Port systems and ports play a key role in connecting different roads and enabling global trade. In today's world, successful business in the field of transport requires a high level of efficiency in building infrastructure and organizing logistics processes. The development of port systems requires continuous investment of effort and resources in order to adapt to rapid changes and implement new technologies with the aim of maintaining a competitive position in the global market. The integration of ports with transport infrastructure and key transport corridors is essential for creating a high-quality and efficient port system. Ports are places of origin and destination for carrying out activities at sea and their purpose is to transport cargo, disembark or embark passengers, replenish supplies for the ship, etc. Commercial ports differ from each other even though they perform the same activities. In order for individual ports to stand out and be competitive on the world market, it is necessary to follow trends, improve and renew infrastructure, find quality workforce and provide a good working environment. Key centers for the movement of goods and transport routes are ports, which today play a key role in connecting all countries of the world through trade activities. Within seaports, container terminals are being developed, which serve as the main hubs for the transportation of most of the world's goods. The Northern Adriatic traffic route is the shortest and most economical route that connects Europe with the Mediterranean, enabling navigation to the Suez Canal and most countries in Asia, Africa and Australia. This transport route creates a connection between two different economic worlds: developed countries in Western Europe with developed industry and Asian-African developing countries, especially prominent countries with great economic potential, such as China, South Korea and Japan. This paper will describe the role of the ports of Rijeka, Trieste and Kopar as hubs of transport flows on the northern Adriatic traffic route.