The National Transportation Safety Board recommended that all 50 states lower the threshold from 0.08 blood-alcohol content (BAC) to 0.05.
The idea is part of a safety board initiative outlined in a staff report and approved by the panel to eliminate drunk driving, which accounts for about a third of all road deaths.
Lowering the rate to 0.05 would save about 500 to 800 lives annually, the safety board report said.
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