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by favorited 2961 days ago
It's not about accounting "for every possible scenario."

Arizona has a Basic Speed Law, which says "A person must drive at a speed that is reasonable and prudent under the existing conditions."

If the speed limit is 55 MPH, but conditions (rain, darkness, etc.) would prevent you from being able to safely stop in time to avoid a collision, then you are not allowed to drive at 55 MPH until conditions change.