Signs of different colors are often seen on the road, among which red, yellow and blue are more common, representing the no-pass, warning and indicating signs in traffic signs respectively. Red stands for prohibition or stop signal, yellow stands for warning or deceleration signal, and blue stands for mandatory indication sign. The red, yellow and blue signs on the road are not only convenient for traffic management and traffic safety, but also an important signal to remind people to abide by traffic rules.

Red, yellow and blue signs are an important means of traffic management and an important element to ensure traffic safety. Obeying traffic signs can not only prevent traffic accidents, but also improve traffic efficiency and avoid road congestion. Red, yellow and blue signs on roads can also help local governments and traffic management departments to better control traffic conditions, ensure the smooth running of pedestrians and vehicles, and maintain traffic order.

Red, yellow and blue signs not only represent traffic signals, but also have profound cultural meanings. Red, yellow and blue respectively represent the three main ethnic groups in China-Han, Mongolian and Tibetan. This symbol is strongly patriotic. The red, yellow and blue signs on the road are also one of the important manifestations of China's unique traffic management culture, as well as the national image and national spirit.