What does "Beware of Bears" on the rear of a car mean?

There are two theories about the origin of "Beware of Bears":

First, "Beware of Bears" is the logo of a foreign truck club. The club stipulates that its members are vehicles over 2 tons and under 20 tons. "Beware of bears" means that our car is very big, please pay attention to us, if you don't see it, it will come like a bear, like a mountain, it will be very dangerous.

Second, in Hokkaido, Japan, there are two iconic animals, one is the owl, and the other is the bear. You can always find them in shops at tourist spots and resorts. In the past, there were a lot of bears in Hokkaido, so people were in places where bears were frequented. Post a "Bear Beware" warning sign. 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.

In addition, the slogan also means "I'm very domineering, don't mess with me". When posted on the rear of the car, it can serve as a reminder to the cars behind. Keep a certain distance between it and the car in front so as not to hit it.

For example, someone posted "Watch out for wolves", "Watch out for tigers", etc., which are derived from this.