An International Driver's License is required at your travel destination if your driver's license if not in the language of the country you're visiting. Even if it is, an International Driver's License can make things run more smoothly at the rental counter. And if the police pull you over, they can read your license as it's written in 10 languages and serves as an officially recognized translation of your local driving license in over 150 participating members of the United Nations. You should always have your valid local driver's license and passport to show as well.