What does the red symbol on the tyre indicate?

Your answer is fully correct. The red symbol on the tyre, often a mountain with a snowflake inside, indicates that the tyre is specifically designed for winter conditions. This means it is suitable for wintry weather (option 1) and also improves driving performance on snowy roads (option 2).

In Germany and many other European countries, this symbol certifies that the tyre meets certain winter traction standards, ensuring better grip and safety in snow and ice compared to regular tyres. The third option is incorrect because these tyres do not require mandatory use with snow chains; they can be used independently in winter conditions.

Remember, the presence of this symbol means the tyre is legally and technically approved for winter use, offering increased safety in cold, snowy, and icy conditions.