While both Austria and Germany are members of the Schengen Area, which typically allows for border-free travel, as of early 2026, temporary internal border controls have been extended through at least September 15, 2026. This means that while you technically don't need a "visa," you must carry a valid passport (or a national ID card if you are an EU citizen) when driving across the border. German Federal Police and customs officers frequently conduct "spot checks" on major motorways like the A8 from Salzburg to Munich and the A12 Inntal axis. These checks are designed to manage security and migratory pressures and can occur at any time on trains or secondary roads as well. Third-country nationals (such as those from the U.S. or UK) should ensure their passport is not only with them but also valid for the duration of the trip to avoid entry refusal or fines during these legalized "random" inspections.