Danube in Linz
The comprehensive road network was one of the reasons why the Romans could keep their power in the whole Mediterranean area for a long time. To supply all people with food in Vindobona's area, active trade from near and far developed. Besides waterways, therefore, well-constructed roads were required. In border disputes or internal revolts, the quick mobility of troops was possible. Vindobona was linked to all main roads (like the one to Italy - the Amber road) and regional transport routes.
Soldiers were often tasked with the construction and maintenance of roads. The necessary funds were often donated by magistrates of a particular civil township.
Roman road in Aquileia
There, along the upper and middle Danube were: legionary fortress, watch towers, which were connected in defends system of Noricum and Pannonian limes. Apart from numerous military bases, there were custom stations on this main border road. They controlled trade with transdanubian people. From these starting points of the Roman frontier, the amber route, led merchants to the south coast of Baltic Sea. Earlier trade of amber was one activity of Celts. Celts adapted inventions to their needs. Skills of finding raw materials became opportunities to functioning trade and craft centres. Those settlement (oppida) made the trail net, where intense trade exchange took place. They guided towards to the mouth of the Odra and Vistula, and to groups of settlements on the western shore of Gdansk Bay.
Romans used some of those local trails, which adapted to their needs. Roman reached even the Sambian Peninsula for amber called "the gold of the north" or the "baltic gold".
Baltic coast on the Sambia
Trade exchange along amber roads and routes (crossings by Danube) connected communities which were located hundreds of miles apart between the Adriatic Sea and the Baltic Sea.
Wien - Klosterneuburg (photostory)