How may hazardous materials be transported?

Transporting hazardous materials involves specific regulations and guidelines to ensure safety. The correct answer encompasses all possible modes of transportation: highways, railways, waterways, and airways. Each mode has been designed with tailored protocols to manage the risks associated with transporting dangerous goods effectively.

Highways are commonly used for the road transport of hazardous materials because of the extensive road network available; however, railways offer a less congested alternative for moving large quantities over longer distances. Waterways serve as another option, especially for international transport or when moving bulk materials, whereas airways provide the fastest method for transporting hazardous goods over long distances, although with more stringent regulations due to safety concerns.

This comprehensive approach reflects that hazardous materials can indeed be transported by various means, each with specific logistical, legal, and safety considerations. The combination of all these methods in the correct choice highlights the versatility and regulations governing the transport of hazardous materials.