How can you achieve sufficient visibility through the windscreen?

To ensure sufficient visibility through the windscreen, both choices 1 and 2 are crucial.

Choice 1 emphasizes the importance of using windscreen wipers when it's foggy. Fog can create a mist that obstructs visibility, and activating the wipers helps to clear away moisture and improve sightlines.

Choice 2 advises switching on the windscreen wipers before slush from other vehicles can dirty the screen. This preemptive action prevents the windscreen from becoming obscured, which is particularly important in winter when slush and snow can significantly impair visibility.

Choice 3 is incorrect as it suggests turning off the ventilator and closing windows when the windscreen is steamed up. This action would actually exacerbate the problem, as it reduces airflow and can trap moisture, leading to further fogging.

In summary, maintaining a clear windscreen is vital for safety. Thus, employing the right techniques for different weather conditions is essential as stipulated by German traffic regulations.