In this manual procedure, which is based on several established mathematical and traffic engineering relationships, the total time period of interest (e.g. cycle length) is first divided into a sufficiently small number of equal intervals. Then the vehicles that stop in each interval are tallied separately, and the midpoint of the interval is assumed to represent the average arrivals of the vehicles in the interval. The number of previously stopped vehicles departing is also tallied by interval. The departure of these vehicles is assumed to be randomly distributed in the interval. The results from the above procedure have been compared with those obtained by using time-lapse photography (where frame counts per vehicle were recorded). The theoretical soundness of the model is attested to by its analytic correspondence to the time lapse data. The means and standard deviations are nearly identical, and the correlation between the two procedures are uniformly high. The operational practicality of the method is reflected in a similarly consistent relationship between the timelapse film data and the manual application of the method.

Media Info

  • Media Type: Digital/other
  • Features: References; Tables;
  • Pagination: pp 45-46
  • Monograph Title: Capacity and measurement of effectiveness
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00162983
  • Record Type: Publication
  • ISBN: 0309025915
  • Files: TRIS, TRB
  • Created Date: Oct 13 1977 12:00AM