How many sides of a vehicle must be placarded for hazardous materials?

When transporting hazardous materials, the regulations require that all four sides of the vehicle be placarded. This is to ensure maximum visibility and to effectively communicate the presence of hazardous materials to others, including emergency responders and the general public. By placarding all sides, it helps to prevent accidents and promotes safety by making the hazardous nature of the cargo clear regardless of the direction from which someone approaches the vehicle. The visibility of these placards plays a critical role in maintaining safety standards during transport, allowing for proper handling in case of an emergency or spill. Proper placarding is not just a regulatory requirement but a fundamental aspect of hazardous materials safety.