If a driver looks down for just one second while driving 65mph, their vehicle has traveled almost 50 feet?

But we pulled at the grill [on the ground] and it gave way. and then we saw iron rings as steps leading down a shaft into a darkness without bottom. … it was a great tunnel. its walls were hard and smooth to the touch; it felt like stone, but it was not stone. on the ground there were long thin tracks of iron, but it was not iron; it felt smooth and cold as glass. we knelt, and we crawled forward, our hand groping along the iron line to see where it would lead. but there was an unbroken night ahead. what is the most likely explanation for the walls described in the bold text?

Tu es venalicius; tu servos in foro (vendo,vendis,vendit)

The scernio an example of which step in the five step model of communication jack: it was nice to meet you