Picture of a reckless driver as they approach saying “Your a JERK AND MUST EXIT THE FREEWAY IMMEDIATELY” and for slow drive a picture of them driving say “MOVE RIGHT GRANDMA”

The board would span the freeway every 5 miles taking pictures of the guilty and flashing their picture until they get a clue.

And a large dart gun that would shot red rubber dart that would stick to their car for all to see.