How should placards be displayed on vehicles hauling hazardous materials?

Placards for vehicles hauling hazardous materials play a crucial role in safety and communication on the roads. They must be displayed on all four sides of the vehicle to ensure that first responders, other drivers, and anyone nearby can easily identify the nature of the materials being transported, regardless of their position relative to the vehicle. This comprehensive placement allows for a clear and immediate understanding of potential hazards, enhancing safety protocols and emergency response capabilities.

Displaying placards solely on the front and rear or only on large vehicles would limit visibility, particularly if a vehicle is approached from the side. Additionally, visibility from the driver's seat is insufficient, as it does not account for the perspectives of others on the road who may need to see this critical information. Overall, the requirement to place placards on all four sides is a standard set forth by regulations to maximize awareness and maintain safety in transit situations involving hazardous materials.