SAMPLE SIZE DETERMINATION FOR SPOT-SPEED STUDIES AT RURAL, INTERMEDIATE, AND URBAN LOCATIONS

IN THE ESTIMATION OF TRAFFIC CHARACTERISTICS BY A SAMPLING TECHNIQUE, THE DESIGN OF EXPERIMENT REQUIRES THE DETERMINATION OF AN ADEQUATE AND ECONOMICAL SAMPLE SIZE. THE EVALUATION OF SPEED CHARACTERISTICS IS ACCOMPLISHED BY A SAMPLING SURVEY AND A STATISTICAL ANALYSIS. A STATISTICAL PROCEDURE PREVIOUSLY DEVELOPED FOR SAMPLE SIZE DETERMINATION MADE POSSIBLE THE DESIGN OF A SPOT-SPEED STUDY WITH A SAMPLE SIZE THAT IS STATISTICALLY ACCEPTABLE. THE MEASURE OF SPEED VARIABILITY CAN BE OBTAINED FROM THE RESULTS OF PREVIOUS SPEED SURVEYS. HOWEVER, A RELIABLE ESTIMATE OF STANDARD DEVIATIONS PERMITS THE USE OF THE EQUATION FOR DETERMINING SAMPLE SIZE. THE FINDINGS OF THE PREVIOUS INVESTIGATION WERE SUPPLEMENTED BY ANALYZING THESE STANDARD DEVIATIONS OF SPOT-SPEEDS FOR 2-AND 4-LANE HIGHWAYS IN RURAL, INTERMEDIATE AND URBAN AREAS. REFERENCES' APPLIED GENERAL STATISTICS, 2ND EDITION, F. E. CROXTON AND D.J. COWDEN, PRENTICE-HALL 1955. SAMPLE SIZE REQUIREMENTS FOR VEHICULAR SPEED STUDIES, J.C. OPPENLANDER, W.F. BUNTE AND P.L. KADAKIA, HRB BULL. 281, PP 68-86, 1961. TRAFFIC CHARACTERISTICS ON ILLINOIS HIGHWAYS, ILLINOIS DIVISION OF HIGHWAYS, 1961.

Language

  • English

Media Info

  • Media Type: Print
  • Features: References; Tables;
  • Pagination: pp 78-80
  • Monograph Title: Travel time and vehicle speed
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00226990
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 13 2004 6:55PM