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  • Best Practices and Recommended Strategies for Shared Left Turn Lanes at Signal Control Approaches
    8664 Phone 515 294 8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Best Practices and Recommended Strategies for Shared Left Turn Lanes at Signal Control Approaches Similar related projects Impact of Left Turn Phasing on Older and Younger Drivers at High Speed Signalized Intersections Researcher s Principal investigators Neal Hawkins 515 294 7733 hawkins iastate edu Co principal investigators

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1572978786 (2015-11-09)
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  • Crash Record Validation Study
    50010 8664 Phone 515 294 8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Crash Record Validation Study Researcher s Principal investigators Reginald Souleyrette Project status Completed Start date 05 01 06 End date 08 31 06 Publications Report Crash data validation An Iowa case study 390 kb pdf February 2007 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract With the quickening pace of crash reporting the statistical editing of data on a weekly basis and the ability to push working databases to CTRE Iowa Traffic Safety Data Service the University of Iowa and Iowa DOT users we have a situation where databases that would be considered incomplete by past standards of static data files are in public use even as the dynamic nature of the central DOT database allows changes to be made in both the aggregate of data and in the individual crashes already reported The definitive analyses of serious crashes will by their nature lag seriously behind preliminary files Even after these anlyses the dynamic nature of the mainfram data file means that crash numbers can continue to change long after

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1483864927 (2015-11-09)
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  • Evaluation of Composite Pavement Unbonded Overlays: Phase III (TR-478, HR-1093, Proj. 2)
    projects Evaluation of Composite Pavement Unbonded Overlays Phases I and II TR 478 Proj 2 Design and Construction Procedures for Concrete Overlay and Widening of Existing Pavements TR 511 Proj 6 Evaluation of Unbonded Ultrathin Whitetopping of Brick Streets TR 466 Researcher s Principal investigators James K Cable Cable Concrete Consultation Student researcher Toni Tabbert Project status Completed Start date 09 25 01 End date 08 31 06 Publications Report Evaluation of Composite Pavement Unbonded Overlays Phase III TR 478 HR 1093 Proj 2 2 mb pdf August 2006 Tech transfer summary Thin Unbonded Overlay Performance on Composite Pavement pdf Aug 2006 Sponsor s partner s Sponsor s Federal Highway Administration Iowa Highway Research Board About the research Abstract In recent years thin whitetopping has evolved as a viable rehabilitation technique for deteriorated asphalt cement concrete ACC pavements Numerous projects have been constructed and tested allowing researchers to identify the important elements contributing to the projects successes These elements include surface preparation overlay thickness synthetic fiber reinforcement usage joint spacing and joint sealing Although the main factors affecting thin whitetopping performance have been identified by previous research questions still existed as to the optimum design incorporating these variables The objective

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1674527379 (2015-11-09)
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  • Safety Impacts of Pavement Edge Dropoffs
    5249 shallmar iastate edu Iowa State University Co principal investigator Tom McDonald Student researcher David Veneziano Project status Completed Start date 07 01 04 End date 08 01 06 Publications Report Safety Impacts of Pavement Edge Dropoffs 2 8 mb pdf August 2006 Technology News Pavement edge drop off pdf Oct 2006 Sponsor s partner s Sponsor s AAA Foundation for Traffic Safety Midwest Research Institute About the research Abstract The research described in this report focuses on the magnitude and severity of run off road collisions evaluates federal and state guidance regarding when edge drop offs should be addressed and provides measures for the quantity and depth of edge drop offs on representative rural two lane roadways in the United States This information is necessary and required for states and counties to determine the economic benefits from addressing pavement edge drop offs to understand the importance of this aspect of the AASHTO Strategic Highway Safety Plan and to subsequently focus the limited maintenance resources necessary to mitigate this roadway problem One of the main goals of this research was to quantify the magnitude of edge drop off on rural two lane paved roadways As discussed in Chapter 4 21 counties in Iowa and 2 districts in Missouri were selected to provide a representative sampling of the magnitude and amount of edge drop off present in each state Pavement edge drop off height and the shape of the drop off as well as other road characteristics such as lane width shoulder type and shoulder width were documented along 150 segments in Iowa and 71 segments in Missouri on rural two lane paved roadways with unpaved shoulders Data were collected at a randomly selected 0 1 mile section for each mile of segment Segments were 2 miles or longer Although both

