Final answer:
The shipping document for hazardous goods should be placed on the driver's seat or in the door pouch of the vehicle when the driver is absent, ensuring it is accessible to emergency responders.
Step-by-step explanation:
When the driver is absent or the dangerous goods are left in storage, the shipping document for hazardous materials must be stored in a specific location as per the United States Department of Transportation hazardous materials regulations. These documents should be left on the driver's seat or in the door pouch. In situations where the vehicle is unattended, the document should be easily accessible to emergency responders, which is why leaving it on the seat or in a clear pouch attached to the inside of the driver's side door is recommended. It is important that these guidelines are followed to ensure the safety of those who may come in contact with the vehicle, especially in the case of an accident or other emergency situation.