Infrastructure land speed bonus in 1.5

do infrastructure land speed bonuses affect troops all through the journey in call of war or only like when they are crossing this specific province

A better way to illustrate my question is: If i build infrastructure in a province that is located far from my destination would it help to build infrastructure int the province where it is manufactured greatly meaning just because it passes through there it is faster than it would be just a few minutes outside the province without the boost