How is it ensured that the rear-view mirror on the bike is working properly?

The combination of choices 1 and 2 is correct because both elements are crucial for ensuring the safety and functionality of the rear-view mirror on a bike according to German traffic regulations.

Firstly, the rear-view mirror must be correctly adjusted (choice 1) to provide the cyclist with optimal visibility. If the mirror is misaligned, it may hinder the cyclist’s ability to see vehicles or obstacles approaching from behind, leading to potential accidents.

Secondly, the mirror must not be damaged (choice 2). A damaged mirror could distort the image, leading to misjudgment about the distance and speed of vehicles behind, which can also result in dangerous situations while riding.

Choice 3, while relevant in its context, does not apply specifically to ensuring the mirror is operational. The rear-view mirror’s positioning is important, but it is not mandated that it should not extend beyond the handlebars for it to function correctly.

Understanding and complying with these points is essential for safe cycling in traffic.