The title comes from the story of the highway designers trying to create a sign drivers would see as they exited a long tunnel. Experience had shown that often a driver would exit the tunnel, stop during daylight hours at the next tourist attraction, and find the car battery dead. As I recall, the book showed a list of the bungled attempts to alert the driver to the condition of the car’s headlights. Too wordy, too much information. Finally someone came up with the simple question which allowed the driver to make his own decision. There are several other wonderful examples in the book.