Which pairs of countries are connected by land but can't be connected by car?
Can't be connected by car = a regular individual can't drive a regular vehicle between the two countries, including via another country.
I'm not interested in the case where driving is made impossible because of some military conflicts, e.g with North Korea.
I'm aware of (Panama, Colombia). Is there any other such pair of countries?
Best Answer
The Italian Republic and the Vatican City State
Wikipedia states
The Vatican City State, also known simply as the Vatican, became independent from Italy with the Lateran Treaty (1929), and it is a distinct territory under "full ownership, exclusive dominion, and sovereign authority and jurisdiction" of the Holy See, itself a sovereign entity of international law.
The page Travel to Vatican City states
Driving: In Vatican City, they drive on the right side of the road, but it is highly unlikely that you will ever drive inside the Vatican. The only way the public can drive in the Vatican is if you’re there on official business and enter a via parking lot near St. Ann’s.
So it qualifies under OP's conditions
a regular individual can't drive a regular vehicle between the two countries
there is no ongoing military conflict preventing it
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Answer 2
Various Antarctic territorial claims provide "land borders" that cannot be crossed due to the lack of roads, including:
- Australia & New Zealand (160°E)
- Australia & France (142°2?E and 136°11?E)
- Australia & Norway (44°38?E)
- Norway & United Kingdom (20°E)
None of these countries share a land border anywhere else in the world, of course. EDIT: As was pointed out by Nate Eldridge in the comments, it is possible to drive from Norway to Gibraltar, which is also a British Overseas Territory; so the last of these does not qualify.
For the purposes of this question, it is probably best to draw a discreet veil over the conflicts between the claims of Chile, Argentina, and the UK, as they make the concept of a "border" ill-defined. The Chile-Argentina border on the South American continent is relatively easy to cross anyhow.
Answer 3
Singapore and Malaysia are connected by a causeway and a bridge, with the Causeway in regular times being the world's busiest border crossing by some measures.
However, due to COVID-19, for time being both are completely closed to private passenger vehicles: the only way to cross is by designated bus services.
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