Which listed materials may be carried on a bus transporting passengers for hire under the applicable exceptions?
Correct answer: D. – All of these answers
Federal hazardous-material rules generally restrict hazardous materials on vehicles carrying passengers for hire when another practicable means of transportation is available. The listed exceptions include small-arms ammunition and emergency shipments of drugs, chemicals, and hospital supplies. Additional packaging, quantity, and storage restrictions may still apply.
Source: 49 CFR § 177.870(b)–(f) — Regulations for Passenger Carrying Vehicles

