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  • Rural Expressway Intersection Synthesis of Practice and Crash Analysis
    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 Rural Expressway Intersection Synthesis of Practice and Crash Analysis Advisory speed beacon US 65 Bondurant Iowa Researcher s Principal investigator Tom Maze Co principal investigators Neal Hawkins 515 294 7733 hawkins iastate edu Student researcher Garrett Burchett Project status Completed Start date 10 01 03 End date 03 31 04 Publications Report Rural Expressway Intersection Synthesis of Practice and Crash Analysis 3 mb pdf October 2004 Related publications Rural Expressway Intersection Safety pdf Tech transfer summary Mar 2005 Improving safety at expressway intersections Technology News Dec 2004 Expressway crash data tell an interesting tale Technology News Oct 2004 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract This report presents a national synthesis of rural expressway two way stop controlled TWSC intersection safety strategies and intersection designs and an analysis of Iowa expressway TWSC intersection crash characteristics A rural expressway is a multi lane highway with a divided median

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-747764354 (2015-11-09)
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  • Smooth, Quiet, Safe Concrete Pavements: Scoping Study (Proj. 14)
    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 Smooth Quiet Safe Concrete Pavements Scoping Study Proj 14 Researcher s Principal investigators James K Cable Cable Concrete Consultation Co principal investigators Stephen Karamihas Dale Harrington Snyder Project status Completed Start date 10 01 03 End date 03 31

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=839971587 (2015-11-09)
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  • Development of a Method to Determine Pavement Damage Due to Detours (TR-470)
    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 Development of a Method to Determine Pavement Damage Due to Detours TR 470 Researcher s Principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Co principal investigator Ali Kamyab Project status Completed Start date 04 01 02 End date 03 03 04 Publications Report Development of a Method to Determine Pavement Damage Due to Detours TR 470 283 kb pdf April 2005 Sponsor s partner s Sponsor s Iowa Highway Research Board About the research Abstract The research presented in this report provides the basis for the development of a new procedure to be used by the Iowa DOT and cities and counties in the state to deal with detours Even though the project initially focused on investigating new tools to determine condition and compensation the focus was shifted to traffic and the gas tax method to set the basis for the new procedure It was concluded that the condition based approach even though accurate and consistent condition

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=483 (2015-11-09)
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  • Effectiveness of All-Red Clearance Time on Intersection Accidents and Violation Trends
    ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Effectiveness of All Red Clearance Time on Intersection Accidents and Violation Trends Similar related projects Evaluation of Automated Enforcement of Traffic Signal Violations in Iowa Researcher s Principal investigators Reginald Souleyrette Co principal investigators Zachary Hans 515 294 2329 zhans iastate edu Tom McDonald Student researcher Molly O Brien Project status Completed Start date 05 01 03 End date 02 28 04 Publications Report Effectiveness of All Red Clearance Time on Intersection Accidents and Violation Trends May 2004 Sponsor s partner s Sponsor s Minnesota Department of Transportation About the research Abstract Crashes at signalized intersections account for approximately 20 of all crashes both nationally and within the state of Minnesota Past research suggests that the use of all red clearance interval at signalized intersections may reduce intersection crashes particularly those related to signal violations Other research suggests that this reduction may only be temporary This research evaluated the safety effect of all red clearance intervals at low speed urban 4 way intersections in the City of Minneapolis The study included a review of literature and assessment of Midwestern state and local practice related to the use of

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=574 (2015-11-09)
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  • Field Evaluation of Compaction Monitoring Technology, Phase 1 (TR-495)
    Jaselskis 515 294 0250 ejaselsk iastate edu David White 515 294 1463 djwhite iastate edu Student researchers Lifeng Li Isaac Drew Project status Completed Start date 05 15 03 End date 02 28 04 Publications Report Final Report Field Evaluation of Compaction Monitoring Technology Phase 1 TR 495 7 mb pdf September 2004 Related publications TRB 2005 Paper Real time compaction monitoring in cohesive soils from machine response off site Oct 2011 Tech Transfer Summary Soil Compaction Monitoring Technology pdf Tech transfer summary Sep 2004 Sponsor s partner s Sponsor s Caterpillar Iowa Department of Transportation Iowa Highway Research Board About the research Abstract This Phase I report describes a preliminary evaluation of a new compaction monitoring system developed by Caterpillar Inc CAT for use as a quality control and quality assurance QC QA tool during earthwork construction operations The CAT compaction monitoring system consists of an instrumented roller with sensors to monitor machine power output in response to changes in soilmachine interaction and is fitted with a global positioning system GPS to monitor roller location in real time Three pilot tests were conducted using CAT s compaction monitoring technology Two of the sites were located in Peoria Illinois at the Caterpillar facilities The third project was an actual earthwork grading project in West Des Moines Iowa Typical construction operations for all tests included the following steps 1 aerate till existing soil 2 moisture condition soil with water truck if too dry 3 remix 4 blade to level surface and 5 compact soil using the CAT CP 533E roller instrumented with the compaction monitoring sensors and display screen Test strips varied in loose lift thickness water content and length The results of the study show that it is possible to evaluate soil compaction with relatively good accuracy using machine energy

