Step 1: Understanding the Concept:
This question asks for the specific term used to classify roads constructed along the frontiers or international borders of a country.
Step 2: Detailed Explanation:
Let's define the terms:
1. International Roads/Highways: These are major roads that cross international boundaries, connecting two or more countries (e.g., the Pan-American Highway).
2. District Roads: These are roads within a district of a country, connecting major towns and production areas with state or national highways.
3. Border Roads: This is the correct term for roads constructed parallel to and along the international boundaries of a country. They are of strategic importance as they facilitate the movement of military personnel and supplies to defend the borders and help connect remote border areas. Many countries have a special organization for their construction and maintenance (e.g., India's Border Roads Organisation - BRO).
Step 3: Final Answer:
Roads laid along international boundaries are called Border Roads.