All Central American countries (Mexico to Panama) have a stop sign with marked "ALTO"
South Amercia
All countries in South America (Brazil, Colombia, Argentina, etc.) have a stop sign with marked "PARE"
Peru
In Peru the poles to hold the panels are black and white
Romania/Brazil/Ukraine
In Romania, Brazil and Ukriane the bottom of the poles is often painted white
Canada
In Canada for speed limits they use "maximum"
USA
In USA for speed limits they use "speed limit"
Mexico
In Mexico the posts are mostly octagon (8 faces)
Tunisia
Tunisia speaks Arabic and French. It is then the only country where there is marked in Arabic and in Latin alphabet on the panels
South Korea
In South Korea, part of the poles is often covered with yellow and black lines
Taiwan
In Taiwan the poles are also covered with yellow and black lines as in South Korea (in Taiwan it's more orange). If the pole is covered all the way down or the sidewalks are also covered, it's Taiwan
Japan
These black and yellow vertical lines on the bottom of the poles are unique to Japan
Thailand
In Thailand many poles have black lines at the base
Thailand
Signs are often on square white posts with black bottoms
Uruguay
Uruguay panels are often on white square posts (there are often holes behind)
South Africa
In South Africa the bottom of the poles is often black
Hungary
In Hungary you can see concrete blocks fix to electric poles
Sweden
In Sweden, many warning signs have the particularity of being blue with white stripes.
Sweden / Finland
To differentiate Sweden and Finland from other countries, both have their signs with a yellow background
New Zealand
In New Zealand, the electric poles have a metal protection in the center