0 the roads you follow to get from one place to another place -- ルート, 道筋, 路線
1 in the US, used as part of the name of numbered roads -- ~号線(道路・高速道の名前)
Route 66
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
道路がどれだけ長くても、一歩一歩完了することができますし、足跡をマークしなければ、道路がどんなに短くても完了することはできません。