I wouldn't leave home without my DL. Never know when you might need it ... you never know what might happen along the way ... passport stolen, need proof of 2nd ID, airplane diverted for any unplanned reason, consider an airport shuts down and your only choice is to rent a car to get to the next closest airport ...... who knows ... but it takes up virtually no space. Just take it and then you don't have to wonder. Having said that, I've never used it for anything except renting a vehicle in Jamaica.