Driving in Portugal as an American is generally considered manageable, but it presents specific challenges that require focused attention. On the positive side, Portugal drives on the right side of the road, and the major highways (Autostradas) are world-class, well-maintained, and feature clear signage. However, the difficulty arises in historic city centers like Lisbon or Porto, where streets are incredibly narrow, steep, and paved with slick cobblestones. Furthermore, most rental cars in Portugal are manual transmission; if you require an automatic, you must specifically book it in advance and expect to pay a premium. American drivers must also get used to "roundabouts," which are ubiquitous and follow strict yielding rules. Speed cameras are frequent, and the Portuguese driving style can be more aggressive than what many Americans are used to on suburban roads. To ensure a smooth experience, it is wise to obtain an International Driving Permit (IDP) from AAA before leaving the U.S., as it is legally required in Portugal alongside your standard state license, and always opt for the smallest car possible to navigate the tight village roads.