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.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1963/35/35-004.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.
• Authors:
  • Oppenlander, J C
• Publication Date: 1963

Language

• English

Media Info

• Media Type: Digital/other
• Features: References; Tables;
• Pagination: pp 78-80
• Monograph Title: Travel time and vehicle speed
• Serial:
  • Highway Research Record
  • Issue Number: 35
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Four lane highways; Rural areas; Sampling; Spot speed; Standard deviation; Statistical analysis; Statistical sampling; Studies; Traffic speed; Two lane highways; Urban areas
• Uncontrolled Terms: Sample size
• Old TRIS Terms: Determination; Speed studies; Spot speed study
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management;

Filing Info

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