As an automaker and tire manufacturer, Henry Ford and Harvey Firestone had plenty of incentive to make sure America’s roadways were suitable for cars. Jeff Guinn joins host Krys Boyd to talk about how the pair teamed with Thomas Edison for a series of road trips – and how those trips helped make car ownership a way of life. Guinn’s new book is called, “The Vagabonds: The Story of Henry Ford and Thomas Edison’s Ten-Year Road Trip” (Simon & Schuster).