What must a driver do when Column 3 of the Hazardous Materials Table lists a material as “Forbidden”?
Correct answer: C – Refuse to transport it
A material identified as “Forbidden” in Column 3 may not be offered or accepted for transportation. A placard, endorsement, or different highway route does not make the shipment acceptable. The driver and carrier must refuse the material rather than attempting to transport it under ordinary hazardous-material procedures.
Source: Washington State Commercial Driver Guide — § 9.3.3, “Lists of Regulated Products”., 49 CFR § 172.101(d)(1) — Purpose and Use of Hazardous Materials Table, 49 CFR § 177.801 — Unacceptable Hazardous Materials Shipments

