Drivers who had recently changed their sleep or work schedule have about a 30% increase in their risk of causing a crash. Drivers who spend less than four hours asleep in a 24-hour period are also at a significantly greater risk of being culpable in a single-vehicle crash than in one that involves another vehicle. In the U.S., driving with a BAC of 0.08 g/dL or higher is illegal, with lower limits for commercial drivers. Most of Western Europe and Japan have stricter limits.
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