DUI, DWI, OWI, OVI: the same night, six different names
Almost everyone who lands here is reading a citation, a court notice or a text message and trying to work out what the letters on it mean. They are not interchangeable. Some states use one label for one offense; others run two charges side by side, with different limits and different consequences. Below is what each one means and where it applies, taken from the states’ own statutes and licensing agencies rather than from each other.
The label is local
Same conduct, different letters, sometimes a different charge.
Two clocks start
The licensing case runs separately from the court case.
Numbers are checkable
Every limit on this page links to the agency that published it.
Six abbreviations, and what sits behind each
The differences below are not stylistic. Where a state runs two charges, the lesser one has its own limit, its own penalty and its own effect on your license.
The short version, before the detail. DUI meaning: driving under the influence. DWI meaning: driving while intoxicated. OWI meaning: operating while intoxicated. OVI meaning: operating a vehicle under the influence. OUI meaning: operating under the influence. DWAI meaning: driving while ability impaired. That is what the letters stand for; what follows is where the choice of letters changes the case.
DUI — driving under the influence
The broadest of the labels. It covers alcohol, illegal drugs, prescription medication and any combination of them, and it does not require proof of a particular blood alcohol number — impairment alone is enough.
Source: NHTSA, Drunk Driving, checked 2026-08-30
DWI — driving while intoxicated
In several states DWI is not a synonym for DUI but a separate charge. Texas runs both: DWI turns on intoxication and the 0.08% limit at any age, while a driver under 21 can be charged with Driving Under the Influence of Alcohol by a Minor over any detectable amount at all, where the 0.08% figure simply does not apply.
Source: Texas Department of Public Safety, Alcohol Related Laws for Minors (DL-20), checked 2026-08-30
OWI — operating while intoxicated
The word that matters is “operating”, not “driving”. Wisconsin states plainly that a driver counts as operating while intoxicated even if the vehicle is not in motion at the time of the stop.
Source: Wisconsin DMV, Impaired driving (OWI) in Wisconsin, checked 2026-08-30
OVI — operating a vehicle under the influence
Ohio widened what counts as the thing you were operating. The statute reads “any vehicle, streetcar, or trackless trolley” — not “motor vehicle” — which is why an OVI does not require an engine.
Source: Ohio Revised Code 4511.19, checked 2026-08-30
OUI — operating under the influence
The Maine Bureau of Motor Vehicles runs the whole licensing consequence — suspension, the education program, the interlock — under the label OUI. Searching Maine records for “DUI” finds the wrong paperwork.
Source: Maine Bureau of Motor Vehicles, Operating Under the Influence Information, checked 2026-08-30
DWAI — driving while ability impaired
A lower rung, not a synonym. Colorado sets DWAI at 0.05% against 0.08% for DUI, and defines it as being affected to the slightest degree — less able to drive than you ordinarily would be. New York places DWAI between 0.05% and 0.07%, and treats a first one as a traffic infraction rather than a misdemeanor.
Source: Colorado State Patrol, DUI — Don’t Underestimate Impairment, checked 2026-08-30
DWI vs DUI, OWI vs DUI: what the difference is
What does DUI stand for, what does DWI stand for, and is one of them worse? In most states the comparison has no answer, because there is only one offense and the state simply chose one set of letters for it. The comparison only becomes real where a state runs both, and even then “worse” depends on which pair you are comparing.
Where the two coexist, the split is usually by degree or by age rather than by severity of driving. New York places driving while ability impaired below driving while intoxicated and treats a first one as a traffic infraction with a 90-day suspension, against a minimum six-month revocation for DWI. Colorado sets the lesser charge at 0.05% and defines it as being affected to the slightest degree. Texas divides by age instead.
The practical consequence is dull but expensive: an article about “DWI penalties” written for one state can describe a charge that does not exist in yours. Check the term your own state uses before you take any number seriously.
States that do not say “DUI”
If your paperwork uses different letters, this is why.
