Evaluation of dual-loop data accuracy using video ground truth data
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2002-01-01
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Alternative Title:Dual loop error
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Edition:Research report
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Abstract:Washington State Department of Transportation (WSDOT) initiated a
research project entitled “Monitoring Freight on Puget Sound Freeways” in September
1999. Dual-loop data from the Seattle area freeway system were selected as the main data
source for this project. However, preliminary verification tests performed on the dualloop
data indicated that the data were not reliable; therefore, the truck movements
estimated by the dual-loop detectors on the Seattle FLOW system failed to represent the
real freight activities. Consequently, a part of the WSDOT freight project had to be
shelved.
If sufficiently accurate, dual-loop detectors can be very cost-effective collectors
of real-time vehicle-classification and speed data. This report describes a
WSDOT/TransNow-funded study that addresses the problems with the existing detection
system encountered by the original freight study, and recommends remedial actio ns to
rectify these problems. The researchers 1) investigated the level of inaccuracies in the
existing WSDOT dual- loop freeway detectors, 2) identified the types and potential causes
of these inaccuracies, and 3) proposed methods to effectively improve the quality of the
dual-loop data.
The objectives of the project were to 1) identify a station of good dual-loop
detectors to represent the WSDOT system, 2) quantitatively analyze the data collected
from the selected station and determine the accuracy of the sample dual-loop
measurements for vehicle volumes and vehicle classifications, 3) identify the types and
potential causes of the observed inaccuracies, and 4) recommend appropriate methods to
improve overall dual-loop data quality.
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