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  • Thin Maintenance Surfaces, Phase 2 with Guidelines for Winter Maintenance on Thin Maintenance Surfaces (TR-435)
    Surfaces TR 435 Close up View of Some Scraping of the Roadway Surface and Overall Poor Condition of the Roadway Researcher s Principal investigators Charles Jahren 515 294 3829 cjahren iastate edu Co principal investigator Ken Bergeson Project status Completed Start date 07 01 99 End date 01 31 03 Publications Report Thin Maintenance Surfaces Phase 2 with Guidelines for Winter Maintenance on Thin Maintenance Surfaces TR 435 3 3 mb pdf January 2003 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract In recent years there has been renewed interest in using preventive maintenance techniques to extend pavement life and to ensure low life cycle costs for our road infrastructure network Thin maintenance surfaces can be an important part of a preventive maintenance program for asphalt cement concrete roads The Iowa Highway Research Board have sponsored Phase Two of this research project to demonstrate the use of thin maintenance surfaces in Iowa and to develop guidelines for thin maintenance surface uses that are specific to Iowa This report documents the results of test section construction and monitoring started in Phase One and continued in Phase Two The report provides a recommended seal coat design

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-944598703 (2015-11-09)
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  • Angle Parking on Iowa's Low Volume Primary Extensions in Small Towns
    Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Angle Parking on Iowa s Low Volume Primary Extensions in Small Towns Researcher s Principal investigators Reginald Souleyrette Co principal investigator Tom McDonald Student researcher Ryan J Tenges Project status Completed Start date 07 01 02 End date 01 01 03 Publications Report Angle Parking on Iowa s Low Volume Primary Extensions in Small Towns 253 kb pdf January 2003 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract On street parking has been considered problematic by engineers for many years In fact numerous studies have concluded that diagonal or angle parking in particular is potentially more of a safety concern than parallel or no parking at all It is a common position of many states including Iowa to discourage or completely prohibit angle parking on primary road extensions in urban areas However with the acceptance of context sensitive design and traffic calming techniques policies for on street parking are receiving re consideration in many agencies including the FHWA This study was undertaken to analyze operational and safety histories in the state of Iowa where various types of on street parking have existed for many years concentrating in particular on smaller communities Specifically of interest was a comparison of diagonal parking locations to other types with regard to related crash histories If possible it was intended to develop guidelines to assist Iowa Department of Transportation designers in the consideration of parking requirements for road improvements through small communities In this regard several criteria were analyzed to determine possible contribution to crash history including road width clearance to parked vehicles traffic volumes community population and length of parking area None of these factors with the possible exception of population displayed a clearly

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1079536799 (2015-11-09)
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  • Effectiveness of Extra Enforcement in Construction and Maintenance Work Zones--Midwest States Smart Work Zone Deployment Initiative: Year 4
    End date 12 31 02 Publications Report Effectiveness of Extra Enforcement in Construction and Maintenance Work Zones Midwest States Smart Work Zone Deployment Initiative Year 4 665k pdf May 2003 Sponsor s partner s Sponsor s Mid America Transportation Center University of Nebraska at Lincoln About the research Abstract As traffic related work zone crashes continue to increase across the nation safety of road users and workers has become a top priority for transportation agencies Since inattention and irresponsible behavior by drivers are surmised to contribute to the frequency of work zone crashes a program featuring extraordinary presence of and enforcement by law officers has been implemented in many states to address this concern A literature search of such programs and related research was conducted While the overall benefits of these activities have been found positive much of the evidence has been anecdotal To assess the scope of extra work zone enforcement programs a survey was developed and distributed to state departments of transportation across the nation This survey sought information regarding these efforts such as criteria for selection of target work zones methods of enforcement operations and beneficial results A special survey was also designed and distributed to enforcement agencies in Iowa and other selected states In addition to the surveys personal contacts and office visits were conducted by the research team staff The study found that use of extra enforcement in work zones is a common practice in many states and these activities appear to be increasing Current literature survey responses and interviews have all indicated a prevalent opinion for the benefits of increased law enforcement presence and activity in work zones Very few comments offered conclusions of negative impacts such as additional congestion from these efforts However the beneficial effects of focused enforcement have not been intensively

