Like Raef said, the most important aspect of 'directional type' is readability. I spotted this billboard on John and I's way home from our afternoon adventure, and snapped a shot of it from the car. The arrow on this billboard really caught my eye because of it's boldness against the darker background. Also, the arrow reminded me of a street, and the copy were cars driving along it....don't question, just stare at it. The large scale of the arrow catches the viewers attention, while the copy within the text draws the viewers eye along the length of the arrow and ultimately pointing in the direction where the Brakes, Tires, and Detail, could happen. I think it's pretty groovy how the copy within the arrow not only tells us what the service shop has to offer, but it guides us to it.