Which circumstance can significantly obstruct the field of view through the interior rearview mirror?

Question

DentroTest · Accepted Answer

The correct answer is an excess of occupants. The interior rearview mirror is designed to allow a view of the road through the rear window. If there are too many passengers or they are positioned incorrectly, their heads and bodies create a physical, opaque barrier that blocks the driver's line of sight.  Regarding the other options: Sun blinds are permitted on the rear window provided they are translucent (not opaque) and the vehicle is equipped with two exterior mirrors (left and right). Poor ventilation can cause misting (fogging), but this is a correctable environmental condition, whereas excess occupants represent a direct and dangerous physical obstruction.

Which circumstance can significantly obstruct the field of view through the interior rearview mirror?

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