. "driver-only-operated" . "driver-only operation" . "One-person operation" . "driver-only operated" . "\\\"wanman\\\" operation" . "driver only" . . "OPO" . "One-person operation" . "wanman driver-only operation" . "wanman (driver-only) operation" . . "one-person operated" . "one-man operation" . . "one-person-operated" . "one-person operation" .