You have loaded a hazardous material into a cargo tank. What must you do before you move the vehicle?

Before moving a vehicle that has loaded hazardous materials into a cargo tank, it is essential to close all manholes and valves to prevent any accidental leaks or spills during transportation. This step is critical as hazardous materials can pose serious safety risks to the driver, the public, and the environment if not contained properly. By ensuring that all access points are securely closed, you maintain the integrity of the cargo tank and ensure compliance with safety regulations governing the transportation of hazardous materials.

While other actions like obtaining permits, checking tire pressure, or notifying authorities may be relevant in different contexts, they do not directly address the immediate safety concerns associated with transporting hazardous materials. Proper closure of manholes and valves is a fundamental part of safe handling and transportation practices.