CARVER, Justice.
Richard Knott was convicted under a Dallas ordinance making it an offense to blink one's own car lights to warn motorists traveling in the opposite direction of a police radar trap set up to catch speed limit violators. We reverse because the State has legislated comprehensively on the same subject as the City's ordinance; consequently the City's ordinance on the subject was preempted and will not support Knott's conviction.
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