Research: Effects of Roads

[Severous]

Hi

Hope its OK to bump this old thread. I have some observations from my current campaign that are on topic...just a bit separated from the previous remarks.

RTW V1.5 No Mods. H/H Difficulty.

Thessolonica was enslaved. It is exporting Slaves to several adjacent regions.

Byzantium was occupied. So it doesnt have slaves and imports slaves via land from Thessolonica.

Thessolonica has dirt roads. Byzantium has none.

Income in both cities from this one route is 14. This rose to 15 as towns grew a bit. Its just slaves. No other resource is traded between the two cities.

Thessolonica constructed Paved Roads.
Its land income doubles on all other routes. But not Byzantium. Both cities continue to receive 15 income from the slave trade.Incidentally building a paved road did not increase Thessolonicas sea trade income.
Edit: Image added. Showing paved roads in Thessolonica but no roads in Byzantium



Byzantium then built dirt roads.
Byzantiums income from the slave trade with Thessolonica remained unchanged at 15. Thessolonica's income from this same route doubled to 32 (assume a fraction rounding up)