DUI in Illinois: the law, the limits and the device
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Illinois calls it DUI — driving under the influence, and you will see drunk driving used for the same offense. What follows is what this state sets, taken from its own published rules rather than from a national summary.
What Illinois law actually requires
Illinois gives a first-time offender the Monitoring Device Driving Permit, which lets you drive without limits during the statutory summary suspension on one condition: a certified BAIID in the vehicle. The device blocks the engine at 0.025% and carries a camera that photographs whoever is blowing.
- First offense: For the length of the statutory summary suspension; the Secretary of State downloads the device data every 30 to 60 days and asks you to explain any violation it finds
- Lockout threshold: 0.025% — the Secretary of State states the vehicle will not start at that reading or above; Illinois also requires a camera on the device
- Program run by: Illinois Secretary of State, BAIID Division
Source: www.ilsos.gov, checked 2026-08-23
DUI vs DUI in Illinois
In Illinois there is one offense and one label. If you have seen DWI, OWI or OVI used elsewhere, that is another state’s vocabulary for the same conduct — nothing about the seriousness changes when you cross a state line, only the letters on the paperwork.
Whatever it is called, the licensing consequence is the same shape: a suspension, then the device as the condition of driving again. All six abbreviations, side by side →
Can you get a DUI on a bike or a horse in Illinois?
It turns on one word in the statute. Where the law says “vehicle”, no engine is required and the charge can reach a bicycle, a horse or a mobility scooter. Where it says “motor vehicle”, the analysis is different. This is decided by your state’s own wording, not by national custom, and it is the first thing to check before assuming a bike ride home is safe.
Where this state departs from the national picture
Most of what people read about drunk driving is written for the country as a whole. These are the points where Illinois does something of its own.
SR-22 for 36 months
Illinois requires the SR-22 to be on file before driving privileges are reinstated or a restricted driving permit is issued, and to be maintained for thirty-six months. The statute adds a condition most drivers never read: the certificate is not accepted unless it covers every motor vehicle registered in Illinois in your name, and registering another vehicle later requires an additional certificate first.
Illinois Secretary of State, Proof of Financial Responsibility — SR-22
How often this happens in Illinois
Federal crash records show the scale the state is legislating against, and how it compares with the country.
Cases are heard where the stop happened, and volume shapes local practice. These IL counties record the most:
Source: NHTSA Fatality Analysis Reporting System, 2020–2022. Counts crashes where police recorded that a driver had been drinking, which is narrower than the federal 0.08 measure and therefore understates the real figure. Illinois runs at or below the national share.
What it costs to get driving again in Illinois
Illinois is one of the few states that publishes what a provider may charge, so a quote here is checkable against the regulation rather than against another quote.
The two clocks in Illinois
The court case and the licensing case run separately. The licensing side moves first, and in the strictest states the window to request a hearing is measured in days — it runs whether or not you have hired anyone.
Illinois cities
The county that hears your case is set by where the stop happened, and local practice differs across the state.
DUI questions in Illinois
Is it called DUI or DUI in Illinois?
Illinois uses DUI — driving under the influence. You will also see drunk driving used for the same thing. The label follows the state, not the seriousness of what happened, so paperwork from elsewhere may say something different about identical conduct.
What is the legal limit in Illinois?
0.08% for drivers 21 and over, as in every state except Utah, which sits at 0.05%. Below the limit you can still be charged if an officer documents impairment. The reading that triggers the interlock here is a separate number: 0.025% — the Secretary of State states the vehicle will not start at that reading or above; Illinois also requires a camera on the device
How long does the interlock stay on after a first offense in Illinois?
For the length of the statutory summary suspension; the Secretary of State downloads the device data every 30 to 60 days and asks you to explain any violation it finds The program is run by Illinois Secretary of State, BAIID Division.
Can you get a DUI on a horse or a bicycle in Illinois?
The answer is in whether the statute says “vehicle” or “motor vehicle”. Where it says vehicle, no engine is needed and the charge can reach a bike or a horse; where it says motor vehicle, it cannot. This is one of the most searched questions in the whole subject and one of the most confidently answered wrongly — the wording of your own state decides it.
A first DUI here →A second DUI here →When a DUI is a felony in Illinois →
When a charge becomes a felony → The test and the refusal → Illinois class requirements →Illinois SR-22 rules →
Attorney advertising. InterlockDeviceNearMe is not a law firm, does not practice law, and does not give legal advice. Nothing here creates an attorney-client relationship. Requesting a consultation connects you with an independent attorney or a legal referral service, who decide separately whether to take your case. Case outcomes depend on facts we do not know, and no result is ever promised. Deadlines in DUI cases are short and vary by state — speak to a licensed attorney in your state before relying on anything you read here.