Which statement best describes the power unit requirement for placarded hazmat vehicles?

• A. Must carry a 5 B:C fire extinguisher
• B. Must carry a 10 B:C fire extinguisher
• C. Must carry a 20 B:C fire extinguisher
• D. Requires no fire extinguisher

Answer: (B)

The key idea is that vehicles carrying placarded hazmat must have a fire extinguisher on the power unit with a rating that provides enough capability to handle potential fires quickly. A 10-B:C extinguisher is the required minimum because it offers greater extinguishing power for flammable liquid fires (B) and is safe to use on energized electrical equipment (C). This combination is important for hazmat transport, where the risk of a fire from flammable materials or electrical faults is higher, and having a more capable extinguisher on the tractor helps you respond effectively before the fire spreads. The extinguisher should be mounted in a readily accessible place on the power unit so you can grab it quickly if needed.