Driving under the influence (DUI), driving while intoxicated (DWI), drunken driving, drink driving, drunk driving, operating under the influence, drinking and driving, or impaired driving is the crime of driving a motor vehicle with blood levels of alcohol in excess of a legal limit ("Blood Alcohol Concentration", or "BAC"). Similar regulations cover driving or operating certain types of machinery while affected by drinking alcohol or taking other drugs, including, but not limited to prescription drugs. This is a criminal offense in most nations. Convictions do not necessarily involve actual driving of the vehicle.
In most jurisdictions, a quantitative measurement such as a blood alcohol content (BAC) in excess of a specific threshold level, such as 0.05% or 0.08%, defines the offense with no need to prove impairment or intoxication. In some jurisdictions, there is an aggravated category of the offense at a higher BAC level, such as 0.12%. In most countries, anyone who is convicted of injuring or killing someone while under the influence of alcohol or drugs can be heavily fined, as in France, in addition to being given a lengthy prison sentence. Many employers or occupations have their own rules and BAC limits; for example, the United States Federal Railroad Administration has a 0.04% limit for train crew.Template:Dead link Certain large corporations have their own rules; for example, Union Pacific Railroad has their own BAC limit of 0.02% that, if violated during a random test or a for-cause test — for example, after a traffic accident — can result in termination of employment with no chance of future re-hire. Some jurisdictions have multiple levels of BAC for different categories of drivers; for example, the state of California has a general 0.08% BAC limit, a lower limit of 0.04% for commercial operators, and a limit of 0.01% for drivers who are under 21 or on probation for previous DUI offenses.
Many states in the U.S. and the Federal government of Canada have adopted truth in sentencing laws that enforce strict guidelines on sentencing, differing from previous practice where prison time was reduced or suspended after sentencing had been issued. Some jurisdictions have judicial guidelines requiring a mandatory minimum sentence. DUI convictions can result in multi-year jail terms and other penalties ranging from expensive fees to forfeiture of one's license plates and vehicle. Some jurisdictions require that drivers convicted of DUI offenses use special license plates that are easily distinguishable from regular plates. These plates are known in popular parlance as "party plates" or "whiskey plates".
The specific criminal offense may be called, depending on the jurisdiction, driving under the influence [of alcohol or other drugs] (DUI), driving under intense influence (DUII), driving while intoxicated (DWI), "operating vehicle under the influence of alcohol or drugs" (OVI), operating under the influence (OUI) operating while intoxicated (OWI), operating a motor vehicle while intoxicated (OMVI), driving under the combined influence of alcohol and/or other drugs, driving under the influence per se or drunk in charge [of a vehicle]. Many such laws apply also to motorcycling, boating, piloting aircraft, use of motile farm equipment such as tractors and combines, riding horses or driving a horse-drawn vehicle, or bicycling, possibly with different BAC level than driving. In some jurisdictions there are separate charges depending on the vehicle used, such as BWI (bicycling while intoxicated), which may carry a lighter sentence.
In the United States, local law enforcement agencies made 1,467,300 arrests nationwide for driving under the influence of alcohol in 1996, compared to 1.9 million such arrests during the peak year in 1983. In 1997 an estimated 513,200 DWI offenders were in prison or jail, down from 593,000 in 1990 and up from 270,100 in 1986.
- Canada: 0.05-0.08%
- France: 0.05% or 0.02% for bus drivers (€135 fine and 6 demerit points on the driver's license, which can be suspended for 3 years maximum), 0.08% (aggravated, criminal offense, license suspension for 3 years, €4500 fine, and up to 2 years imprisonment)
- Germany: None for beginners, 0.08% (Strict enforcement)
- Ireland: 0.05% generally or 0.02% for learner drivers, newly qualified drivers (those who have their license for less than two years) and professional drivers, and those who do not have their driving license on them when stopped by the Gardaí (police). Police do not need a reason to request a breath sample. Being convicted of drunk driving usually carries a 2-year ban as well as a €1500 fine.
- Malaysia: 0.05%
- Singapore: 0.08% or BrAC: 35 microgrammes of alcohol per 100 ml of breath, strictly enforced.
- United Kingdom: 80 mg of alcohol per 100ml of blood, 35 μg per 100ml of breath or 107 mg per 100ml of urine
- United States: 0.08% per UAC
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