Indirect Validation of Probe Speed Data on Arterial Corridors

Stanley Young, Sepideh Eshragh, Elham Sharifi, Masoud Hamedi, Kaveh Sadabadi

Research output: Contribution to journalArticlepeer-review

2 Scopus Citations


This study aimed to estimate the accuracy of probe speed data on arterial corridors on the basis of roadway geometric attributes and functional classification. It was assumed that functional class (medium and low) along with other road characteristics (such as weighted average of the annual average daily traffic, average signal density, average access point density, and average speed) were available as correlation factors to estimate the accuracy of probe traffic data. This study tested these factors as predictors of the fidelity of probe traffic data by using the results of an extensive validation exercise. This study showed strong correlations between these geometric attributes and the accuracy of probe data when they were assessed by using average absolute speed error. Linear models were regressed to existing data to estimate appropriate models for medium-and low-type arterial corridors. The proposed models for medium-and low-type arterials were validated further on the basis of the results of a slowdown analysis. These models can be used to predict the accuracy of probe data indirectly in medium and low types of arterial corridors.

Original languageAmerican English
Pages (from-to)105-111
Number of pages7
JournalTransportation Research Record
Issue number1
StatePublished - 2017

Bibliographical note

Publisher Copyright:
© 2017, SAGE Publications Ltd. All rights reserved.

NREL Publication Number

  • NREL/JA-5400-70601


  • probe speed data
  • roadways
  • traffic patterns


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