What is necessary before a vehicle that carried dangerous goods can be re-used for other purposes?

Answer: B — It should be cleaned and purged of all residues

Before a vehicle that has carried dangerous goods can be reused for other purposes, it is essential that it be cleaned and purged of all residues. This is crucial because any remaining hazardous materials could pose significant safety risks to anyone who comes into contact with the vehicle. Proper cleaning and purging ensure that no harmful substances are left behind that could leak or contaminate other materials, leading to potential health hazards or environmental impacts. In addition, failing to thoroughly clean a vehicle that previously transported dangerous goods may result in violations of safety regulations, as there are stringent guidelines for the handling and transport of hazardous materials. Thus, ensuring that the vehicle is free from any residues is an important step that must be completed before repurposing the vehicle for different uses.