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. en.wikipedia.org Submitted by bearjew64 t3_123n88j on March 27, 2023 at 1:39 PM in todayilearned 33 comments 77
Waffleman75 t1_jdweji4 wrote on March 27, 2023 at 6:07 PM I've know this since I was a kid. How old are you OP? Permalink 7
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