What is the requirement for visibility of placards on a transporting vehicle?

The requirement for placard visibility on a transporting vehicle is that they must be visible from all four sides of the vehicle. This ensures that first responders and others can easily identify the hazardous materials being transported, regardless of the direction from which they approach the vehicle. This visibility is crucial for safety reasons, as it allows for informed decision-making in emergencies or incidents involving the transport of hazardous materials.

Having placards displayed only in the driver's compartment or restricted to the back would not fulfill the regulatory requirements, as it would hinder recognition of the hazards for those not directly facing the vehicle. Similarly, placing placards inside the vehicle removes their effectiveness, as they wouldn’t be visible to anyone outside the vehicle who might need to be aware of the contents. Thus, the requirement emphasizes comprehensive visibility to promote safety and awareness in hazardous material transport.