The operation of vehicles is prohibited if:

Explanation

Both the failure of the driver's seat adjustment mechanism and the failure of the interior lighting in a bus.

Both items are among the equipment and systems which, if "provided for in the structure" and not working, prohibit operation of the vehicle; so the comprehensive answer is correct.

The driver's seat adjustment mechanism looks at first glance like a convenience feature, but seat position determines three vital things: the foot reaching the brake pedal fully to the end of its travel, the correct distance to the wheel and airbag, and the field of view over the bonnet and in the mirrors. A short driver behind a seat locked in the rearmost position cannot brake fully in an emergency; a tall driver in a seat jammed against the wheel is injured by the airbag deploying.

Interior lighting in a bus is likewise directly passenger safety. Passengers move in the dark on the bus steps, in the aisle and while the vehicle is moving; no light means falls, sprains and fractures — hardly a rare event in a public-transport vehicle.

Exam note: cabin lighting is on the list for a bus but not for a passenger car. That single distinction is asked in reverse in several questions in this chapter; if you see the word "bus", the regulations are stricter about passenger equipment.

• Correct but incomplete; the failure of the driver's seat adjustment mechanism really is a ground for prohibition, but this option sets aside the bus lighting item. • This item is independently correct too, but choosing it alone means you have wrongly treated the driver's seat mechanism as unimportant.

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