PERPETUAL HIGHWAY NEEDS STUDY

THE COMPILATION OF A HIGHWAY NEEDS PROGRAM IS COMPLICATED BY MANY FACTORS, ONE OF THE PRINCIPAL ONES BEING CHANGING CONDITIONS. ALL ROADS IN OREGON ARE REVIEWED AT LEAST ONCE A YEAR APPLYING THE YARDSTICK OF ADEQUACY. COST ESTIMATES FALL INTO THREE CATEGORIES GIVEN IN DESCENDING ORDER OF THEIR ACCURACY: (1) JOBS ON WHICH DETAILED SURVEYS HAVE BEEN COMPLETED GIVING CLOSE ESTIMATES OF COST IF THE JOB IS NOT POSTPONED TOO LONG, (2) JOBS ON WHICH RECONNAISSANCE OR OTHER FIELD-TYPE REPORTS HAVE BEEN DEVELOPED TO A POINT WHERE A REASONABLE DEGREE OF ACCURACY OF ESTIMATES IS POSSIBLE, AND (3) ESTIMATES ON OTHER SECTIONS WHERE NO FIELD DATA HAS BEEN OBTAINED AND WHERE ESTIMATES ARE MADE BY THE COMPARATIVE OR LENGTH-UNIT COST BASIS. THE COMPARATIVE COST TYPE OF ESTIMATE REFLECTS ACCURACY OF COST ONLY TO A DEGREE COMMENSURATE WITH THE SKILL AND EXPERIENCE OF THE ESTIMATOR. THE ASSEMBLING AND CATALOGING OF DATA ARE DESCRIBED. A CATALOG IS MADE OF THE COMPLETE FUTURE NEEDS PROGRAM AND THIS INFORMATION IS PLACED ON STRAIGHT LINE CHARTS WHICH ARE BOUND IN ATLASES. ONCE THE COMPLETE CATALOG OF HIGHWAY NEEDS IS COMPILED IT IS POSSIBLE TO WORK OUT ANY TYPE OF FUTURE PROGRAM BY ASSEMBLING APPROPRIATE COST DATA FROM THE PROJECT LISTS.

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Filing Info

  • Accession Number: 00200324
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 7 1994 12:00AM