This replaces the regular dirt road texture with a blank file.
I dislike the dirt roads since they don’t match any other terrain … also the fact that roads in general have to be exactly straight and at 90° angles. Since my current town happens to be built mostly on sand, making the roads invisible gets rid of that issue (but the road is still there, so the game speeds up the villagers like it normally would).
Unfinished dirt roads still have a light overlay (visible on the screenshot at the bottom); I found that useful to be able to see where there’s roads already in the works. This overlay disappears once the road is finished.
Should work for any game version (as long as they don’t change the name of that texture).