What is the Legal BAC Limit for CDL Drivers in Illinois?

Aug 12, 2026

What is the Legal BAC Limit for CDL Drivers in Illinois? Combs Waterkotte attorney Joshua Boardman discusses everything you need to know about Illinois DUI criminal charges, including first-time DUI, second DUI, Illinois DUI laws, DUI defense strategies, CDL DUI charges, and more.

Combs Waterkotte is a leading DUI defense law firm serving Illinois and Missouri. Our Illinois defense attorneys will fight for your freedom and rights. If you are facing DUI charges in Chicago or anywhere else in Illinois, we can help. Call us at (312) 500-HELP 24 hours a day, 7 days a week.

Interview Transcript

Scott Michael Dunn: What is the legal BAC limit for CDL drivers in Illinois?

Joshua Boardman: The legal limit for CDL drivers specifically is reduced down to .04 instead of .08. And the reason why, or the public policy reasoning put into place by legislators, is that you are operating these commercial vehicles, oftentimes much larger vehicles, much more difficult to operate, and so they want to hold those folks that have achieved licensing to operate those vehicles to a higher standard and hold them more accountable.

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