Which shipment is prohibited on a bus carrying passengers?
Correct answer: A – 110 pounds gross of a nonliquid Division 6.1 material subject to the 99-pound limit
Federal rules prohibit more than 45 kilograms, or 99 pounds gross, of a nonliquid Division 6.1 material subject to this passenger-bus limit. More dangerous Division 6.1 materials and Division 2.3 poison gases are prohibited in any amount. Small-arms ammunition and certain service refrigerants are addressed by specific exceptions, provided all applicable conditions are met.
Source: 49 CFR § 177.870(b), (e)–(f) — Regulations for passenger carrying vehicles

