In Belgium, you're not allowed to say you see traffic cameras on the highway. Result: people replace the word with something else: falling stars. So in Belgium

In Belgium, you're not allowed to say you see traffic cameras on the highway. Result: people replace the word with something else: falling stars. So in Belgium on the radio they announce falling stars on highway E19 north of Antwerp. Everyone knows the meaning. In Germany, you must only give a positive review as reference for a job application. Result: scale changes: 'performed' (worst), 'performed well' (OK) 'performed extremely well' (satisfied) -- with various levels of exaggeration. Everyone knows the meaning. In both of these situations an authority who is known (radio host, employer) are a filter of information and purposefully use the wrong terminology to address the issue in a truthful manner. The problem is that curation costs resources (time/money/energy) which you may or may not have scarcity of. I'd say multiple reports of same location warrants a usable sign, but Micah Lee's experience says otherwise: still usually false positives due to people panicking and not analyzing the situation correctly.