"Life does not happen on the interstate."

Subtitled "a journey into America". A 1982 book by William Least Heat-Moon, about a long, meandering cross-country road trip through various small towns and off the beaten path parts of the United States, eliciting stories from the people, from the land, and from himself. Heat-Moon deliberately traveled, in his old pickup truck, on roads that were, once upon a time, marked in blue on maps.

My Rand McNally has such roads marked red or gray, I think - two of the larger and more famous of these roads are Route 66 and Highway 61, but the unfamous ones are even cooler.