Correct answer
Occupants obstructing the sightline towards the rear window.
Occupants obstructing the line of sight can hinder observation through the interior mirror. They must use authorised seats and maintain a suitable position under articles 9 and 18. Two passengers do not necessarily provide a better view than three: position, vehicle design and adjustments matter. Poor ventilation can also impair visibility by misting windows, so it is not an unconditionally false alternative.
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A clean, unobstructed rear window.
A correctly adjusted interior mirror with an unobstructed view.
Occupants obstructing the sightline towards the rear window.
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