Do people in northern states not flash brights to warn for cops?

Posted by FomerWeightPusher@reddit | AskAnAmerican | View on Reddit | 582 comments

I’m a TN native and people very frequently flash high beams especially at night to warn for THP or other bodies of law enforcement ahead or hazards in general. My sister moved to Wisconsin, so last month I went up to visit and I swear to god north of the Ohio river nobody does it anymore.

Is this just a south thing? Do you do this?