SAMPLE SIZE REQUIREMENTS FOR VEHICULAR SPEED STUDIES, J.C. REFERENCES' APPLIED GENERAL STATISTICS, 2ND EDITION, F. 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.
HOWEVER, A RELIABLE ESTIMATE OF STANDARD DEVIATIONS PERMITS THE USE OF THE EQUATION FOR DETERMINING SAMPLE SIZE. THE MEASURE OF SPEED VARIABILITY CAN BE OBTAINED FROM THE RESULTS OF PREVIOUS SPEED SURVEYS. 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 EVALUATION OF SPEED CHARACTERISTICS IS ACCOMPLISHED BY A SAMPLING SURVEY AND A STATISTICAL ANALYSIS.
IN THE ESTIMATION OF TRAFFIC CHARACTERISTICS BY A SAMPLING TECHNIQUE, THE DESIGN OF EXPERIMENT REQUIRES THE DETERMINATION OF AN ADEQUATE AND ECONOMICAL SAMPLE SIZE. SAMPLE SIZE DETERMINATION FOR SPOT-SPEED STUDIES AT RURAL, INTERMEDIATE, AND URBAN LOCATIONS
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