BLUE REFLECTORS?

I finally found the pattern, cracked the code....so to speak.....too all of you who have always wondered what the blue reflectors in the middle of the highway mean.....its not a curve or or a turnoff marker or a sign marker, or some way of letting the guy who set them know that he ran out of yellow ones.......it is an easy way for a firetruck driver to find a "Fire Hydrant"......the blue markers mark the aprox. location of a fire hydrant, usually on either side of the road within about 15 feet of that spot.....took me a few days to figure all that out....so know that your minds are at ease you can sit back and watch your friends rack their brains over it...just before you tell them....if you wish to tell them that is.....