Which of the following statement is correct about road highways?

The correct answer is option 2: In developed countries, every city and port town is linked through highways.

Option 1: Highways are metalled and unmetalled roads connecting distant places. This statement is incorrect because highways are generally metalled roads designed for fast movement and long-distance transport.

Option 2: In developed countries, every city and port town is linked through highways. This statement is correct because developed countries have highly developed highway networks connecting major cities and ports.

Option 3: The highways in North America are known as "autobahns". This statement is incorrect because the term “autobahn” is used for highways in Germany.