I am not American so I have never bothered reading the forum article Americans driving in Portugal until today. It contains a number of errors, two such errors are;
Some of the road signs depicted have misleading titles, one example being the round blue sign with 30 in white numerals on it is titled "speed limit". If you see that sign and reduce your speed to ensure you are travelling at less than 30 you will be fined. What that sign depicts is the MINIMUM speed you must travel at. (A square blue sign with white numerals is an ADVISORY speed limit and is usually found on the approach to bends.)
An actual speed limit sign is round with 30 (or another number) in black numerals on a white background with a red border.
More concerning is this sentence;
There are a lot of handicapped spots and they are on an honor system. If you are old, handicapped, pregnant or have a young family, you can park there.
Disabled parking bays have never been on an honour system. Parking in one without the appropriate disabled person's permit is classed as a SERIOUS offence. It carries a fine of €60 to €300 and 2 points removed from your driver record (you start with 12).
This offence is committed even if the parking bay is on private property (e.g. a supermarket car park).