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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 4881 - 4900 of 36020 results
  • Seal Coat Specification Recommendations
    Seal Coat Specification Recommendations
    Goehl, Darlene
    2020-03-01 | PDF
    An extensive literature review was conducted in this project, including review of Texas Department of Transportation (TxDOT), national, and international seal coat specifications. Based on the findings and results from prior tasks, several specification changes are recommended. This report contains the proposed specifications and a summary of the k ...
  • Quality Assurance Review of Intersection Lighting Retrofits Summary
    Quality Assurance Review of Intersection Lighting Retrofits [Summary]
    Lin, Pei Sung
    2020-03-01 | PDF
    University of South Florida researchers measured nighttime illumination in crosswalks at intersections with retrofitted lighting. Their method employed a novel combination of devices to improve efficiency and safety.
  • Synthesis of Repair Practices of Damaged PrecastPrestressed Concrete Girders
    Synthesis of Repair Practices of Damaged Precast/Prestressed Concrete Girders
    Kodsy, Antony ;
    Morcous, George
    2020-03-01 | PDF
    Bridge girders are constantly subjected to various types of damage during their service life. There is currently limited knowledge or guidelines provided by the NDOT Bridge Office Policies and Procedures (BOPP) regarding the assessment and repair procedures of damaged precast/prestressed concrete girders. This report aims to develop a comprehensive ...
  • Performance of a GRSIBS Bridge Abutment Colorado Study
    Performance of a GRS-IBS Bridge Abutment: Colorado Study
    Chang, Nien-Yin ;
    Nghiem, Hien
    2020-03-01 | PDF
    The replacement of the CDOT Region 1 Twin Bridge over Smith Road and Union Pacific Rail Road (UPRR) on I-70 provided an excellent opportunity for the performance evaluation of GRS (geosynthetically reinforced soils) abutment. The performance of the GRS abutment was measured using SAA (shape accel array) for lateral deformation and vertical settleme ...
  • TimeLapse Infrared Thermography Applied to Concrete Bridge Deck Inspection Surveys
    Time-Lapse Infrared Thermography Applied to Concrete Bridge Deck Inspection Surveys
    Chase, Steven B. ;
    Anderson, Chad M
    2020-03-01 | PDF
    The Federal Highway Administration mandates that all [bridge] structures in its inventory are to be inspected every two years. Consequently, deck surveys are conducted to identify unseen damage within them. A significant number of bridges in Virginia have concrete decks with an overlay. Methods commonly deployed on these decks, are limited in the q ...
  • Optimal Design of Stormwater Basins With BioSorption Activated Media Bam in Karst Environments Phase II Field Testing of BMPs
    Optimal Design of Stormwater Basins With Bio-Sorption Activated Media (Bam) in Karst Environments – Phase II: Field Testing of BMPs
    Kibler, Kelly M ;
    Chang, Ni-Bin
    2020-03-01 | PDF
    Two new designs of stormwater Best Management Practices (BMPs) using Biosorption Activated Media (BAM) were developed, implemented, and tested: (1) blanket filters, located within a stormwater management facility, and (2) vertical infiltration reactors. The blanket filter, comprised of a 1-ft top-soil layer and 3-ft BAM layer, removed 60%-66% of TN ...
  • Development of Pavement Condition Forecasting for WebBased Asset Management for County Governments
    Development of Pavement Condition Forecasting for Web-Based Asset Management for County Governments
    Wentz, Bradley
    2020-03-01 | PDF
    This application was developed to expand a low-cost asset inventory program called Geographic Roadway Inventory Tool (GRIT) to include roadway forecasting based on the American Association of State Highway and Transportation Officials (AASHTO) 93 model with inventory, pavement condition, and traffic forecasting data. Existing input data from GRIT s ...
  • Pilot Implementation for Preventing Incorrect Turns at HighwayRail Grade Crossings Summary
    Pilot Implementation for Preventing Incorrect Turns at Highway-Rail Grade Crossings [Summary]
    Lin, Pei-Sung ;
    Bradley, Catherine
    2020-03-01 | PDF
    Incorrect turns onto railroad tracks may occur if a highway-rail grade crossing is close to an intersection or a freeway on-ramp. This project aimed to evaluate three low-cost countermeasures to prevent incorrect turns onto railroad tracks: (1) elimination of potentially misleading pavement markings and signs before railroad crossings, (2) implemen ...
  • InSitu Scour Testing Device ISTD State Demonstrations of Field Soil Tests Gulf Islands National Seashore MS
    In-Situ Scour Testing Device (ISTD), State Demonstrations of Field Soil Tests, Gulf Islands National Seashore, MS
    United States. Federal Highway Administration
    2020-03-01 | PDF
    Emerging ISTD technology uses an innovative erosion head that more accurately measures soil erosion resistance, resulting in more cost-effective foundation designs and greater reliability and resiliency in bridge performance.
  • Feasibility of Using Video Image Detectors for Ramp Signal Operations and Performance Monitoring Project Summary
    Feasibility of Using Video Image Detectors for Ramp Signal Operations and Performance Monitoring [Project Summary]
    Gan, Albert
    2020-03-01 | PDF
    Florida International University researchers identified and tested candidate video monitoring systems to determine which of the systems could be used to replace existing vehicle detection systems for both ramp signal operations and performance monitoring. They also developed a detector data visualization tool for performance monitoring.
