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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 6321 - 6340 of 36049 results
  • Safety and Operations Guidance for Using TimeofDay ProtectedPermissive LeftTurn Phasing Using Flashing Yellow Arrows
    Safety and Operations Guidance for Using Time-of-Day Protected-Permissive Left-Turn Phasing Using Flashing Yellow Arrows
    King, F Adam ;
    Appiah, Justice
    2018-11-01 | PDF
    Selection of the left-turn phasing mode is a significant decision for the safe and efficient movement of left-turning traffic at signalized intersections. Because of different safety and operational effects associated with the signal left-turn mode, the two must be evaluated concurrently and be balanced based on capacity and crash potential when pr ...
  • Evaluation of Shelf Life in PostTensioning Grouts Summary
    Evaluation of Shelf Life in Post-Tensioning Grouts [Summary]
    Hamilton, Trey
    2018-11-01 | PDF
    University of Florida researchers studied the effect of heat, humidity, and time of exposure on the setting behavior of prepackaged grout products. Testing was also conducted on some of the constituents of post-tensioning grouts.
  • Corrosion Propagation of Carbon Steel Rebars in High Performance Concrete
    Corrosion Propagation of Carbon Steel Rebars in High Performance Concrete
    Presuel-Moreno, Francisco J ;
    Bencosme, Rolando
    2018-11-01 | PDF
    A better understanding of the corrosion propagation of carbon steel rebar embedded in high performance concrete is needed. The project aim was to fill some of the knowledge gaps. The study used samples exposed outdoors (now) for over 24 years to wet/dry cycles with seawater. The concrete of these samples can be considered high performance concrete ...
  • Comparative Analysis of Tack Coats Spray Paver Membranes and Underseals Technical Report
    Comparative Analysis of Tack Coats, Spray Paver Membranes, and Underseals: Technical Report
    Wilson, Bryan ;
    Banihashemrad, Seyedamin
    2018-11-01 | PDF
    Tack coats, trackless tack coats, spray paver underseal membranes, and underseals provide varying levels of bonding and sealing performance, but these benefits have not been sufficiently quantified, and neither has the overall impact on the asphalt overlay service life. This study 1) evaluated the performance of bonding and sealing treatments for b ...
  • Traffic Incident Management and Reducing Secondary Crashes in Arizona
    Traffic Incident Management and Reducing Secondary Crashes in Arizona
    Rensel, Eric ;
    Rafferty, Peter
    2018-11-01 | PDF
    Arizona’s current traffic crash data collection system including data for secondary crashes positioned the state to make significant advancement toward understanding the nature and impacts of those crashes. This study concentrated on identification of the benefits of effective Traffic Incident Management (TIM) practices on secondary crashes in term ...
  • Fracture Critical Steel Twin Tub Girder Bridges Technical Report
    Fracture Critical Steel Twin Tub Girder Bridges: Technical Report
    Hurlebaus, Stefan ;
    Mander, John B.
    2018-11-01 | PDF
    Steel twin tub girder bridges are an aesthetically pleasing structural option offering long-span solutions in tight radii-direct connectors. However, these bridges require a routine two-year inspection frequency, as well as a thorough hands-on inspection, because of their fracture critical designation. The heightened inspection requirements for fra ...
  • Analysis Guidelines and Examples for Fracture Critical Steel Twin Tub Girder Bridges
    Analysis Guidelines and Examples for Fracture Critical Steel Twin Tub Girder Bridges
    Hurlebaus, Stefan ;
    Mander, John B.
    2018-11-01 | PDF
    Twin steel tub girder bridges are an aesthetically pleasing structural option offering long span solutions in tight-radii direct connectors. However, these bridges require a routine two-year inspection frequency, as well as a thorough hands-on inspection because of their fracture critical designation. The heightened inspection requirements for frac ...
  • Stochastic Analysis of Logistics Capacity in Disaster Response Networks
    Stochastic Analysis of Logistics Capacity in Disaster Response Networks
    Goentzel, Jarrod ;
    Ropkopf, Alexander
    2018-11-01 | PDF
    Quickly deploying relief items is key to reducing a population’s burden in case of sudden onset disasters. Emergency response organizations, such as FEMA or local and state agencies hold a strategic stockpile of critical relief items and contract for contingency stock in preparation for emergencies. Their response capacity depends on their decision ...
  • Impact of LRFD Seismic Bridge Design for Georgia
    Impact of LRFD Seismic Bridge Design for Georgia
    DesRoches, R. ;
    Tien, Iris
    2018-11-01 | PDF
    The objectives of this study were to evaluate the impact of AASHTO LRFD seismic detailing on Georgia bridges under various seismic hazards. Significant findings from this study are the following: 1. The analytical results show significant influences of lap-splice length, rebar size, and transverse reinforcement (TR) spacing on the ductility behavio ...
  • Field Investigation of Stabilized FullDepth Reclamation SFDR
    Field Investigation of Stabilized Full-Depth Reclamation (SFDR)
    Ghasemi, Parnian ;
    Yu, Jianhua
    2018-11-01 | PDF
    The objectives of this study were to document the performance of roads using full-depth reclamation (FDR) and stabilized FDR (SFDR) in Minnesota, help develop SFDR design parameters appropriate for Minnesota, provide information on FDR/SFDR design procedures and specifications from beyond Minnesota, share current Minnesota FDR practices, and catalo ...