- DWI — Texas, New York, New Jersey, Minnesota, Missouri, North Carolina, Louisiana, Arkansas, New Hampshire
- OWI — Michigan, Wisconsin, Iowa, Indiana
- OUI — Maine, Massachusetts
- OVI — Ohio
- DUII — Oregon
Each state page gives the local term, the limit and the interlock rule with its source.
What counts as over the limit
A per se limit means the reading alone proves the offense — how you were driving stops mattering. Below the limit you can still be charged on observed impairment, which is the part most people miss.
| Who | Limit | What it means |
|---|---|---|
| Every state except Utah | 0.08% | The per se limit for drivers 21 and over: at or above it the number alone proves the offense, with no argument about how you were driving. source |
| Utah | 0.05% | Utah lowered its per se limit from 0.08% to 0.05% under House Bill 155, in force since 30 December 2018, and remains the only state at that level. source |
| Colorado, lesser charge | 0.05% | Colorado keeps DUI at 0.08% but charges DWAI from 0.05%, so the range between the two is not a safe zone — it is its own offense. source |
| New York, lesser charge | over 0.05% to 0.07% | DWAI sits below the 0.08% DWI line. A first DWAI is a traffic infraction with a 90-day suspension, against a minimum six-month revocation for DWI. source |
| Commercial drivers | 0.04% | Half the ordinary limit, and it applies while operating a commercial vehicle regardless of what the personal license allows. source |
| Drivers under 21 | any detectable amount, in most states | Zero-tolerance rules run alongside the adult limit. Wisconsin requires absolute sobriety under 21; New York and Colorado set the line at 0.02%. source |
A bike, a horse, a lawn mower
Tens of thousands of people a month ask whether this charge reaches things that are not cars. The honest answer is not a story about a man on a horse in Texas — it is one word in your state’s statute.
Statutes that say “vehicle”
Ohio prohibits operating “any vehicle, streetcar, or trackless trolley” under the influence. Nothing in that phrase requires an engine, which is what opens the door to charges on things that are not cars.
Source: Ohio Revised Code 4511.19, checked 2026-08-30
Statutes that say “motor vehicle”
Wisconsin frames the same offense around operating a motor vehicle. Where the statute is written that way, the answer to the bicycle question is different — and it is the wording, not local folklore, that decides it.
Source: Wisconsin DMV, Impaired driving (OWI) in Wisconsin, checked 2026-08-30
The same logic decides the other versions of the question — golf carts, mobility scooters, farm equipment. Look for whether the statute says vehicle or motor vehicle, then read what your state defines that term to include.
What happens when you get a DUI
Two processes start on the night of the arrest and run on separate calendars. Almost everyone notices the court case and misses the other one, which is the expensive mistake — the licensing deadline can pass while you are still waiting for a court date.
The administrative clock starts immediately
Separate from any criminal charge, the licensing agency in most states starts its own process to suspend your license. You normally have a short window — in some states as little as seven days — to request a hearing. Miss it and the suspension proceeds regardless of what happens in court. This deadline is the single most common thing people lose by waiting.
Your first court appearance
The arraignment is where the charge is read and a plea is entered. It is usually short. What matters is what has been prepared before it — whether the stop, the testing procedure and the calibration records have been examined.
Evidence and negotiation
Breath and blood testing depends on equipment being maintained and procedures being followed. Records of both are obtainable. Most cases resolve at this stage rather than at trial.
Resolution and what follows
Beyond any fine or jail exposure, a conviction usually brings an interlock requirement, higher insurance through an SR-22 filing, and a record that follows you. The license side and the criminal side are resolved separately, and finishing one does not finish the other.
Whether a DUI is a criminal offense depends on the state and on the degree: a first offense is a misdemeanor in most places, a lesser charge such as DWAI can be a traffic infraction, and repeat offenses or an injury turn it into a felony. Whichever it is, the licensing consequence arrives first and moves faster than the court.
