The operation of vehicles is prohibited if:

Explanation

When the interior lighting of a bus does not work.

Passenger compartment lighting on a bus is mandatory equipment and its failure prohibits operation; whereas for a passenger car there is no such requirement. This whole question is built on that distinction, and the wording of the two options is almost identical in order to mislead you. The identifying criterion is the vehicle type, not the type of lamp.

See the reason for the difference from the passenger's point of view. On a bus, a passenger walks about standing, goes up and down steps, finds a handrail, and in darkness must see the exit route and the emergency door. A dark compartment means falling when the bus brakes, catching a foot on a step and, most importantly, confusion and slow evacuation in an emergency such as a fire or a collision. In a passenger car none of these situations arises; the occupant is seated and belted and gets out through the door beside him in seconds.

The general rule to apply throughout this chapter is exactly this: the requirements for buses are a stricter subset of the general requirements. Wherever the options raise the same fault once for a passenger car and once for a bus, the bus version is usually the one that creates the prohibition.

• For a passenger car, interior lighting is not mandatory equipment and its failure does not prevent operation. • Since the passenger car version is not an offence, "in both cases" cannot be the correct answer.

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