Detectors play an immediate first line of defense to detect a Wrong Way Offender.
One or more detectors may be used depending on the situation. Each detector (front line or confirmation) scans an area that it divides into three zones. When zone one is penetrated, flashers start on all signs and other detectors get put on notice.
When a confirmation detector is used, further validation will be done before notices
are sent to first responders.
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