  • Development of Implementation Plan for GDOT eConstruction Program
    Development of Implementation Plan for GDOT e-Construction Program
    Durham, Stephan A. ;
    Ashuri, Baabak
    2018-11-01 | PDF
    Transportation agencies are constantly seeking new methods for engineering, construction, and administration in order to improve project efficiency and quality. The Georgia Department of Transportation (GDOT) seeks to improve its administrative processes with new e-Construction initiatives, including electronic submission and distribution of all co ...
  • Evaluation of Asphalt Base Course Construction and Acceptance Requirements Phase 1
    Evaluation of Asphalt Base Course Construction and Acceptance Requirements, Phase 1
    Green, Roger ;
    Robbins, Mary
    2018-11-01 | PDF
    Asphalt base is widely used in Ohio. During calendar year 2015, approximately 138,000 yd3 (105,500 m3) of Item 301 Asphalt Base and approximately 531,000 yd3 (406,000 m3) of Item 302 Asphalt Base were placed for ODOT by contract [ODOT, 2015]. Acceptance of asphalt base material, Ohio Department of Transportation (ODOT) Construction and Material Spe ...
  • EcoTrafiXTM Platform Deployment for Niagara International Transportation Technology Coalition NITTEC
    EcoTrafiXTM Platform Deployment for Niagara International Transportation Technology Coalition (NITTEC)
    Zingalli, Joe ;
    Yohanan, David
    2018-11-01 | PDF
    This document is the Final Report that describes the process and results of integrating various regional transportation data into the EcoTrafiX ATMS platform deployment in the Buffalo/Niagara region to facilitate the coordination of operational activities and events in the region and serve as a potential future platform for Integrated Corridor Mana ...
  • Historic Railroads of Georgia A Historic Context Study and Evaluation of Georgias Historic Railroads
    Historic Railroads of Georgia: A Historic Context Study and Evaluation of Georgia’s Historic Railroads
    McDaniel, Matt ;
    Storey, Steve
    2018-11-01 | PDF
    This context outlines the state’s rail history and places its basic physical infrastructure within the context of National Register of Historic Places eligibility, critical for GDOT’s compliance with Section 106 of the National Historic Preservation Act of 1966 (36 CFR 800). As such, this document includes a narrative history of rail development in ...
  • Multicriteria Decision Making MCDM for Evaluation of Different Transportation Alternatives A Case of Rawalpindi Bypass Pakistan
    Multicriteria Decision Making (MCDM) for Evaluation of Different Transportation Alternatives: A Case of Rawalpindi Bypass Pakistan
    Shakir, Malik Kamran ;
    Khurshid, Muhammad Bilal
    2018-11-01 | PDF
    Safe, efficient and user-friendly transportation of people and goods have been a premier point of concern for all the developed and the developing countries around the globe. National Highway N-5 or GT road is the most important highway link in Pakistan. It carries about 80 % of the country freight traffic. When this heavy traffic passes through th ...
  • High Reclaimed Asphalt Pavement RAP Asphalt Mixes for Low Volume Roads
    High Reclaimed Asphalt Pavement (RAP) Asphalt Mixes for Low Volume Roads
    Arambula-Mercado, Edith ;
    Chavarro-Munoz, Santiago J.
    2018-11-01 | PDF
    The Florida Department of Transportation yearly maintenance and rehabilitation activities include milling and resurfacing of approximately 2,000 lane miles of roadway, with an average resurfacing depth of about 2.1 inches (55 mm). These activities result in the generation and accumulation of roughly 1.8 million tons of reclaimed asphalt pavement (R ...
  • Incorporate Travel Mode Choices in the Regional Strategic Planning Model RSPM Tool
    Incorporate Travel Mode Choices in the Regional Strategic Planning Model (RSPM) Tool
    Wang, Liming
    ORCID ICON IMG
    2018-11-01 | PDF
    The GreenSTEP family of tools including the Regional Strategic Planning Model (RSPM), has been used in performance-based planning at the state and region level in Oregon and elsewhere. While the current implementation has a sufficient model of household vehicle miles traveled (VMT), it lacks in the representation of non-auto modes, and especially h ...
  • Evaluation of Counting Device for Pedestrians and Bicyclists Research Project Capsule 191SA
    Evaluation of Counting Device for Pedestrians and Bicyclists: Research Project Capsule [19–1SA]
    Ismail, Yasser A ;
    Rupnow, Tyson
    2018-11-01 | PDF
    The primary objective of this study is to evaluate Numina’s ability to accurately detect, track, and count pedestrians and cyclists under varying conditions (weather, time of day, density, etc.). The researchers anticipate that the results will lay the foundation for the development of a more robust automated system that will replace manual countin ...
  • Pavement SafetyBased Guidelines for Horizontal Curve Safety
    Pavement Safety-Based Guidelines for Horizontal Curve Safety
    Pratt, Michael P. ;
    Geedipally, Srinivas R.
    2018-11-01 | PDF
    The Texas Department of Transportation is increasing its efforts to improve rural highway curve safety by including high-friction surface treatments in the Highway Safety Improvement Program (HSIP). A handful of efforts are underway in the state to install these treatments or others that are intended to improve safety by increasing pavement skid re ...
  • Development of Calcined Clays as Pozzolanic Additions in Portland Cement Concrete Mixtures Summary
    Development of Calcined Clays as Pozzolanic Additions in Portland Cement Concrete Mixtures [Summary]
    Zayed, Abla
    2018-11-01 | PDF
    Concrete is certainly one of the most widely used construction materials. Extensive studies aimed at improving concrete’s strength and durability have identified a number of supplementary cementitious materials (SCMs) that can improve the performance of concrete. In Florida, the most common SCM is Class F fly ash, produced by the burning of certain ...
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