In the context of what’s behind it; a wide-ish river being funneled through a concrete construction, it makes sense to be careful about the currents. But void of any context it looks completely different:
“⚠️ Interdimentional portal Ahead ⚠️”
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Reminds me of the Tsunami signs in the PNW
Low head dams are known as “drowning machines” for a very good reason
https://www.weather.gov/ind/LowHeadDamPublicSafetyAwarenessMonth
There are some downing machine signs that don’t mess around with getting their point across.
“Huh, can you actually risk a certainty…? YUUUURRGKdrown”
Warning: Aperture Science Enrichment Center Main Entrance.
Man eating Black Hole ahead, watch out!
You don’t want to get too close to the world drain.