Two, apparently, when one of them is David Willis of the BBC's Los Angeles bureau. James Gordon of the New York bureau is in the driver seat. They "show us there's more to learn about driving in America than simply staying on the right side of the road," says their backseat producer. "Filmed (secretly!) in the backseat by yours truly. (October 2008)" Video link
Also this week: BBC correspondent Kevin Connolly signs off the America beat with a visit to the Minnesota meat-packing town where spam is made and celebrated.