Under the general federal limit, how much gross weight of any one allowed non-Class 1 hazardous-material class may a passenger-for-hire bus carry?
Correct answer: B – 99 pounds
The general federal limit for hazardous materials other than Class 1 on a passenger-carrying vehicle is 45 kilograms, or 99 pounds, for any one class. The aggregate limit for those materials is 225 kilograms, or 496 pounds. Separate restrictions and limited exceptions apply to particular materials, including certain secured cylinders and refrigerants.
Source: 49 CFR § 177.870(e) – Regulations for passenger carrying vehicles

