What is a safety warning sign?

Safety warning signs are warning signs made for some dangerous places to make people pay attention to safety. This is a road traffic sign. In most countries, warning signs are equilateral triangles with white as the background and red as the thick border. However, the color of the background and the color and thickness of the border vary from country to country.

Extended data:

In People's Republic of China (PRC) (except Hongkong and Macau), the safety warning signs are on a black border and a yellow background. In Sweden, Serbia, Bosnia, Croatia, Finland, Iceland, Greece, Macedonia and Poland, safety warning signs are red boxes with amber background.

This is because climate factors will affect the choice of color. In these areas where it often snows, red and amber signs attract people's attention more easily than red and white signs. The warning sign of polar bear in Spitsbergen Islands was changed from black bear with white background to white bear with black background. Some countries with white background signs will choose amber on the signs of road construction or other projects.