I think roads could be an extremely important part of the game if they were engineered to be so. Now, here is how I think roads should work.
1) They increase travel speed
2) Tracks are not as easily made on a road, especially if it is made of stone.
3) The world is connected to roads.
4) Forests and mountains should conceal armies, so that nearby roads could in danger of attack.
5) The world revolves around roads. Armies, merchants, and travellers use them to get around.
6) Roads connected to aligned cities are fixed with a side, unless both ends are different sides, in which case this probably means that route could be a focal point for warfare.
7) Neutral Merchants would try to avoid dangerous roads and trade with different cities, but aligned merchants attempt to supply allied cities, provided escort is available.
The basic idea is to associate the wellfare and enconomy of Calandria's cities, depending on what is happening along the roads. As such, merchants and other people collect news and resources, and moving manpower around. (hiring, dismissing troops)
EX: An merchant is at Praven, recently arrived from Rivacheg. This person is in the local tavern, and the player being the charismatic sort gets into a discussion with the merchant. The merchant is saying that Rivacheg is where the slave trade is at right now, since there are many battles going on in that area that has resulted in additional merchandise.
CALANDRIA DIVIDED INTO FACTIONS, BASIC CONCEPT
MOCKUP OF THE ROAD NETWORK