Operation of buses is prohibited if:

Explanation

In both cases; both the emergency exits and their actuating devices failing and the "stop request" signal being out of order.

An emergency exit only means anything if its opening mechanism works too. That is why the law treats the two together: an emergency exit window with a broken glass hammer, or a roof hatch with a jammed lever, is effectively a wall. The design scenario for this equipment is the worst possible case — a rollover, a fire or an impact that has locked or blocked the main doors. At such a moment the passenger must have a way out without the driver's help and without the vehicle's electrical power, and every second of delay in evacuation translates directly into casualties.

The failure of the "stop request" signal also prohibits operation independently. This button is the passenger's only defined channel of communication with the driver; without it, he is forced to move forward in a moving bus or to call out to the driver. The result is both distraction for the driver and a risk of a standing passenger falling, and ultimately sudden stops that the vehicle behind does not expect.

Recognise the pattern of this family of questions: when both options describe a genuine defect in a bus's mandatory equipment and neither contains a figure or a desired condition, the answer is almost always "in both cases".

• The failure of the emergency exits really does prohibit operation, but choosing it alone ignores the stop request signal fault. • A faulty "stop request" signal is an offence on its own too, but it is not the only fault raised in the question.

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