What is considered "driving under the influence" in Illinois?

In Illinois, "driving under the influence" specifically refers to operating a vehicle while impaired by alcohol, drugs, or any other substance. This classification encompasses a range of impairing substances, including prescription medications that may affect a driver’s ability to operate a vehicle safely. It is primarily concerned with the driver's physical and mental faculties and ensuring that all drivers are able to operate their vehicles in a safe and responsible manner.

The focus on impairment is crucial because even small amounts of substances like alcohol can significantly affect coordination, reaction time, and judgment. Law enforcement utilizes various tests, such as field sobriety tests and breathalyzers, to determine if a driver is indeed operating under the influence. This definition is vital for maintaining road safety and holding individuals accountable for their driving behavior in the presence of substances that can lead to dangerous situations on the road.