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  • Evaluation of Different Methods to Calculate Heavy-Truck VMT
    vehicles on a road affects traffic operations safety and pavement performance Researcher s Principal investigators Shauna Hallmark 515 294 5249 shallmar iastate edu Iowa State University Student researcher Stephen Lamptey Project status Completed Start date 08 01 02 End date 12 31 04 Publications Project webpage http www ctre iastate edu mtc projects 2002 01 htm Report Evaluation of Different Methods to Calculate Heavy Truck VMT 806 kb pdf December 2004 Tech transfer summary Calculating Heavy Truck VMT pdf Mar 2005 Sponsor s partner s Sponsor s Midwest Transportation Consortium About the research Abstract Reliable estimates of heavy truck volumes are important in a number of transportation applications Estimates of truck volumes are necessary for pavement design and pavement management Truck volumes are important in traffic safety The number of trucks on the road also influences roadway capacity and traffic operations Additionally heavy vehicles pollute at higher rates than passenger vehicles Consequently reliable estimates of heavy truck vehicle miles traveled VMT are important in creating accurate inventories of on road emissions This research evaluated three different methods to calculate heavy truck annual average daily traffic AADT which can subsequently be used to estimate vehicle miles traveled VMT Traffic data from continuous count stations provided by the Iowa DOT were used to estimate AADT for two different truck groups single unit and multi unit using the three methods The first method developed monthly and daily expansion factors for each truck group The second and third methods created general expansion factors for all vehicles Accuracy of the three methods was compared using n fold cross validation In n fold cross validation data are split into n partitions and data from the nth partition are used to validate the remaining data A comparison of the accuracy of the three methods was made using

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=482903126 (2015-11-09)
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  • Evaluation of the Effectiveness of Glued Laminated Helper Stringers
    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 Evaluation of the Effectiveness of Glued Laminated Helper Stringers Researcher s Principal investigators Terry Wipf 515 294 6979 tjwipf iastate edu Co principal investigators Doug Wood 515 294 3768 dwoody iastate edu Brent Phares 515 294 5879 bphares iastate edu Iowa State University Project status Completed Start date 01 01 02 End date 12 31 04 Sponsor s partner s Sponsor s USDA Forest Service About the research Abstract The objective of this project was to evaluate the effectiveness and usefulness of using glued laminated glulam timber stringers as helper stringers to add strength and stiffness to an existing timber railroad bridge The scope includes loading the bridge and measuring deflection of the bridge both before and after the addition of the glulam stringers to determine the percent increase in stiffness caused by the helper stringers as well as their effect on load sharing between individual stringers The test bridge is located on a Pudget Sound and Pacific Railroad

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=54226827 (2015-11-09)
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  • Identification of the Best Practices for the Design, Construction, and Repair of Bridge Approach Sections
    s Principal investigators Sri Sritharan 515 294 5238 sri iastate edu Iowa State University David White 515 294 1463 djwhite iastate edu Student researchers Mohamed Mekkawy Sudharshan Chetlur Project status Completed Start date 08 15 02 End date 12 31 04 Publications Report Final Report Identification of the Best Practices for the Design Construction and Repair of Bridge Approach Sections TR 481 9 7 mb pdf January 2005 Related publications ASCE Paper Underlying causes for settlement of bridge approach pavement systems off site Oct 2011 MCT 2005 Paper Simple design alternatives to improve drainage and reduce erosion at bridge abutments off site Oct 2011 Geosynthetics International Paper Performance of collapsible bridge approach backfill with geosynthetic drainage and reinforcement off site Oct 2011 Technology News Identifying bridge approach problems causes and possible solutions Technology News Sep 2005 Tech Transfer Summary Best Practices for Bridge Approaches pdf Tech transfer summary Jan 2005 Sponsor s partner s Sponsor s Iowa Highway Research Board About the research Abstract Bridge approach settlement and the formation of the bump is a common problem in Iowa that draws upon considerable resources for maintenance and creates a negative perception in the minds of transportation users This research study

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=545 (2015-11-09)
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  • Impacts of Overweight Implements of Husbandry on Minnesota Roads and Bridges
    Researcher s Principal investigators Brent Phares 515 294 5879 bphares iastate edu Iowa State University Co principal investigators Halil Ceylan 515 294 8051 hceylan iastate edu Iowa State University Terry Wipf 515 294 6979 tjwipf iastate edu Project status Completed Start date 09 01 04 End date 12 31 04 Publications Report Impacts of Overweight Implements of Husbandry on Minnesota Roads and Bridges 308 kb pdf December 2004 Sponsor s partner s Sponsor s Minnesota Department of Transportation About the research Abstract Over the past few decades the national industry has seen the number of farms decrease with a simultaneous increase in the average farm size With larger farms and continuously improving farming techniques the need to increase production and efficiency has affected equipment carrying capacity and completely changed the tools being used During select seasons it is common to have single axle loads on secondary roads and bridges that exceed normal load limits typical examples are grain carts and manure wagons Even though these load levels occur only during a short period of time of the year fall for grain carts and spring for manure wagons there is concern that they can do significant damage to pavements and bridges

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1090244041 (2015-11-09)
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  • In-Pavement Pedestrian Flasher Evaluation, Cedar Rapids, Iowa
    investigator Ed Kannel 515 294 2861 ekannel iastate edu Project status Completed Start date 06 01 03 End date 12 31 04 Publications Report In Pavement Pedestrian Flasher Evaluation Cedar Rapids Iowa 428 kb pdf April 2004 Sponsor s partner s Sponsor s Iowa Department of Public Safety About the research Abstract Numerous strategies have been experimented with nationwide in an attempt to reduce the overall number of pedestrian vehicle crashes especially in instances where improper crossing or failure to yield was the proximate cause of the crash Some of these measures include overhead signs flashing warning beacons advanced crossing signs more visible pavement markings in street Yield to Pedestrian signs and more recently in pavement flashing lights Pedestrian safety has been a key issue for the City of Cedar Rapids Iowa in particular at non controlled intersections and mid block crossings In 2002 the city council gave preliminary approval to implement a pedestrian actuated overhead flasher system in conjunction with an in pavement flasher system at the intersection of 1st Avenue NE and 4th Street NE in the downtown central business district This location is uncontrolled and has several elements that can create conflicts between pedestrians vehicles and trains

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1117667384 (2015-11-09)
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  • Incident Location Tool Support for South Dakota DOT
    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 Incident Location Tool Support for South Dakota DOT Researcher s Co principal investigators Dan Gieseman Project status Completed Start date 08 01 03

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1766592374 (2015-11-09)
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  • Iowa Transit ITS Needs Analysis
    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 Iowa Transit ITS Needs Analysis Researcher s Principal investigator Stephen Andrle Co principal investigator Dennis Kroeger Project status Completed Start date 06 01 01 End date 12 31

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=449 (2015-11-09)
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  • Pavement Management through Data Collection and Analysis
    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 Pavement Management through Data Collection and Analysis Researcher s Principal investigators Omar Smadi 515 294 7110

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1084806528 (2015-11-09)
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