effluent Limitation Guidelines – Turbidity Control and Surface Outlets
    Privette III, Charles V ;
    Sawyer, Calvin
    2019-01-01 | PDF
    A goal of this research was to maximize turbidity reduction using passive polyacrylamide (PAM) applications and investigate the longevity of PAM’s effectiveness. Results indicate PAM application may provide an effective alternative for turbidity reduction where SCDOT sites discharge to waterways with sediment-related water quality standards in plac ...
  • Field Implementation of SuperWorkable FiberReinforced Concrete for Infrastructure Construction Research Summary
    Field Implementation of Super-Workable Fiber-Reinforced Concrete for Infrastructure Construction: Research Summary
    Missouri. Department of Transportation. Construction and Materials Division
    2019-01-01 | PDF
    A fiber-reinforced super-workable concrete (FR-SWC) made with 0.5% micro-macro steel fibers and 5% CaO-based expansive agent was selected for the new deck slab reconstruction of Bridge A8509. The selected FR-SWC had a targeted slump flow of 20 in. at the casting location. Multiple trial batches were performed, in collaboration with the concrete sup ...
  • Best Practices for Placing Concrete Overlays on Prestressed Slab Bridges
    Best Practices for Placing Concrete Overlays on Prestressed Slab Bridges
    Amde, A M ;
    Sharma, S.
    2019-01-01 | PDF
    The objective of this research was to identify alternatives to the Maryland Department of Transportation State Highway Administration’s (MDOT SHA's) procedure of placing cast-in-place concrete overlays on prestressed bridge decks. The current practice involves the application of a cement-sand slurry mix over the bridge deck prior to placement of ov ...
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