  • TrafficEvent Unification System Highlighting Arterial Roads
    Traffic-Event Unification System Highlighting Arterial Roads
    Karnati, Yashaswi ;
    Mahajan, Dhruv
    2020-03-01 | PDF
    Detection of traffic interruptions (caused by vehicular breakdowns, road accidents, etc.) is a critical aspect of managing traffic on urban road networks. This work outlines a semi-supervised strategy to automatically detect traffic interruptions occurring on arteries in urban road networks using high resolution data from widely deployed fixed poin ...
  • Guidelines for Using StreetLight Data for Planning Tasks
    Guidelines for Using StreetLight Data for Planning Tasks
    Yang, Hong ;
    Cetin, Mecit
    2020-03-01 | PDF
    The Virginia Department of Transportation (VDOT) has purchased a subscription to the StreetLight (SL) Data products that mainly offer origin-destination (OD) related metrics through crowdsourcing data. Users can manipulate a data source like this to quickly estimate origin-destination trip tables. Nonetheless, the SL metrics heavily rely on the dat ...
  • Assessing the Impact of Federal Requirements on GDOT Project Portfolio Volume I
    Assessing the Impact of Federal Requirements on GDOT Project Portfolio, Volume I
    Tucker-Ray, Sarah ;
    Murphy, Elizabeth
    2020-03-01 | PDF
    This volume is the first in a series. The other volume in the series is FHWA-GA-20-1918 Volume II: Assessing the Impact of Federal Requirements on GDOT Project Portfolio – Volume II. The Georgia Department of Transportation (GDOT) is responsible for the state’s roads, bridges, interstate highways and other modes of transportation. In 2015, Georgia ...
  • Phase 2 High Visibility Crosswalk Pedestrian Study Concept to Countermeasure Research to Deployment Using the SHRP2 Safety Data
    Phase 2 – High Visibility Crosswalk Pedestrian Study: Concept to Countermeasure – Research to Deployment Using the SHRP2 Safety Data
    Majka, Kevin ;
    Pierowicz, John
    2020-03-01 | PDF
    This study was focused on evaluating the effectiveness that high-visibility crosswalk (HVC) markings have on improving pedestrian safety. Naturalistic driving data was used to analyze vehicle kinematics and driver behavior in relation to the approach and traversal of HVC locations before and after their implementation. Traffic safety surrogates wer ...
  • Risk Assessment of Roadside Utility Structures Under Vehicular Impacts
    Risk Assessment of Roadside Utility Structures Under Vehicular Impacts
    Fang, Howie ;
    Li, Zheng
    2020-02-29 | PDF
    Roadside structures such as bus shelters and cluster mailboxes are increasingly used in urban areas. These structures raise safety concerns due to the likelihood of being struck by errand vehicles. The main objective of this research was to evaluate a bus shelter and two types of cluster mailboxes under impacts of MASH compliant vehicles. Finite el ...
  • Utilizing Graceful Failure As An Opportunity for Flood Mitigation Downstream to Protect Communities and Infrastructure
    Utilizing Graceful Failure As An Opportunity for Flood Mitigation Downstream to Protect Communities and Infrastructure
    Camp, Janey ;
    Laning, Nick
    2020-02-28 | PDF
    In 2011, the authors observed how “graceful failure” through planned destruction of portions of the Birds Point Levee by the US Army Corps of Engineers (USACE) was enacted to alleviate extreme flooding on the Mississippi River. This action, while flooding thousands of acres of croplands as intended, reduced flooding and potential damage to waterway ...
  • Development of the Optimization Model for Improving Safety at Rail Crossings in Florida
    Development of the Optimization Model for Improving Safety at Rail Crossings in Florida
    Dulebenets, Maxim A. ;
    Moses, Ren
    2020-02-28 | PDF
    The State of Florida has been recognized for its freight mobility and increasing volumes of international trade. A significant portion of freight handled in the State of Florida is transported by rail. Along with the growing demand for rail-freight transportation, safety at highway-rail grade crossings has posed a significant challenge to the Flori ...
  • Developing a Strategic Roadmap for Caltrans Implementation of Virtual Design ConstructionCivil Integrated Management
    Developing a Strategic Roadmap for Caltrans Implementation of Virtual Design Construction/Civil Integrated Management
    Ravani, Bahram ;
    Donohoe, Sean
    2020-02-28 | PDF
    Virtual Design Construction (VDC) and Civil Integrated Management (CIM) are recent innovations that have been shown to improve project delivery and reduce cost through the entire lifecycle of a project. Integrating VDC/CIM within the organization’s delivery processes would lead to increased efficiencies for tax dollars, cost savings, reduce constru ...
  • Evaluation of Roadside Treatments to Mitigate Roadway Departure Crashes Project Summary
    Evaluation of Roadside Treatments to Mitigate Roadway Departure Crashes [Project Summary]
    Avelar, Raul ;
    Geedipally, Srinivas
    2020-02-28 | PDF
    The main purpose of this research project was to develop a systemic framework to identify high-risk locations for roadway departure crashes and applicable countermeasures for implementation (e.g., improving guardrails and barriers, or safety-treating roadside fixed objects). This research provided the Texas Department of Transportation (TxDOT) and ...
  • VCC User Survey Results Dataset
    Sanguinetti, Angela ;
    Alston-Stepnitz, Eli
    2020-02-25 | ZIP
    Strategies to promote plug-in electric vehicle (PEV) adoption include consumer education about potential energy cost savings. However, the complexity of comparing gasoline and electricity prices makes it difficult to quantify. Vehicle energy cost calculators (VCCs) help consumers navigate this complexity, and research shows they can increase consum ...
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