IMPROVING TRAFFIC-COUNT PROCEDURES BY APPLICATION OF STATISTICAL METHOD

AN IMPROVED METHOD HAS BEEN DEVELOPED FOR LARGE-SCALE TRAFFIC-COUNTING OPERATIONS WHICH MAKES USE OF THE CHARACTERISTIC THAT IF COVERAGE TRAFFIC COUNTS ARE MADE FOR 48 CONSECUTIVE HOURS ON WEEKDAYS THEIR MEAN 24-HOUR VALUES WILL VARY FROM THE MEAN 24-HOUR VALUES OF ALL WEEKDAYS IN THE MONTH BY 10 PERCENT OR LESS IN ABOUT THREE FOURTHS OF ALL COUNTS ON ROADS CARRYING APPROXIMATELY 300 VEHICLES PER DAY OR MORE. FOR THE CONVERSION OF THE 24-HOUR COUNTS TO THE ANNUAL AVERAGE DAILY TRAFFIC, THE STATISTICAL METHOD OF MATHEMATICAL PROBABILITY IS USED. IN COMPUTING CONVERSION FACTORS, ROAD SECTIONS ARE GROUPED ACCORDING TO THE SIMILARITY OF PATTERNS OF MONTHLY VARIATIONS OF TRAFFIC VOLUMES. THEN A MEAN PATTERN OF MONTHLY VARIATIONS IN CONVERSION FACTORS IS COMPUTED FOR EACH GROUP OF ROAD SECTIONS HAVING SIMILAR PATTERNS. THIS COMPUTATION IS MADE FROM SAMPLE COUNTS TAKEN BY SYSTEMATIC SAMPLING PROCEDURE. THIS SAMPLING CAN BE MADE FOR ANY DESIRED DEGREE OF ACCURACY OF ESTIMATES OF ANNUAL AVERAGE DAILY TRAFFIC, THE COST VARYING WITH THE DEGREE OF ACCURACY SOUGHT. /AUTHOR/

  • Supplemental Notes:
    • Vol 33, pp 362-375, 4 FIG, 2 TAB
  • Authors:
    • Petroff, B B
    • Blensly, R C
  • Publication Date: 1954

Media Info

  • Monograph Title: Proceedings of the Thirty-Third Annual Meeting of the Highway Research Board, Washington, D.C., January 12-15, 1954
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00228096
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 9 1972 12:00AM