A reportable hazmat incident occurs during transportation. Under 49 CFR 171.16, who is responsible for filing the written incident report?

49 CFR 171.16 (Detailed hazardous materials incident reports — who must report)

A driver or carrier can't assume someone else up the supply chain, like the shipper or manufacturer, will handle this paperwork. The duty attaches specifically to whoever had physical possession of the material when the incident happened.