FairWarning: No criminal charges will be filed against billboard giant Lamar Advertising Co. despite evidence that company workers in Tallahassee over at least seven years secretly chopped down or poisoned trees to provide clearer views of its roadside signs.

FairWarning: As long as there have been billboards, trees have been getting in the way. And billboard companies have been removing them — sometimes legally, sometimes not.

FairWarning: Billboard companies are moving aggressively to plant digital signs along U.S. highways and city streets. But debate persists on whether the eye-grabbing displays, which typically change messages every six to eight seconds, pose a risk to traffic safety.