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Evaluation of Freeway Traffic Data Acquisition: Technology, Quality, and Cost

Other Titles
A Comparative Analysis of Alternative Travel Time Data Sources on I-80 Freeway
Author
Zhang, Michael; Hou, Zenghao; Zhang, Xingyang
Abstract
This study evaluates the accuracy of the travel time data that are estimated by Dual loop,
Waze, HERE, and INRIX against Bluetooth data on multiple segments of the I-80 freeway
between Davis and Sacramento, CA. We conduct a simulation-based critical sampling rate
analysis, which suggests that the Bluetooth travel time data qualifies for approximating the
ground truth. Further, we apply evaluation methods and derived indices, Travel Time Error Bias
(TEB), Average Absolute Travel Time Error (ATE), and Standard Error of Mean (SEM), to
compare the travel time data reported by Waze, HERE, and INRIX with the benchmark
(Bluetooth) data on the selected testing segments on I-80. The results show that the INRIX and
HERE data closely match the Bluetooth data, both in the trends and values of reported travel
time. Moreover, all three vendors’ data accuracy deteriorates when the traffic congestion
intensifies.
Description
Final Report
Sponsorship
California Department of Transportation 69A3551747119
Date Issued
2020-03-04Subject
Travel time; Dual loop; Bluetooth; INRIX; HERE; Waze; Data quality evaluation
Rights
Attribution 4.0 International
Rights URI
Type
report
Accessibility Feature
alternative text; captions; reading order; tagged PDF
Accessibility Hazard
unknown
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as Attribution 4.0 International