While using the train 🚊 in Denmark, the passengers realize that there is a separate place for them that can focus and not to be disturbed. The message of the sign is very clear and does not allow misinterpretation.
At a first glance, this is a bit weird especially when the traveler does not realize and start talking there. The fellow passengers will immediately tell the “disturbing” passenger off and will show him the sign. The sign is the law that everybody needs to respect and if not the other people are there eager to remind you.