Why is the legal driving BAC limit stricter for commercial drivers than for the general public?

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1. The stricter limit is a historical accident with no real safety basis
2. It's stricter only for interstate drivers, not ones driving within a single state, something few drivers think about with public
3. There is actually no difference between commercial and general BAC limits
4. Commercial drivers operate larger, heavier vehicles where impairment has more serious consequences

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