Robert Sullivan has driven across the United States some thirty times. His book is "Cross Country: Fifteen Years and Ninety Thousand Miles on the Roads and Interstates of America with Lewis and Clark, a Lot of Bad Motels, a Moving Van, Emily Post, Jack Kerouac, My Wife, My Mother-in-Law, Two Kids, and Enough Coffee to Kill an Elephant." He tells Jim Fleming how he does it, and what happened on the worst trip ever.