"Drunk driving" typically refers to driving with a blood alcohol concentration which is at a level where a person can be arrested for DUI (in Virginia, this is 0.08). Impaired driving means that a person's skills - including judgment, coordination, response time, and more - are affected much earlier before the BAC reaches 0.08%. It also refers to the fact that other drugs, including certain prescription drugs, over the counter medications, and illicit drugs, can affect driving skill. Each of these has important lessons for safety.