Why the rules are written this tightly
Source: NHTSA Fatality Analysis Reporting System. Counts crashes where police recorded that a driver had been drinking, which is narrower than the federal 0.08 BAC measure and therefore understates the real figure.
What you probably came here to do
Your state, specifically
What the offense is called there, the reading that triggers the device, when it becomes a felony and how the state compares on crash records.
Find out what your state requires
Local term, the reading that triggers an interlock, how long it runs and which agency enforces it — with the state’s own source on every figure.
Work out the cost
Installation, the monthly fee, calibration and removal, using published state caps where they exist rather than a vendor’s quote.
See what it carries
When a charge becomes a felony, what aggravates it, and which jail terms a judge is not allowed to suspend.
Read the numbers
What BAC stands for, what each level does behind the wheel, and the one level at which safe driving is actually guaranteed.
Understand the test
What a breathalyzer measures, why nothing sobers you up faster than time, and what refusing the test costs in your state.
Add up the bill
Every line that appears after a conviction, and why the fine is the smallest of them.
The required classes
Which programs a court accepts, why a cheap online course may not count, and what a victim impact panel actually is.
Travel and work
Whether Canada will let you in, what it means for a commercial license, and what an employer sees.
Check your license
The official way to see whether it is suspended, what a restricted license allows, and the hearing deadline that runs on its own.
Check your record
How long it stays on the driving record, on the criminal one, and what an employer actually sees.
Get insured again
What an SR-22 actually is, how long your state makes you carry it, and why Florida asks for a different form entirely.
Talk to a lawyer
What an attorney does, what drives the fee, and the licensing deadline that runs whether or not you have hired one.
What the law says where you are
The offense has a different name, a different felony threshold and a different interlock rule in every state. Each page carries that state’s own figures with the source they came from.
Questions people actually type
What’s a DUI, in one sentence?
A criminal charge for operating a vehicle while alcohol or drugs have impaired your ability to do it safely, or while your blood alcohol concentration is at or above the state limit — 0.08% everywhere except Utah, where it is 0.05%. The letters change from state to state; the underlying conduct does not.
What’s a DWI?
Driving while intoxicated. In most states it is simply the local name for the same offense others call a DUI. In a few — Texas and New York among them — it is a distinct charge that sits alongside a lesser or age-based one, with its own limit and its own penalties.
What is the difference between a DUI and a DWI?
It depends entirely on the state. In most of them the two are different names for one offense, and which one appears on your paperwork is a matter of local drafting. In a handful they are separate charges: Texas prosecutes DWI on intoxication at any age, while a driver under 21 faces Driving Under the Influence of Alcohol by a Minor over any detectable amount. Reading a national article and assuming it describes your case is the mistake that costs people money.
What does OWI mean?
Operating while intoxicated. Wisconsin, Michigan and Iowa use it, and the important word is “operating” rather than “driving”: Wisconsin states outright that the offense applies even if the vehicle was not moving when you were stopped. Sitting in a parked car is not automatically a defense.
What does OVI mean?
Operating a vehicle under the influence, the term Ohio uses. Ohio Revised Code 4511.19 prohibits operating “any vehicle, streetcar, or trackless trolley” — the statute never says “motor vehicle”, which is why the Ohio version reaches further than most.
Can you get a DUI on a bicycle or a horse?
The answer is in one word of your state’s statute. Where the law says “vehicle”, as Ohio’s does, it does not require an engine. Where it says “motor vehicle”, as Wisconsin’s does, the analysis is different. Any answer that starts with “in America…” is guessing, because there is no national rule to apply.
What is the legal alcohol limit for driving?
0.08% in every state except Utah, which lowered its limit to 0.05% at the end of 2018 and remains the only one there. Below the limit you can still be charged if an officer documents impairment, and Colorado and New York both run a lesser charge that starts at 0.05%.
Does a DUI always mean an ignition interlock?
No, but it is the most common condition attached to getting your license back, and in many states a first offense above a certain reading triggers it automatically. The threshold, the length and who runs the program are all set state by state.
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.