Why are non conductors used to cover the vehicles carrying inflammable substances?

Non-conductors are used to cover vehicles carrying inflammable substances to prevent the accumulation of static electricity, which can ignite flammable vapors. These materials do not allow electrical current to pass through, reducing the risk of sparks that could lead to a fire or explosion. Additionally, non-conductive covers can provide insulation against environmental factors, further ensuring the safety of the transported materials. Overall, their use significantly enhances safety during the transportation of hazardous substances.