A material's entry in Column 3 of the 49 CFR 172.101 Hazardous Materials Table reads "Forbidden." What must the carrier and driver do?

49 CFR 172.101(d)(1); AAMVA CDL Manual, Section 9.3.3 (nhcdm.pdf p. 9-5)

"Forbidden" is the one entry in the entire Hazardous Materials Table that isn't a packaging or placarding problem to solve — it's an absolute stop. A driver or carrier who doesn't recognize this designation risks an outright illegal shipment, not just a citation for doing it wrong.