United States Department of Transportation
i
Performance evaluation of traffic sensing and control devices.
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2011-01-01
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[PDF-5.78 MB]
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Alternative Title:Joint Transportation Research Program Technical Report Series : Civil Engineering
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Abstract:High quality vehicle detection is essential to properly operate actuated phases at traffic signals and to facilitate effective
management of technician and engineering resources. INDOT operates over 2600 traffic signal controllers, approximately 2000 of
which use some form of vehicle detection. The private sector continues to develop innovative sensing technologies that may
potentially benefit Indiana motorists and taxpayers by improving system efficiency and lowering installation and maintenance costs.
However, the acceptance of new sensing technology requires careful evaluation because to ensure that they provide robust
performance 24 hours a day, 365 days a year, with minimal impact on maintenance resources.
This study developed a technical protocol for evaluating vehicle detector performance and applied those techniques to both video
detection (in partnership with Texas) and wireless magnetometers. Based on experiences in designing the detector test bed,
recommendations are given for stop bar detection zone design using wireless magnetometers. Additional results include a detailed
study of the inductive loop detector sensing range for several loop geometries, and an innovative method for interrogating NTCIPcompliant
traffic signal systems to allow quality control on signal timing plan implementation. Since this project spanned several
years, interim results were documented in the professional literature as they became available. This technical report summarizes
those results and provides references to the published papers.
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