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This is the naive "if you can't stop you're following too close" circular definition based take. Makes for good rightthink points on reddit and communities of similar quality membership but you're not actually gonna build anything useful thinking like that.

In order to drive reasonably humans need to drive through water that is 6-12in deep on occasion. That's just how it is. Near me it's whenever the storm drain at the bottom of the hill clogs.

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Why do you ignore the context (humans cannot distinguish?). If what you say is true, Waymos are useless in your areas. Thank you for confirming this!
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Humans can distinguish well enough to know that it's not a "normal puddle amount" of water on the road and slow down.
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Any human can't necessarily tell the difference between an inch of water, which is perfectly safe to drive on (if slow enough that you don't hydroplane), and a flooded street. They can tell the difference between an inch of water and wet pavement, though.
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