ROAD METER CORRELATIONS: IOWA STATE HIGHWAY COMMISSION

AFTER A SERIES OF TESTS WITH ROUGHOMETERS AND THE CHLOE PROFILOMETER THE COMMISSION DECIDED TO EMPLOY THE LATTER IN ANNUAL CHECKS OF ITS ROAD METERS ON ONE-HALF MILE SECTIONS HAVING PSR'S RANGING FROM 2.7 TO 4.6. AT PRESENT THERE ARE 54 SUCH SECTIONS. THE CHLOE SLOPE VARIANCE AND THE ROAD METER SUMMATION OF COUNTS ARE DETERMINED FOR ALL CORRELATION SECTIONS, AND THE FIT IS PLOTTED BY A COMPUTER PROGRAM. IN ALL CASES THE CORRELATION COEFFICIENT HAS BEEN BETTER FOR A PARABOLIC FIT THAN FOR A LINEAR ONE. A CORRELATION IS MADE ANNUALLY IN MAY, AND THEN WEEKLY CHECKS ARE MADE ON SIX CORRELATION SECTIONS. THE VERIFIED CORRELATION EQUATION IS COMBINED WITH THE FLEXIBLE AND RIGID EQUATIONS FROM THE AASHO ROAD TEST, AND THE RESULT IS PLOTTED ON A SEMILOGARITHMIC GRAPH. AN INVENTORY OF IOWA'S 10,000 MILES OF PRIMARY HIGHWAY, INCLUDING A CRACKING AND PATCHING SURVEY, HAS BEEN CONDUCTED AND STORED ON MAGNETIC TAPE TO BE USED IN DETERMINING MAINTENANCE AND CONSTRUCTION PRIORITIES.

• Record URL:
  • https://onlinepubs.trb.org/Onlinepubs/sr/sr133/133-010.pdf
• Supplemental Notes:
  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Marks, Vernon J
• Conference:
  • Workshop on Pavement Evaluation Using Road Meters
  • Location: West Lafayette Indiana, United States
  • Date: 1972-4-18 to 1972-4-20
• Publication Date: 1973

Media Info

• Media Type: Digital/other
• Features: Figures;
• Pagination: pp 66-67
• Monograph Title: PAVEMENT EVALUATION USING ROAD METERS
• Serial:
  • Highway Research Board Special Report
  • Issue Number: 133
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Condition surveys; Equipment; Highway maintenance; Highways; Information processing; Inventory; Pavement management systems; Primary highways; Profilometers; Ratings; Road meters; Strategic planning
• Uncontrolled Terms: Sufficiency rating
• Geographic Terms: Iowa
• Subject Areas: Freight Transportation; Highways; Pavements;

Filing Info

• Accession Number: 00207534
• Record Type: Publication
• Files: TRIS, TRB, ATRI
• Created Date: May 21 1973 12:00AM