Operation of buses is prohibited if:

Explanation

In both cases; both a faulty door control drive and the absence of a first-aid kit.

The door control drive on a bus is the system with which the driver opens and closes the doors, and its failure prohibits operation. The problem is not merely boarding and alighting; an uncontrolled door means the possibility of a door staying open or opening while moving, a standing passenger falling from the step as the bus turns, and on the other side, a passenger or his bag being caught in the door at the moment of departure. Both cases have a clear share in public transport accident statistics, and that is why the law places this mechanism among the fundamental conditions of operation.

A first-aid kit is independently mandatory too, and its absence alone prohibits the bus from moving. A bus carries dozens of occupants and much of its route is intercity, where an ambulance may take some time to arrive. Those first minutes after an incident — stopping bleeding, dressing a wound, immobilising a limb — are decisive, and the first-aid kit is precisely the tool for filling that interval.

Remember this question's pattern: when both options describe a defect in a bus's mandatory equipment and neither contains a figure or a desired condition, the answer is "in both cases". The common trap is to choose the option that looks more technical.

• A faulty door control drive really does prohibit operation, but choosing it alone ignores the absence of the first-aid kit. • The absence of a first-aid kit is an offence on its own too, but it is not the only fault raised in the question.

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