In Portugal pumping gas is a self-service affair. It is important to pay in cash, as some gas stations may not accept the magnetic swipe cards common in the U.S. (The ones that do accept these cards will encounter a surcharge of 50 Euro cents.)
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Portuguese traffic lights follow the conventions of the Vienna agreement and so should be familiar to most drivers. You cannot turn right on a red light unless indicated and you should also be aware that many local drivers run red lights.
Roundabouts may have lanes but don't expect anyone to use them properly. Always give way to drivers already on the roundabout, whichever lane they are in and don't expect the lanes to merge into exits as they do in the UK. You have to actively switch lanes in Portugal otherwise you'll just end up driving in circles!
U.S.Citizens are entitled to drive in Portugal with their U.S. issued driver's license for a period no to exceed 185 days, provided they are not legal residents.