“I can't see the sign...”

Have you ever wondered how traffic engineers know how tall to make the letters on a freeway sign so that you still won’t miss the exit? Or how far away a person walking in a downtown street will see the entrance to that awesome new sushi restaurant? Or why you can see the Las Vegas strip signs from a mile away?  These are questions we know keep you up late at night pondering the wonders of signage and letter heights.