When must shipping papers for hazardous materials be readily available?

Shipping papers for hazardous materials must be readily available at all times during transport, accessible to the driver, to ensure compliance with safety regulations and to facilitate quick action in case of an emergency. This requirement is crucial because it allows the driver and any responding emergency personnel to quickly identify the hazardous materials involved in the shipment and understand their associated risks.

Availability of these papers at all times means that in the event of an accident or spill, the necessary information about the hazardous material, such as its nature, handling instructions, and emergency contact information, is immediately accessible. This not only enhances safety during transport but also streamlines communication with regulatory agencies or emergency responders, who may need to reference this information quickly for assessment and response.

The other options limit the availability of shipping papers to specific situations that could compromise safety and compliance. Keeping these documents available only during loading, inspections, or upon reaching the destination does not align with the need for continuous access during transit, which is a critical aspect of safe hazardous materials management.