archive-edu.com » EDU » I » IASTATE.EDU

Total: 246

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • Durable, Cost Effective Pavement Marking Materials, Phase I (TR-454)
    edu Copyright 1996 2009 Iowa State University All rights reserved Durable Cost Effective Pavement Marking Materials Phase I TR 454 Researcher s Principal investigator Gary Thomas Project status Completed Start date 01 01 01 End date 06 30 01 Publications Report Durable Cost Effective Pavement Marking Materials Phase I TR 454 268KB pdf June 2001 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract Numerous types of pavement marking materials are used in the field today including paint epoxy tape and thermoplastic Each material has its own set of unique characteristics related to durability retroreflectivity installation cost and life cycle cost The Iowa Highway Research Board was interested in investigating the possibility of developing an ongoing program to evaluate the various products used in pavement marking The Center for Transportation Research and Education at Iowa State University has completed Phase I of this research to identify the current practice and experiences from around the United States to recommend a further course of action for the state of Iowa Research from many states had some common findings white markings are more retroreflective than yellow markings paint is by and large the least

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=384 (2015-11-10)
    Open archived version from archive

  • Geographic Information System-Based Accident Location and Analysis System (GIS-ALAS)
    April 1999 Related publication Emergency Response Information System ERIS User s guide pdf Jan 2002 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract For years traffic engineers and planners have performed safety analyses in support of the four E s Education of the community Empowerment of the members of the community Engineering when physical modifications are needed and Enforcement when necessary These analyses have been done without the advantages of graphical display of information which can often bring out patterns not easily identifiable in nonspatial data structures Today with the advent of low cost and powerful desktop computing and geographic information system software it is possible to integrate highway safety data and spatial graphics This project created GIS ALAS Accident Location and Analysis System The system provides spatial display query and analysis capabilities for users in highway safety law enforcement and health services In phase 1 this project converted the Iowa DOT s crash location and analysis system which analyzes some 700 000 crash records for the state s 100 000 mile roadway system and allowed seamless migration of DOT legacy crash record systems into a state of the art GIS platform providing engineers and analysts with a powerful yet familiar spatial relational processing system GIS ALAS reproduces most of the query and reporting functions of PC ALAS in a graphical environment which facilitates advanced spatial query and display capabilities Customized data requests are available and GIS ALAS provides graphical data access enabling the user to view and select desired locations on the network eliminating the need for node tables and paper maps Query results can be displayed in both map and tabular form thereby creating more easily interpreted query results and promoting the analysis of accident patterns and causal relationships The project documented

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=116 (2015-11-10)
    Open archived version from archive

  • GPS to LRM: Integration of Spatial Point Features with Linear Referencing Methods
    Features with Linear Referencing Methods Similar related projects Iowa DOT Linear Referencing System Preliminary Linear Data Creation Researcher s Principal investigators Shauna Hallmark 515 294 5249 shallmar iastate edu Iowa State University Project status Completed Start date 06 01 00 End date 06 30 01 Publications Report GPS to LRM Integration of Spatial Point Features with Linear Referencing Methods 1 13MB pdf October 2001 CTRE en Route Integrating spatial and linear referencing data for DOTs pdf Aug 2001 Sponsor s partner s Sponsor s Iowa Department of Transportation Midwest Transportation Consortium About the research Abstract Global positioning systems GPS offer a cost effective and efficient method to input and update transportation data The spatial location of objects provided by GPS is easily integrated into geographic information systems GIS The storage manipulation and analysis of spatial data are also relatively simple in a GIS However many data storage and reporting methods at transportation agencies rely on linear referencing methods LRMs consequently GPS data must be able to link with linear referencing Unfortunately the two systems are fundamentally incompatible in the way data are collected integrated and manipulated In order for the spatial data collected using GPS to be integrated into a linear referencing system or shared among LRMs a number of issues need to be addressed This report documents and evaluates several of those issues and offers recommendations In order to evaluate the issues associated with integrating GPS data with a LRM a pilot study was created To perform the pilot study point features a linear datum and a spatial representation of a LRM were created for six test roadway segments that were located within the boundaries of the pilot study conducted by the Iowa Department of Transportation linear referencing system project team Various issues in integrating point features with a

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=372 (2015-11-10)
    Open archived version from archive

  • Guidelines for the Conversion of 4-lane Undivided Roadways to 3-lane 2-way Left-turn Lane Facilities
    date 06 30 01 Publications Project webpage http www ctre iastate edu research 4laneto3lane htm Report Guidelines for the Conversion of 4 lane Undivided Roadways to 3 lane 2 way Left turn Lane Facilities 626KB pdf April 2001 Related publications Urban Four Lane Undivided to Three Lane Roadway Conversion Guidelines pdf 2003 Mid Continent Transportation Research Symposium Aug 2003 When are three lanes better than four pdf CTRE en Route Aug 2001 Converting Four Lane Undivided Roadways to a Three Lane Cross Section Factors to Consider pdf Conference paper presentation Aug 1999 Abstract of Converting Four Lane Undivided Roadways to a Three Lane Cross Section Factors to Consider pdf Conference paper presentation Aug 1999 The Conversion of Four Lane Undivided Urban Roadways to Three Lane Facilities pdf Conference paper presentation Jun 1999 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract Four lane undivided roadways in urban areas can experience a degradation of service and or safety as traffic volumes increase It has been found that the conversion of a four lane undivided cross section to three lanes i e one lane in each direction and a two way left turn lane can improve safety and maintain an acceptable level of service These guidelines summarize the results of past research in this area and qualitative quantitative before and after safety and operational impacts of case study conversions located throughout the United States and Iowa The simulation results along with past research and case study results appear to support following volume related feasibility suggestions for four lane undivided to three lane cross section conversions It is recommended that a four lane undivided to three lane conversion be considered as a feasible with respect to volume only option when bi directional peak hour volumes are less than

