It is illegal to show R-rated movies at a drive-in theater if visible from a highway.

The Law Explained

As drive-in theaters became popular hangouts in the mid-20th century, lawmakers grew concerned about passing motorists getting an unexpected eyeful of mature content. A statute was passed mandating that screens showing explicit or R-rated films must be completely obscured from public roadways to prevent distracted driving and protect the innocence of passing minors.