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=190237771 (2015-11-09)
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  • Determination of the Optimum Base Characteristics for Pavements (TR-482)
    and aggregate from trimmer on right side Aggregate sampled from quarry left and from trimmer right Gomaco trimmer for fine trimming the aggregate layer Aggregate placed on the base layer from trimmer left and from quarry right Aggregate seggregation on the final compacted base layer Researcher s Principal investigators David White 515 294 1463 djwhite iastate edu Co principal investigators Charles Jahren 515 294 3829 cjahren iastate edu Student researcher Pavana Vennapusa Project status Completed Start date 08 15 02 End date 02 14 04 Publications Report Final Report Determination of the Optimum Base Characteristics for Pavements TR 482 11 9 mb pdf May 2004 Related publications Pavement Drainage Estimator V1 0 off site Nov 2012 TRB 2006 Paper In situ permeability of unbound granular bases using the air permeameter test off site Oct 2011 ASTM Paper A device for rapid determination of permeability for drainable bases off site Oct 2011 Tech Transfer Summary Optimum Pavement Base Characteristics pdf Tech transfer summary May 2004 Sponsor s partner s Sponsor s Iowa Highway Research Board About the research Abstract In recent years it has become apparent that the design and maintenance of pavement drainage extends the service life of pavements Most

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=546 (2015-11-09)
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  • Evaluating Speed Differences between Passenger Vehicles and Heavy Trucks for Transportation-related Emissions Modeling
    Vehicles and Heavy Trucks for Transportation related Emissions Modeling Hwy 55 in Golden Minnesota looking west Researcher s Principal investigators Shauna Hallmark 515 294 5249 shallmar iastate edu Iowa State University Student researcher Hillary Isebrands Project status Completed Start date 05 01 03 End date 01 31 04 Publications Report Evaluating Speed Differences between Passenger Vehicles and Heavy Trucks for Transportation related Emissions Modeling 1 2 mb pdf July 2004 Tech transfer summary Role of Passenger Vehicle and Heavy Truck Speed Differences in Emissions Modeling pdf Sep 2004 Sponsor s partner s Sponsor s Federal Highway Administration About the research Abstract Heavy vehicles emit emissions at different rates than passenger vehicles They may behave differently on the road as well yet they are often treated similarly to passenger vehicles in emissions modeling Although not frequently considered in calculating emission rates differences in the operating speeds of passenger vehicles and heavy trucks may influence emissions The main goal of this research project was to evaluate whether heavy trucks typically travel at significantly different operating speeds than passenger vehicles and what impact differences in on road speeds would have on emissions Average speeds and spot speeds were collected for heavy trucks and

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1047500855 (2015-11-09)
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  • Portland Cement Concrete Patching Techniques vs. Performance and Traffic Delay
    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 Portland Cement Concrete Patching Techniques vs Performance and Traffic Delay Researcher s Principal investigators James K Cable Cable Concrete Consultation Co principal investigators Kejin Wang 515 294 2152 kejinw iastate edu Iowa State University Project status Completed Start date 01 01 03 End date 01 15 04 Publications Report Portland Cement Concrete Patching Techniques vs Performance and Traffic Delay 1 8 mb pdf January 2004 Tech transfer summary PCC Patching Techniques Performance vs Traffic Delay Time pdf Oct 2005 Sponsor s partner s Sponsor s Dept of Civil Construction and Environmental Engineering ISU About the research Abstract Standards for the construction of full depth patching in portland cement concrete pavement usually require replacement of all deteriorated based materials with crushed stone up to the bottom of the existing pavement layer In an effort to reduce the time of patch construction and costs the Iowa Department of Transportation and the Department of Civil Construction and Environmental Engineering at Iowa State University

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1126878019 (2015-11-09)
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