Answer:
I can be written, I can be spoken, I can be exposed, I can be broken.
What lies in a tunnel of darkness. That can only attack when pulled back?
He stands beside the road. In a purple cap at tattered green cloak. Those who touch him, curse him.
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has hands; lacks a head but has a face.
I don't think or eat or slumber. Or move around or fear thunder. Just like you I look the same but I can't harm you or be your bane.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?