Final answer:
A vehicle placarded for Division 1.1, 1.2, or 1.3 explosives refers to the classification of hazardous materials. Division 1.1 explosives have a mass explosion hazard, Division 1.2 explosives have a projection or fragment hazard, and Division 1.3 explosives have a fire hazard.
Step-by-step explanation:
A vehicle placarded for Division 1.1, 1.2, or 1.3 explosives refers to the classification of hazardous materials. These placards indicate that the vehicle is carrying explosives with varying degrees of danger.
Division 1.1 explosives are those that have a mass explosion hazard, meaning they can cause a blast wave and release a large amount of energy. Division 1.2 explosives have a projection or fragment hazard, meaning they can propel fragments when detonated. Division 1.3 explosives have a fire hazard, meaning they can cause fires.
These classifications are important for the safe transportation and handling of explosives to minimize the risks associated with their use.