Quote Originally Posted by Foz
What determines how many land trade routes you can have, or how far away they're allowed to go? Are each province's land trade partners limited to provinces on its borders, or could the route pass through some other province to get to a better one? Also, do roads affect the trade process at all except for the ~10% income bonus overall?
Good questions all.

But I don't have any answers. I wonder if land trade works something like sea trade, though, in that upgrades "enable" more trading partners. Maybe the market line is doing this too? It's hard to test.

Hmm, might be able to by saving, then destroying an advanced market and seeing what drops on the trade chart. The problem is getting a static test bed then altering the state of the one region while everything else remains constant.