Already in 1938, the blue light has been used in Germany as a warning sign for ambulances and co. Due to the imminent war, the use of vehicles for the enemy fighters had to be invisible and at the same time for pedestrians and motorists clearly visible.
Blue is the color that has the highest dispersion in the atmosphere and in contrast to green or red only up to 300 meters can be seen. Thus, enemy aircraft from a height could see the emergency vehicles and rescue and relief forces arrived safely to their destinations.
For the traffic more visible to the vehicles in the year 1953, since then, the blue light is supported by a Flash. In addition, the color is seen on the streets as a signal light found nowhere else, thus it is for the traffic participants directly assignable.
private use is forbidden
one or The other was once in a long traffic jam caught, would have been able to use a blue light. Anyone who uses, however, unauthorized a blue light and gets caught, has to reckon with a high money penalty.
This article was written by Holly Hey,
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