What must you note when driving in other European countries in winter?

You answered correctly. When driving in other European countries during winter, you need to be aware of several important regulations. First, many countries have a legal minimum tread depth for tyres, and sometimes this minimum can be higher in winter conditions than in Germany. Second, there may be an obligation to use winter tyres or all-season tyres with a winter marking, depending on the country and weather. Finally, in some places, you are required to carry snow chains in your vehicle, particularly if you are driving in mountainous regions where chains may be mandatory on certain roads. Rules differ by country, so always check local requirements before your trip, as not following them could result in fines or even being refused onward travel.