United States Department of Transportation
i
Improving stop line detection using video imaging detectors.
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2010-11-01
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[PDF-1.35 MB]
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Abstract:The Texas Department of Transportation and other state departments of transportation as well as cities
nationwide are using video detection successfully at signalized intersections. However, operational
issues with video imaging vehicle detection systems (VIVDS) products occur at some locations. The
resulting issues vary but have included:
• camera contrast loss resulting in max-recall operation,
• failure to detect vehicles leading to excessive delay and red-light violations, and
• degraded detection accuracy during nighttime hours.
This research resulted in the development of a formalized VIVDS test protocol and a set of performance
measures that agencies can incorporate in future purchase orders and use to uniformly evaluate VIVDS
products. It also resulted in the development of a VIVDS video library and conceptual plans for a field
laboratory for future projects to deploy a range of VIVDS products at an operational signalized
intersection. Researchers evaluated alternative VIVDS stop line detection designs and developed
methods for enhancing the operation of VIVDS through adjustments in controller settings for day versus
night versus transition periods, zone placement, and camera placement.
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