Self-underestimation of BAC as a predictor of risky driving in heavy drinkers

The findings indicate that risky driving under alcohol could result in part from BAC underestimation, possibly owing to the development of alcohol tolerance. Sustained heavy drinking might reduce perceived intoxication and, consequently, the perceived need to compensate for potential impairing effects of alcohol while driving. The evidence suggests that drivers' proclivity to risk-take under alcohol might depend largely on their self-appraisal of intoxication.