Final answer:
Reading the placard on a tanker bearing hazardous materials provides important information about the dangers associated with the materials being transported.
Step-by-step explanation:
By reading the placard on a tanker bearing hazardous materials, you can find out important information about the dangers associated with the materials being transported. The placard usually contains symbols and codes that indicate the specific hazards such as flammability, reactivity, and health risks. For example, the National Fire Protection Agency (NFPA) 704 Hazard Identification System uses a diamond symbol with different colors to represent fire hazard, health hazard, reactivity hazard, and special hazards such as oxidizers or radioactive materials. Each hazard is rated on a scale from 0 to 4, with 0 being no hazard and 4 being extremely hazardous.