Driven to distraction: New rules limit those humorous state highway signs

Over the years, the FHA has flagged signs it said could cause confusion. In rules issued last month, the agency gives states two years to phase out signs that have 'obscure' meanings or use pop-culture references that could require drivers 'greater time to process.'

But in the last several years, states have been using electronic billboards that show traffic and weather alerts...Sometimes they ramp up their messages with a little more zip.

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