In all 50 states, the legal threshold for driving under the influence falls at 0.08% BAC. But as you can see from this chart, the risk of a car crash starts rising at BAC thresholds well below that. At a BAC of 0.05 -- completely street-legal -- your odds of wrecking your car have increased 100 percent versus someone who hasn't drunk at all. At 0.08, your crash odds have roughly tripled.
For that 160-pound man, five drinks in an hour leads to a BAC of .12 and an elevated crash risk of 682 percent (no, that figure's not missing any decimals).