You've seen them on the side of the road: woodland fairies, leprechauns, Easter bunnies, cheerleaders, baseball players, and hula dancers. Also pandas, bumblebees, ladybugs, grapes, the Statue of Liberty, witches, pumpkins, hearts, Dorothies, tuxedoed gentlemen, and snowmen. They dance and gyrate, twirling signs and causing a scene. It's old-fashioned advertising at its finest. Passing drivers can't help but take notice of these peculiar characters. We are called human directionals, and we are not hired simply…