Power Line Works In Progress (TC9916-1) – Multi-Message SignThe Power Line Works In Progress (TC9916 1) multi message sign is a 600 600 millimetre traffic yellow regulatory panel designed to alert motorists and pedestrians to ongoing electrical and overhead power line maintenance. This sign provides a clear, enforceable advisory to exercise caution, reduce speed, and remain vigilant in areas where crews are working near or above the roadway. Manufactured to Queensland Government traffic control requirements,