On the old highway maps of America, the main routes were red and the back roads blue… — William Least Heat-Moon

On the old highway maps of America, the main routes were red and the back roads blue. Now even the colors are changing. But in those brevities just before dawn and a little after dark-times neither day nor night-the old roads return to the sky some of its color. Then, in truth, they cast a mysterious shadow of blue, and it's that time when the pull of the blue highway is strongest, when the open road is a beckoning, a strangeness, a place where a man can lose himself.