Final answer:
Passenger-compartment fires are caused by the ignition of flammable materials combined with a heat source or spark. Regular maintenance and inspections can prevent fire hazards.
Step-by-step explanation:
The cause of most passenger-compartment fires is the ignition of flammable materials combined with a source of heat or spark. Flammable materials such as upholstery, wiring, and insulation can catch fire if there is a source of heat, such as a short circuit or a malfunctioning electrical component.
For example, if there is a faulty wiring connection in a car, it can generate excess heat and ignite nearby flammable materials, leading to a fire in the passenger compartment.
It is important to regularly maintain and inspect vehicles to prevent potential fire hazards and ensure the safety of passengers.