There are several signs here in northern Baja California, Mexico, that reference cities in both Mexico and USA e.g. Tijuana and San Diego, and once in Tijuana most signs will have San Diego and an area or street in Tijuana rather than a city.
But there are definitely some, particularly close to the border, that have both Tijuana and USA.
One example I could find an image of easily was a pedestrian sign
Same on the other side where it may say Chula Vista and Mexico or San Diego and Mexico.
Yes, they do exist. The first situations that come to my mind are:
There exists plenty, even if they are way common than in old times.
Scope of road signs is not always the same, but generally they should help you move to a destination and at the same time give you a general sense of your position. And you, as a driver, back in the days, had no GPS, few highways, and was traveling by landmarks.
In this case, for example:
And just remember this is the border in France ages before GPS, Schengen, highways (at least in France) and so on. It’s not like today, that you can cross the border everywhere, on a major highway connecting two nation, and things like that.
Ok, here we go. Sadly I couldn’t find the exact one, but this is the same just in the opposite direction:
This is from the Italian side of the border.
Sure they do, here’s a few:
(credit ojdo.de, CC licensed)
However, these are uncommon for anything larger than city states, because drivers are usually trying to go a specific city, not an entire country. In the second sign from Stockholm’s ferry terminal, you’ll note that “Tallinn” (Estonia), “Riga” (Latvia) and “St. Petersburg” (Russia) are listed individually, but “Finland” is listed as a country because there are services from Stockholm to both Turku and Helsinki.
Credit:stackoverflow.com‘