Sam Leith's guest for this week's Book Club podcast is Joanna Pocock, whose new book Greyhound  describes two trips she took across America by Greyhound bus in 2006 and 2023. They talk about the literature of the road, that distinctively American and usually distinctively male genre, and the meaning of travel – and Joanna tells Sam how the America you see from a Greyhound differs from the one you see on television; and how dramatically it has changed even over the last couple of decades.