The roads laid along international boundaries are called :

The correct option is Border Roads.

To understand why this is the correct answer, let us look at the definition and purpose of different types of roads:
1. Border Roads: These are roads constructed and maintained along the international boundaries or border areas of a country. They play a critical role in strengthening national defense, facilitating the movement of military personnel and equipment, and accelerating the economic development of remote border regions.
2. International Highways: These are major road networks that connect different countries across continents (such as the Asian Highway Network), but the specific term for roads laid along and servicing international boundaries is "Border Roads".
3. District Roads: These roads connect district headquarters with other places within the same district and have no connection to international borders.

Therefore, the roads laid specifically along international boundaries are termed as Border Roads.