1. Roads play an important role in carrying goods and passengers for short, medium and long distances.
2. It is highly suitable for short distance services.
3. It is comparatively easy and cheap to construct and maintain roads.
4. Road transport system can establish easy contact between farms, fields, factories and markets and can provide door to door transport services.
5. They are the most universal mode of transport. Indian roads are cost efficient and used by all sections of people in the society.

Trade carried on between two or more countries is called international trade. It is also called as external trade or foreign trade.

Communication is a process that involves exchange of information, thoughts and ideas.
Communication is categorized into
(1) Personal communication and
(2) Mass communication

National Waterway 1: Ganga - Bhagirathi - Hooghly river system
National Waterway 2: Brahmaputra river between Dhubri - Sadiya
National Waterway 3: Kollam - Kottapuram in the state of Kerala.

Pipelines provide a very convenient mode of transport to connect oil and natural gas fields, refineries and to the markets. Solids can also be transported through a pipeline when converted into slurry. The initial cost of laying pipeline is high but subsequent running cost is minimum.

1. Railways promotes national integration by bringing people together.
2. It also promotes trade, tourism, education, etc.
3. Railways help in the commercialization of the agriculture sector by facilitating the quick movement of perishable goods.
4. Its role in transporting raw materials to industries and finished goods to markets is invaluable

Migration is the movement of people across regions and territories.
The types of migration are:
(1) Internal migration (within a country)
(2) International migration (between the countries).