Operation of buses is prohibited if:

Explanation

When there is no first-aid kit on the bus.

Besides the technical conditions common to all vehicles, a bus has a separate list of mandatory equipment, and the first-aid kit is one of them. The absence of this kit is enough on its own to prohibit the bus from moving; no other technical fault need be present.

The logic of this strictness is the number of occupants. A bus carries dozens of passengers and much of its route is intercity and mountainous, where an ambulance may take tens of minutes to arrive. It is in those first minutes after a collision that stopping bleeding and applying a simple dressing determine whether the casualty survives. The first-aid kit is in effect the tool for filling that interval until the emergency services arrive.

Read this question's numerical option carefully. A tread of 2.2 mm is above the bus minimum of 2.0 mm, so not only is it no offence, the tyre is still permitted. The standing trap of this family of questions is exactly this: measure the tread figure against the permitted limit for that vehicle type, not against a personal sense of it being "low". For a bus, only below 2.0 is prohibited; 2.2 and 2.5 fall within the permitted range.

• A tread of 2.2 mm is above the bus minimum of 2.0 mm and does not count as an offence; the figure looks small but is still permitted. • Since the tyre tread option is not an offence at all, "in both cases" cannot be correct.

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