Cardinal Advertising Sin #1,771: Stuffing too much on your billboard.
Why is it you occasionally see billboards that attempt to be brochures? Is their message so important that it couldn't possibly be distilled down into a couple brief phrases? Is their key message so complex? When you get ready to make your billboard investment, don't insist your billboard becomes more than a billboard. A message received from a billboard is geared toward the audience on the go—and they're usually going over 70 miles per hour. Keep it eye-catching, short, and simple for greatest impact.