question: Why was the handle considered a `` dead man switch '' ?
answer: if the operator let go of the handle , it would return to its upright position , causing the elevator cab to stop
turker_answer: The handle was considered a `` dead man switch '' because if the operator let go of the handle , it would return to its upright position , causing the elevator cab to stop .
rule-based: The handle was considered a `` dead man switch if the operator let go of the handle , it would return to its upright position , causing the elevator cab to stop '' .