United States Department of Transportation
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Improved dual-loop detection system for collecting real-time truck data
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2005-02-01
[PDF-2.06 MB]
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Alternative Title:Improved system for collecting real-time truck data from dual loop detectors
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Edition:Final Report
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Abstract:The WSDOT’s dual-loop detector’s capability of measuring vehicle lengths makes the dual-loop detection system a potential real-time truck data source for freight movement study. However, a previous study found the WSDOT dual-loop detection system was not consistently reporting accurate truck volumes. (Truck volumes estimates by basic length category are developed from the vehicle length measurements produced by the dual-loop detectors.) The problems include undercount, over-count, and misclassification.
As an extension of the previous study, this research project investigated and identified possible causes of dual-loop miscount and misclassification under un-congested traffic conditions. A quick remedy method was proposed to improve the performance of the dual-loop detection system without replacing any part of the current system hardware or software. A new dual-loop algorithm that can tolerate erroneous loop actuation signals was also developed to improve the performance of the WSDOT loop detection system.
The improved dual-loop detection system will provide reliable timely truck volume data. WSDOT will benefit from this work by gaining more reliable volume and vehicle classification data without having to resort to any other traffic detection technologies.
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