Roads Reworked
Makes roads give A LOT more proximity (especially buffs earlier roads), but also makes roads cost around 20 times more than in vanilla (usually around few thousand ducats in early game between locations within one province), which makes roads feel like actual strategic investments with potentially massive benefit, rather than something you and ai just spam in every location for a miniscule bonus up until modern roads and railroads, where you spam it in every province for piss cheap for 100% proximity literally everywhere