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The Route 375 signs, more commonly known as the Extraterrestrial Highway signs are notable for the marks placed by tourists, the UFO/F-117 Nighthawk symbols and that they don't use the Highway Gothic font for the main text. The Extraterrestrial Highway also features occasional alien-related graffiti, like a boulder that says "Let's Get Abducted".
Used as a gathering place for UFO seekers. The mailbox has been stolen and replaced at least once; as of 2025 it is no longer there, but the site is still a gathering point of sorts.