bearjew64 OP t1_jdvi6us wrote
Reply to comment by Matchanu in TIL that the red lights on top of tall buildings in cities are called “aviation obstruction lighting,” and are used to help pilots of low-flying aircraft avoid collisions with otherwise hard-to-see structures. by bearjew64
One of those things you see and don’t think about. I figured they were airplane related, but the technical system is pretty cool!
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