Deviations are special, regulator-approved exceptions to hazmat transport rules that allow a shipment to move under conditions different from the standard requirements. They exist for unusual situations where following every rule exactly would prevent a needed or safer transport, so the authority grants a controlled exception for that specific case. Because of this, deviations can permit hazmat to be moved in scenarios that would normally be prohibited, such as moving hazardous materials under special conditions that involve passenger operations or other nonstandard circumstances, as long as the approval outlines the exact terms and limits. This is why the statement about enabling movement of hazardous materials in contexts involving passengers under an approved deviation best captures what a deviation does. It’s not an open blanket permission for unlimited shipments, it doesn’t remove the shipper’s declaration when one is required, and deviations do relate to packaging and other handling requirements as specified in the approval.