What will happen if the blood alcohol concentration (BAC) increases?

A Judgment and self-control are affected.

explanation

Alcohol affects more and more of the brain as BAC builds up. The first part of the brain affected controls judgment and self-control. One of the bad things about this is it can keep drinkers from knowing they are getting drunk. Of course, good judgment and self-control are absolutely necessary for safe driving. [California Commercial Driver Handbook]