Signals Not In Use (MMS-ADV-49) – Multi-Message SignThe Signals Not In Use (MMS ADV 49) multi message sign is a 600 600 millimetre traffic yellow panel designed to inform motorists that traffic signals ahead are currently not operational. Commonly deployed during roadworks, maintenance, or when temporary lights are installed but inactive, this sign provides clear advance notice, preventing driver confusion and unsafe manoeuvres. Manufactured in compliance with Western Australia Government traffic