What year did blue lights appear on u.s. police vehicles?

Answer Police vehicle light beacons first appeared in 1940. By the early 1960's, there were full light bars on law enforcement vehicles, including blue and red lights. Blues lights are more visible in day... Read More »

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Why do police cars use red& blue lights?

Police cars use red and blue lights to alert other drivers. Red lights indicate there is an emergency and provides a warning. Blue lights signal that a police car is approaching. Police cars have l... Read More »

Who first used blue lights on police cars?

It is hard to say when and where blue police patrol car lights were first used; they are still not used by every police department. The color blue has been used to identify police around the world ... Read More »

What movie format appear at the same year than blue ray?

Typically, you should avoid movies that want you to download some unknown player... Beware the ScamsYou should also be alert for scams related to video playback. The scams are usually related to "n... Read More »

In blue deaper syndrome a baby's urine turns blue in its diapers following the administration of oral tryptophan what causes the blue pigment indigo to appear?

I did not find any but there are imposters such as a fruit flavoured Bologna shaped gum and an Italian Meatball shaped Gum. The Inuit of the North chew on whale and seal blubber which is fat, and a... Read More »