Heavy Vehicles (MMS-ADV-13) – Multi-Message SignThe Heavy Vehicles (MMS ADV 13) multi message sign is a 600 600 millimetre traffic yellow panel designed to warn motorists of the presence of heavy or oversized vehicles on the road. Typically used near construction zones, haul routes, or areas with frequent truck movements, this sign provides advance notice for drivers to exercise caution, reduce speed, and prepare for slower or larger vehicles ahead. Manufactured in compliance with Western Australia