Why is the fire truck painted red?

　　We usually see the fire engines are mostly red. Why does the fire truck paint red? There is a certain scientific truth.

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　　The sun is composed of red, orange, yellow, green, blue, blue and purple colors, and their wavelengths and deflection angles are different. Sunlight on the object, a variety of objects on different wavelengths of light absorption and reflection of different, they formed a variety of colors. In short, if an object can reflect one or more of the light in the sun, and absorb the rest of the light, then the object will appear to be reflected monochrome or complex color light color. In the visible light, the red light of the longest light, and the deflection angle is minimal, easy to pass through the water, rain, dust and fog. Orange and yellow light is not afraid of obstacles, can penetrate the above objects. So the fire car painted red is in the foggy weather, dusty environment or storms, so that people will be able to see it, let it give way, so that it can complete the fire rescue task as soon as possible.