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=2073651291 (2015-11-09)
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  • Concrete Pavement Surface Characteristics (Proj. 15, Part 1)
    State University center administered by the Institute for Transportation Address 2711 S Loop Drive Suite 4700 Ames IA 50010 8664 Phone 515 294 8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Concrete Pavement Surface Characteristics Proj 15 Part 1 Diamond ground pavement Similar related projects Concrete Pavement Surface Characteristics Proj 15 Part 2 Researcher s Principal investigators Tom Cackler Co principal investigators Paul Wiegand 515 294 7082 pwiegand iastate edu Stephen Karamihas Dale Harrington Snyder Theodore Ferragut Robert Rasmussen Transtec Group Project status Completed Start date 07 01 04 End date 07 31 06 Publications Report Evaluation of U S and European Concrete Pavement Noise Reduction Methods 2 5 mb pdf July 2006 Related publications Concrete Solutions for Quieter Pavements on Existing Roadways pdf CP Tech Center Publication Oct 2006 Strategic Plan for Improved Concrete Pavement Surface Characteristics Executive Summary pdf CP Tech Center Publication Jul 2006 Strategic Plan for Improved Concrete Pavement Surface Characteristics pdf CP Tech Center Publication Jul 2006 Sponsor s partner s Sponsor s American Concrete Pavement Association Federal Highway Administration About the research Abstract The objective of this project is to develop a strategic

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1106856762 (2015-11-09)
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  • Evaluation of Hot Mix Asphalt Moisture Sensitivity Using the Nottingham Asphalt Test Equipment, Phase II (TR-555)
    Moisture Sensitivity Using the Nottingham Asphalt Test Equipment TR 483 Researcher s Principal investigators Chris Williams 515 294 4419 rwilliam iastate edu Iowa State University Project status Completed Start date 04 01 06 End date 07 31 06 Publications Report Evaluation of Hot Mix Asphalt Moisture Sensitivity Using the Nottingham Asphalt Test Equipment Phase II TR 555 3 91 mb pdf March 2010 Tech transfer summary Evaluation of HMA Moisture Sensitivity Using the Nottingham Asphalt Test Equipment 797 kb pdf Mar 2010 Sponsor s partner s Sponsor s Iowa Highway Research Board About the research Abstract Pavements are subjected to different stresses during their design lives A properly designed pavement will perform adequately during its design life and the distresses will not exceed the allowable limits however there are several factures that can lead to premature pavement failure One such factor is moisture sensitivity AASHTO T 283 is the standard test used in the moisture susceptibility evaluation of asphalt mixtures but the results of the test are not very representative of the expected behavior of asphalt mixtures The dynamic modulus test measures a fundamental property of the mixture The results of the dynamic modulus test can be used directly in

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1875958115 (2015-11-09)
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  • Southeast Michigan Local Road Concrete Road Durability Study
    515 294 8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Southeast Michigan Local Road Concrete Road Durability Study 6 year old pavement that was studied Researcher s Principal investigators Jim Grove Project status Completed Start date 11 15 05 End date 07 31 06 Publications Report Southeast Michigan Local Road Concrete Road Durability Study 1 8 mb pdf July

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1152623745 (2015-11-09)
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  • Western Growth Area Land Use Sensitivity Analysis, Phase 2
    keyword Project pages maintained by PI Search research CTRE is an Iowa State University center administered by the Institute for Transportation Address 2711 S Loop Drive Suite 4700 Ames IA 50010 8664 Phone 515 294 8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Western Growth Area Land Use Sensitivity Analysis Phase 2 Researcher s Principal investigators Neal Hawkins 515

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1374336259 (2015-11-09)
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