>>725382325
They do raise proximity. You get a proximity reduction of 40 when passing through one location to another, but if there is a road, it is reduced (by 25 - to 15 in my case). So where you'd have proximity of 60 without road, you'd have 85 with it (not counting modifiers...). Just make sure there's sense in building the road because many locations are reached by sea easier than even if you do build a road. You can check how a location is reached by clicking on it while in proximity map mode.