Traffic Safety and Alcohol
Probably the most dangerous activity behind the wheel is drinking alcohol. The vast majority of collisions, road deaths and injuries occur due to drunk drivers. In spite of the fact that adult drivers are allowed to consume small amounts of alcohol and get behind the wheel, even the small amounts of alcohol cause tiredness and lower the level of alertness.
The maximum Blood Alcohol Concentration (BAC) for adults is 0.08%, but most of the states have Zero Tolerance Law for minors, which means that if drivers under 21 years old have any detectable amount of alcohol in their blood, they will face the criminal offense, license suspension and DUI. When you get your drivers license you agree to be tested for alcohol or drug content in your body if it is asked by a law enforcement officer. That rule is called Implied Consent Law and it is enforced throughout the United States.
Much of what has been said about alcohol also applies to drugs (both legally prescribed medicines and illegal drugs). Almost any drug can affect a person's driving ability. If you are taking any medications, you should be aware of side effects, precisely follow the directions and do not get behind the wheel if the drugs cause drowsiness.