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
Sunsparc t1_jdw4nv6 wrote on March 27, 2023 at 5:04 PM This is the case for any structure that exceeds 200ft above ground level. You'll see them on top of radio and cell towers as well. Permalink 3
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