I’ve taken my time to mark in black the modern day roads in Romania that were build on top of the ancient Roman Road system in order to highlight the fact that they remained in use since those times except the roads in the Lower Danube marked with colour red
I’ve also highlighted on the map with red circles the Seats of the German Saxon Settlers of Transylvania (Transylvanian Saxons - Wikipedia) during the Medieval times. This is to connect the establishment of rule of the Medieval Hungarian Kingdom in the region to the preexistence of a Roman infrastructure that made it easier to speed up an economy from
Note that the Hermannstädter Hauptstuhl (German Saxon central seat) modern day Sibiu lays at the very nodal point that connects the principal Roman road along the river Olt to all the other inner seats of Siebenbürgen. This is a very visible indication of the importance of its commerce with Wallachia during the Middle Ages
Surprisingly, the ancient Roman road along the River Mures was never used for the early colonization of the region. That is also suggestive that just as the pass though the Carpathians via Olt, the Mures pass was also well guarded
The famous battle of Possada that marked the beginning of Wallachia, was fought as the name suggests (a pass) at the entrance of the Olt pass as seen from Wallachia
The density of the Roman roads in the Burzenland (in the close vicinity of Brasov) is surprising. As it was in the remote past, the region was a major commercial gateway connecting the lower Danube (Paristrion) to Transylvania. Only one segment of road that connects that region to Paristrion was discontinued since. Note that there is no direct straight line connection from Buzău to Fetești
All, if not most of the roads that ones connected a flourishing province of Paristrion (or Moesia Inferior) with the southern provinces of the Roman Empire are no longer in use. That is a clear indication of a very troubled past. That region was devastated by the Goths, Huns, Avars, Slav, Bulgars, Petchengs, Uzes, Cumans, and Mongols over 1,000 year of ferocious nomadic raiding. Romanian archaeologists, and not only, are actively researching the region to piece together clues of what happened in the region to have collapsed into a desert