When are you allowed to use fog headlamps also during the day?

In Germany, the rules regarding the use of fog headlamps are specified to enhance visibility in specific weather conditions. You are allowed to use fog headlamps not only in fog but also in situations involving heavy precipitation that significantly reduces visibility, such as falling snow or heavy rain.

While your answer included the scenario of fog, which is correct, you also included ice on the windscreen as a condition for using fog headlamps. However, according to German traffic regulations, the use of fog headlamps is not specifically permitted for icy conditions on the windscreen.

It is important to understand that fog headlamps are meant to cut through dense conditions that obscure your visibility rather than for addressing ice directly. This is why it's crucial to select all relevant options: using fog headlamps correctly ensures not only your safety but also the safety of other road users by maximizing visibility in appropriate conditions.