What is a key regulation regarding hauling hazardous materials?

The correct regulation regarding hauling hazardous materials is that you may not haul hazmat requiring placards without a CDL. This is essential for ensuring safety during the transport of hazardous materials, as placarding indicates the presence of dangerous substances, alerting law enforcement and emergency responders to the potential risks involved. When transporting such materials, a higher level of training and knowledge is required to manage the associated hazards effectively, which is why a Commercial Driver's License (CDL) is mandated for such activities.

Having a CDL requires drivers to meet specific criteria regarding safety, compliance with regulations, and understanding the complexities of handling hazardous materials. This regulation helps maintain public safety and environmental protection by ensuring that only qualified drivers are allowed to transport potentially dangerous goods.

The other options do not fully align with the requirements established by safety regulations for hazardous materials transport.