FACTORS AFFECTING ROUGHOMETER MEASUREMENTS

DURING 1965 AND 1966 SPECIAL STUDIES WERE UNDERTAKEN TO ESTABLISH IMPROVED TECHNIQUES FOR THE APPLICATION OF THE ROAD ROUGHOMETER, TO REVIEW THE TWO ROUGHNESS MEASURING SYSTEMS EMPLOYED, TO ANALYZE UNUSUAL RESULTS AND SEARCH FOR AN EXPLANATION OF THEM, AND TO EVOLVE, IF POSSIBLE, A BETTER INTERPRETATION OF ROUGHOMETER MEASUREMENTS AS RELATED TO ROAD PASSENGER COMFORT. THE STUDY OF ROUGHNESS MEASUREMENTS WAS EXTENDED TO EARLIER TESTS TO MAKE ANY CONCLUSIONS AS GENERAL AS POSSIBLE. THE STUDY INDICATED THAT TWO COUNTING SYSTEMS ARE DESIRABLE PARTIALLY AS A CHECK SINCE ONE SYSTEM HAD FAULTED ON A NUMBER OF TEST DAYS BUT MORE SPECIFICALLY BECAUSE IT WAS LEARNED THAT ON SOME TYPES OF SURFACES, WITH ONE SENSOR ON EACH SIDE OF THE ROUGHOMETER, ONE MEASURING SYSTEM WOULD READ A SIGNIFICANTLY HIGHER ROUGHNESS THAN THE OTHER AND AN AVERAGE READING WOULD PROVIDE A FAR MORE RELIABLE VALUE. ALSO THERE WERE INDICATIONS THAT THE DIFFERENCE IN BUMP RESOLUTION OF THE TWO SYSTEMS CAUSED ONE TO MEASURE LESS ON ROUGHER BITUMINOUS CONCRETE ROADS. TOWING ARRANGEMENTS AS A RESULT OF THE TOWING SYSTEMS AND ROUGHOMETER DYNAMICS INFLUENCE THE ROUGHNESS MEASUREMENTS AND ON SOME SURFACES, TOWING SPEED TOLERANCE IS ONLY PLUS ONE OR TWO MILES PER ERROR TO AVOID ERRORS GREATER THAN FIVE PERCENT. ON SHORT TEST SECTIONS OF HIGHWAY; LESS THAN A MILE, IT WAS SHOWN THAT SINGLE TESTS ARE TOTALLY UNRELIABLE. FINALLY, THERE ARE HIGHWAYS WHICH THE ROUGHOMETER AND A CORRESPONDING PRESENT SERVICEABILITY INDEX WOULD ACCLAIM FOR THEIR SMOOTHNESS AND HIGH SERVICEABILITY, BUT WHICH ARE DEFINITELY UNSATISFACTORY FOR PASSENGER TRAFFIC. /AUTHOR/

  • Supplemental Notes:
    • Hpr-1/1/, STATE 607/63/, BPR 7
  • Corporate Authors:

    South Dakota Department of Transportation

    700 East Broadway Avenue
    Pierre, SD  United States  57501
  • Authors:
    • Crawford, R A
    • Dauberman, W H
  • Publication Date: 1966

Subject/Index Terms

Filing Info

  • Accession Number: 00206282
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Nov 1 1994 12:00AM