Answer:
Used left or right, I get to travel over cobblestone or gravel. Used up, I vie for sweet success, used down, I cause men great duress.
What doesn't get any wetter, no matter how much rain falls on it?
Though blind as well, can lead the blind well.
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has handsอพ lacks a head but has a face.
What can be swallowed, But can also swallow you?
If itโs information you seek, come and see me. If itโs pairs of letters you need, I have consecutively three. What am I?