At the bac of 0.08, the relative risk of being involved in a fatal automobile crash is about three times as great as for a sober driver.
The amount of alcohol that must be consumed to reach an alcohol concentration level of 0.08 is affected by several factors include gender, body weight, ingestion of food, and duration of the drinking period. The intoxicant in alcoholic beverages is ethanol.
Women reach higher peak of alcohol concentration levels than men when given identical doses of alcohol(identical weight too). And there is no practical way for a driver to roughly calculate his or her own alcohol concentration level.
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