Flow Rate Estimation From Probe Vehicle Data and Sample Size Requirements

This paper describes the estimation of flow rate gleaned from probe vehicle data and the evaluation of sample size requirements. The author presents the estimation methods for three cases, depending on the available information on the percentage of probes and the flow rate: where the percentage is known but the flow rate is unknown; where the flow rate is known but the percentage is unknown; and where both parameters are unknown. For the first two cases, count data provide sufficient information to estimate the unknown parameters individually when the other one is known. For these two cases, simple analytical expressions are derived to analyze the accuracy and sample size requirements. However, when both parameters are unknown then additional information beyond count data is required. The author explains how the position of probe vehicles in a queue at signalized intersections is used as additional information in that case. The paper presents results that demonstrate for how long data need to be collected to estimate the parameters at acceptable confidence levels.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 12p
  • Monograph Title: ITS Connections: Saving Time. Saving Lives

Subject/Index Terms

Filing Info

  • Accession Number: 01142443
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 12 2009 11:22AM