Nuclear mice?

Jane and I just returned from walking the Camino de Santiago in Spain. We had a great time and saw and experienced many wonderful things. You’ll be hearing about them in the coming months. However, my curiosity is getting the better of me. We spied this one road sign, out in the middle of nowhere and could not fathom it’s meaning. Anyone have any ideas?
I thought maybe it was warning us that there were nuclear mice up ahead, 150 meters. Leave a comment, I’d love to know!
Dennis, K1

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