Vehicle presence detectors have become critical elements of traffic management systems, including applications ranging from intersection signal control to freeway congestion monitoring. The need to assess the accuracy and attributes of each of the many types of sensors motivated the California Department of Transportation to construct the Traffic Detector Testbed on I-405 in Southern California. With up to ten detectors of different types under concurrent test in each of six lanes, a means for

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... utomating the testing process became imperative, since traditional humanverification methods were not practical. This paper describes the design and implementation of an automated data acquisition and verification system that processes data from all detectors along with that of a reference image processing system, to create a composite ground truth record against which individual detector performance is assessed. The system architecture, data fusion methodology, computer vision methods, operator interface and system performance results are discussed.