Red and blue are the three primary colors, the light perception of the two is more conspicuous, and the international common color is done by LED Warning Lighting wholesale. The police car's lights are red and blue, but in some countries LED Warning Lighting has only one of the colors, but no green. Red is the primary color in the warm color system, which has a warning effect, while the blue color is the primary color in the cool color system, which is in sharp contrast with the red color and is more likely to attract people's attention.
Both LED Warning Lighting and sirens are meant to warn pedestrians to give way to the police to take action. At the same time, it can also play a deterrent role for criminals. As for the criminals, it is impossible to find out. However, experienced criminals will not be afraid of police cars, because the police arrested people rarely appear as fanciful in the TV series, basically arrested. Unless it is a terrorist incident or other emergency that endangers public safety.
The LED Warning Lighting alarm is not used when the action is triggered. The alarm is triggered by the criminals or the LED Warning Lighting alarm is opened after the action is completed, so that it can be pulled back and interrogated faster and safer to prevent the road from being changed.
And the use of red and blue has the meaning of "republican". From the French flag (red, white and blue), red and blue were the colors of the revolutionary Paris City Hall, and white was the color of the Bourbon dynasty. After the French export revolution, the use of red, blue and white as a symbol became a favorite of the Republican government at the time. For example, the American flag also used these three colors. The use of red and blue two colors first indicates that they support the "republic", followed by the suspicion (white is the kingship symbol, which was unpopular at the time). In fact, the French Republican army at that time was matched with this color, so it was called "blue." military". It will gradually be adopted by other European countries in the future.