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=339 (2015-11-10)
    Open archived version from archive

  • Origin Destination Model Estimation for I-235 Traffic Simulation Study
    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 Origin Destination Model Estimation for I 235 Traffic Simulation Study Researcher s Principal investigator Stephen Andrle Co principal investigators Reginald Souleyrette Project status

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=410 (2015-11-10)
    Open archived version from archive

  • Paved Shoulders on Primary Highways in Iowa: An Analysis of Shoulder Surfacing Criteria, Costs, and Benefits
    iastate edu Copyright 1996 2009 Iowa State University All rights reserved Paved Shoulders on Primary Highways in Iowa An Analysis of Shoulder Surfacing Criteria Costs and Benefits Similar related projects Systematic Identification of High Crash Locations Researcher s Principal investigators Reginald Souleyrette Co principal investigators Zachary Hans 515 294 2329 zhans iastate edu Tom McDonald Ali Kamyab Project status Completed Start date 07 01 00 End date 06 30 01 Publications Reports Paved Shoulders on Primary Highways in Iowa An Analysis of Shoulder Surfacing Criteria Costs and Benefits Executive summary 56 kb pdf November 2001 Paved Shoulders on Primary Highways in Iowa An Analysis of Shoulder Surfacing Criteria Costs and Benefits Final report 326 kb pdf November 2001 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract The value of providing paved shoulders adjacent to many higher volume roadways has been accepted in many states across the country Iowa s paved shoulder policy is considerably more conservative than neighboring states particularly on rural four lane and high volume two lane highways The objectives of this research were to examine current design criteria for shoulders employed in Iowa and surrounding states compare benefits and costs of

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=478 (2015-11-10)
    Open archived version from archive

  • Remote Sensing to Support Linear Referencing Systems
    mb pdf September 2001 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract This report evaluates the use of remotely sensed images in implementing the Iowa DOT LRS that is currently in the stages of system architecture The Iowa Department of Transportation is investing a significant amount of time and resources into creation of a linear referencing system LRS A significant portion of the effort in implementing the system will be creation of a datum which includes geographically locating anchor points and then measuring anchor section distances between those anchor points Currently system architecture and evaluation of different data collection methods to establish the LRS datum is being performed for the DOT by an outside consulting team This research extends that work by further evaluating the use of remotely sensed images for different components of the LRS Specifically the use of imagery for creation of the datum including locating anchor points and measuring anchor sections producing a spatial representation of the datum and locating intermediate intersections along the datum were investigated Three imagery datasets were evaluated in the various studies They included a 6 inch resolution dataset a 24 inch resolution dataset and a 1 meter resolution dataset The 1 meter dataset simulated the best satellite data available commercially A 2 inch resolution dataset was evaluated for several of the studies However coverage in the images was limited so it could not be fully evaluated Additionally Roadware consultants agreed and measured five test segments located in Pilot Study Area 2 using a DMI and DGPS as part of pavement condition assessment they were conducting The first section of this report provides background information on remote sensing Section 3 describes the datasets and pilot study areas that were included to complete the research The fourth section

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-174574113 (2015-11-10)
    Open archived version from archive

  • Systematic Identification of High Crash Locations
    iastate edu Ali Kamyab Project status Completed Start date 01 15 00 End date 06 30 01 Publications Project webpage http www ctre iastate edu research hcl index html Report Systematic Identification of High Crash Locations 2 46MB pdf May 2001 CTRE en Route Tools developed to identify potential high crash locations pdf Aug 2001 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract The objective of this project was to develop tools and procedures to identify potentially hazardous roadway locations and designs and to demonstrate the utility of these tools by developing candidate lists of high crash locations in Iowa An initial task built an integrated database to facilitate the tools and procedures The Iowa Department of Transportation Iowa DOT Geographic Information Management System GIMS and Geographic Information System Accident Analysis and Location System GIS ALAS databases were integrated with available digital imagery High crash locations and relationships between crash rates and selected roadway design characteristics were identified Based on input from county state and consulting engineers the project studied five crash types 1 crashes on horizontal curves 2 fixed object crashes 3 rural four lane expressway intersection crashes 4 head on crashes due to crossing the centerline and 5 urban four lane undivided corridor crashes Procedures were developed to integrate crash records and roadway characteristics e g traffic volumes number of lanes to estimate the crash rate on any segment of the Iowa roadway network and rank high crash locations using the Iowa DOT s conventional procedure average ranking by frequency rate and loss Statistical relationships between crash rates and roadway characteristics were then established The resulting statistical models identify significant roadway geometric factors in causation of certain crashes GIS based procedures were developed to facilitate the identification and

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=315 (2015-11-10)
    Open archived version from archive