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=511 (2015-11-09)
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  • Improving Efficiency of Transportation Projects Using Laser Scanning
    s partner s Sponsor s Iowa Department of Transportation Midwest Transportation Consortium About the research Abstract Laser scanning is a terrestrial laser imaging system that creates highly accurate three dimensional images of objects for use in standard computer aided design software packages This report describes results of a pilot study to investigate the use of laser scanning for transportation applications in Iowa After an initial training period on the use of the scanner and Cyclone software pilot tests were performed on the following projects intersection and railroad bridge for training purposes section of highway to determine elevation accuracy and pair of bridges to determine level of detail that can be captured new concrete pavement to determine smoothness bridge beams to determine camber for deck loading calculations stockpile to determine volume and borrow pit to determine volume Results show that it is possible to obtain 2 6 mm precision with the laser scanner as claimed by the manufacturer compared to approximately one inch precision with aerial photogrammetry using a helicopter A cost comparison between helicopter photogrammetry and laser scanning showed that laser scanning was approximately 30 percent higher in cost depending on assumptions Laser scanning can become more competitive to helicopter photogrammetry by elevating the scanner on a boom truck and capturing both sides of a divided roadway at the same time Two and three dimensional drawings were created in MicroStation for one of the scanned highway bridges It was demonstrated that it is possible to create such drawings within the accuracy of this technology It was discovered that a significant amount of time is necessary to convert point cloud images into drawings As this technology matures this task should become less time consuming It appears that laser scanning technology does indeed have a place in the Iowa Department of Transportation

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=526 (2015-11-09)
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  • Iowa DOT Internet-Based Road Work Report
    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 Iowa DOT Internet Based Road Work Report Researcher s Principal investigators Reginald Souleyrette Co principal investigators Zachary Hans 515 294 2329 zhans iastate

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=379 (2015-11-09)
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  • Pedestrian Crossing Safety Technology Assessment
    Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Pedestrian Crossing Safety Technology Assessment State law yield to pedestrian sign Similar related projects In Pavement Pedestrian Flasher Evaluation Cedar Rapids Iowa Researcher s Principal investigators Reginald Souleyrette Co principal investigator Ed Kannel 515 294 2861 ekannel iastate edu Project status Completed Start date 07 01 02 End date 12 31 02 Publications Report Pedestrian Crossing Safety Technology Assessment 146KB pdf June 2003 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract The Traffic Engineering Department of Cedar Rapids Iowa a city of approximately 125 000 people frequently received letters expressing concern for pedestrian safety at key non controlled intersections The city has 21 designated pedestrian crosswalks at non intersection non school and non trail crossings as well as numerous uncontrolled intersections In 2002 the Cedar Rapids City Council gave preliminary approval to implement a pedestrian actuated overhead flasher system and an in pavement flasher system However before proceeding with these projects the Cedar Rapids Traffic Engineering Department sought assistance from the Iowa Department of Transportation to evaluate a lower cost option an in street flexible sign to remind motorists of their obligation to yield to pedestrians This report summarizes the results from a small scale study to evaluate the effect of an experimental in street sign State Law Yield to Pedestrians in Crosswalk Three sites with widely different characteristics were selected by the city and the Center for Transportation Research and Education at Iowa State University provided a small scale assessment Although only two of the sites were open to normal traffic flow during the study period all sites are generally discussed in this report The State Law Yield to Pedestrian sign has had a positive impact on driver behavior

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=544 (2015-11-09)
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  • Road Equipment Procurement and Utilization Study
    State University All rights reserved Road Equipment Procurement and Utilization Study Researcher s Principal investigators Ed Jaselskis 515 294 0250 ejaselsk iastate edu Co principal investigator Stephen Andrle Project status Completed Start date 11 15 01 End date 12 31 02 Publications Report Road Equipment Procurement and Utilization Study 1 62MB pdf October 2002 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract This study has investigated the procurement and use of construction and maintenance equipment owned or leased by public entities in Iowa that receive road use tax moneys The findings are provided as a basis for the Iowa Department of Transportation s Iowa DOT recommendation to the Iowa General Assembly as required by House File 324 Section 12 An equipment list was the foundation of a fill in the box survey instrument that collected information regarding number of pieces purchased or leased procurement method and percentage of use for maintenance and construction Both paper and electronic versions of the survey were sent to a total of 378 entities that receive road use tax moneys all counties in Iowa all cities in Iowa with populations greater than 5 000 all cities in Iowa with populations between 2 000 5 000 a sample of cities in Iowa with populations less than 2 000 and state agencies including the Iowa Board of Regents institutions Iowa Department of Natural Resources Iowa DOT and all state correctional facilities Most of the equipment subject to the survey was purchased rather than leased 99 versus 1 Procurement policies vary depending on the responding entity A formal bidding procedure is typically used for larger agencies such as cities with populations greater than 5 000 and the Iowa DOT Smaller cities tend to purchase equipment used Results reveal most of the purchased

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=485 (2015-11-09)
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  • Work Zone Speed Advisory System--Midwest States Smart Work Zone Deployment Initiative: Year 4
    Iowa State University All rights reserved Work Zone Speed Advisory System Midwest States Smart Work Zone Deployment Initiative Year 4 Similar related projects Smart Work Zone Deployment Initiative Researcher s Principal investigator Ali Kamyab Project status Completed Start date 05 01 02 End date 12 31 02 Sponsor s partner s Sponsor s University of Nebraska at Lincoln About the research Abstract As traffic volumes increase above the roadway capacity

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=514 (2015-11-09)
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