Test of Heimdall detector in Winchester

A Heimdall video vehicle detector was installed adjacent to a standard SCOOT inductive loop detector in Winchester. Outputs from the two detectors were returned to SCOOT and recorded for analysis. The inductive loop output was used in the SCOOT control algorithms as normal, but the trial Heimdall detector was ignored by them. The status of both detectors, off or on, each quarter second was output in standard SCOOT messages and compared. When comparing the outputs, allowance was made for potential differences in the processing times of the two detectors and small differences in the location of the detection zones.