This is the observation I wrote that this piece is based on.
“A bike path dark and empty was poorly lit by the sparse lights littered along the track. Alone, the distant sounds of the main road were drowned out , the loudest sound was the slow churning of the wheels and gears which was constant with each rotation. Riding over a flimsy metal grate produced two echoing thunks, one for each wheel. Some ten seconds later I hear the same two thunks well after I had passed them. Looking back I saw no one behind me.”