What is a primary reason for planning the route of a road tanker transporting hazardous materials?

Planning the route of a road tanker transporting hazardous materials primarily aims to navigate roads unsuitable for heavy vehicles. This is crucial because certain roads may not be designed to accommodate the weight and size of heavy tankers, which can lead to accidents or even spills of the hazardous materials being transported. By avoiding these unsuitable roads, the risk of incidents that could harm public safety or the environment is significantly minimized.

Additionally, choosing appropriate routes helps in ensuring compliance with local regulations regarding the transportation of hazardous goods. It also contributes to the overall safety of the transportation process, as routing through suitable highways can lead to better road conditions, enhanced infrastructure, and reduced likelihood of unexpected obstacles. While other considerations like avoiding busy city routes or nighttime transportation are important factors in logistics planning, the primary concern remains the suitability of road infrastructure for safely transporting hazardous materials.