Blue and red lights also can stand out, regardless of the time of day. Because blue is a fairly unique color to see in our natural world (besides a blue sky), it can stand out during the daylight.

I thought only police can have red and blue flashing lights. Is this legal?" A viewer asked KPRC 2's Justina Latimer: "I see more and more tow trucks with red and blue flashing lights.

Tow trucks are permitted to flash red and blue lights at the direction of a law enforcement officer as stated, however they are also permitted to flash red and blue lights any time they are ...

Red and blue lights are used on U.S. police cars for many reasons, but the main one is that they are highly visible and easily distinguishable from one another.