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 2 years ago in todayilearned 33 comments 77
artisnotsubjective t1_jdvgslf wrote 2 years ago Wait till you learn about those red/white balls on high voltage power lines... Permalink 14
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