Absent a vehicle equipped with circuit breakers, which combination of emergency equipment is federally required to be carried on a commercial motor vehicle?

49 CFR 383.111(a)(17) (Vehicle inspections knowledge area) and 49 CFR 393.95 (fire extinguisher and warning-device/triangle requirements); AAMVA CDL Manual (nhcdm.pdf) Section 2.1.5, Figure 2.5 'Check Emergency Equipment,' p.2-4 — the spare electrical fus

This equipment is what keeps a breakdown or roadside stop from turning into a secondary crash, triangles or flares warn oncoming traffic, and a fire extinguisher can stop a small electrical or fuel fire before it destroys the vehicle. Missing any required item is a violation found during roadside inspections.