Sorry, when I typed that I was a little bit tired, so it did not come out in perfect english (And I am a little bit tired now
)
I did understand that you wanted to put up an upkeep on roads, and that you wanted to do it as to limit road spam.
I still hope it does not come up at high costs, I really didn't like this certain "feature" off Civ 5.
On the other hand, I played a game called "Alpha Centauri", and roads where free on upkeep, (even railroads), the disadvantage by spamming them all over your empire was that the enemy had the same use of them as you had, so if your whole land was a road-mess, the enemy units would just blitz all over you land picking off the weakly defended cities first, or just smashing all your farms (resources) to bits.
I do think that right now roads would be a real big pain to defend, and units move far too much on the overland map with some proper misusage of movement speed spells, like the AI does on higher challenge levels
. So I think personally its a very good choice to limit road usage in my own borders to myself, (Don't talk realistic, or ill actually have to use my time researching silly subject
) as to give me atleast 1 turn warning that they are going to attack my big town with 5 tile wide borders.
I also think that if you made a rumoured upgrade system to outposts, to have "military bases" or what you want to call them, in which you can place on your roads, and make a defendable position, (like an outside the city fort), you would have done much for the players to be able to defend theyre roads (and resources) and would be one step closer to removing the limiting of roads to the player in which zone of control the roads are in.
In the end, I just want to see the new economics system before knowing whether roads would be affordable, right now I feel my economy have no space leftover for anything except more military units or special buildings, so I might be surprised.
Sincerely
~ Kongdej