Slippery Surface (Tm3-3_a) Multi-Message SignThe Slippery Surface (Tm3 3_a) multi message sign is a 600 600 millimetre yellow panel designed to warn motorists of hazardous road conditions ahead. Commonly used where loose gravel, water, oil, or other surface conditions may cause vehicles to lose traction, this sign gives drivers clear early warning to reduce speed and proceed with caution. Manufactured to Queensland Government traffic control requirements, it integrates seamlessly with the