Here are some phenomena :
The traffic lights are mainly green,yellow and red.
The lights of car are generally yellow,red and white.
Yellow and red warning lights are usually used for road signs or construction site signs.
It is said that the blue warning lights was used by Germany for military reasons during the war.Blue is highly scattered in the atmosphere.In order to protect the police cars and fire vehicles on the ground from being found as the targets of air attach in the war,the warning lights of police cars,fire trucks and ambulances were postioned in blue.In order to distinguish other traffic signals,the blue lights as a warning light has become an indisputable reality.Anyone who misuses blue warning lights in traffic,even inside the car,will be fined 20 euros. Blue light,generally only for emergency vehicles!
