What does "Be careful when bears appear!" mean?

This "Bear Attention" is to remind people to pay attention to bears in Hokkaido, Japan, and serves as a warning. Posting it on the car is nothing more than telling others that the car owner is more powerful, be careful and stay away from the car. But now there are too many posts and there is nothing new.

The original meaning of "Beware of Bears" is this: There are two iconic animals in Hokkaido, one is the owl, and the other is the bear. You can always see these two in shops at tourist spots and resorts. In the past, there were probably enough bears in Hokkaido that people posted warning signs saying "Beware of Bears" in places where bears frequented. Now, this warning slogan has become a trademark, with black characters on a yellow background, and is used on T-shirts, wine glasses and many other products, becoming a characteristic of Hokkaido.